US5722059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver for use in a radio tracking system and a method of operation thereof
Assignee: NTP Inc
•
Filing: 1995-12-06
•
Granted: 1998-02-24
•
Expires: 2015-12-06
Abstract
Abstract A method and radio receiver for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver. Each frequency hopping radio frequency transmitter periodically transmits an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter. The synchronized frequency hopping radio frequency receiver determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculates an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes an average of the calculated integrals, compares the average of the calculated integrals to a numerical value representing the set range and generates an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Inventors
- 👤 Thomas J. Campana, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:51
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/20; G; G08; G08B; G08B21/00; G08B21/02; G08B21/0202; G08B21/0222; G08B21/0227; G08B21/023; G08B21/0241; G08B21/0247; G08B21/0263; H04B; H04B17/00; H04B17/10; H04B17/15; H04B17/18; H04B17/20; H04B17/23; H04B17/30; H04B17/309; H04B17/318; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/086; H04L1/004; H04L1/0045; H04L1/0072; H04L1/0056; H04L1/0057
Claims Analysis
Total Claims: 126
Claim 1
Independent Claim
263 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculatinq an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing an average of the calculated integrals which is updated to include newly calculated integrals only when each newly calculated integral differs from the computed average of the calculated integrals by less than a function of the average of the calculated integrals so as to exclude from the computation of the average of the calculated integrals newly calculated integrals which differ from the average of the calculated integrals by more than the function, comparing the average of the calculated integrals to a numerical value representing the set range and qenerating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 2
Independent Claim
263 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculatinq an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing an average of the calculated integrals which is updated to include newly calculated integrals only when each newly calculated integral differs from the computed average of the calculated integrals by less than a function of the average of the calculated integrals so as to exclude from the computation of the average of the calculated integrals newly calculated integrals which differ from the average of the calculated integrals by more than the function, comparing the average of the calculated integrals to a numerical value representing the set range and qenerating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 3
Dependent Claim
282 words
A method in accordance with claim 1 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radlo frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 4
Dependent Claim
296 words
A method in accordance with claim 1 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one frequency hopping radio frequency transmitter which contains at least part of the digits of the identification code of the one frequency hopping radio frequency transmitter and an alert which signals to a user of the synchronized frequency hopping radio frequency receiver that the user of the frequency hopping one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one frequency hopping radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the alert was transmitted and in response to the synchronized frequency hopping radio frequency receiver being moved by a user the synchronized frequency hopping radio frequency receiver displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of the radio frequency carrier from the frequency hopping radio frequency transmitter from which the alert was received to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the frequency hopping radio frequency transmitter transmitting the alert, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which transmitted the alert is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 5
Dependent Claim
38 words
A method in accordance with claim 1 wherein: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, produces each received signal strength indicator.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 4 wherein: the amplifier is an intermediate frequency amplifier.
Claim 7
Independent Claim
205 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculating an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing an average of the calculated integrals which is updated to include newly calculated integrals, comparing the average of the calculated integrals to a numerical value representing the set range and generating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 8
Independent Claim
205 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculating an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing an average of the calculated integrals which is updated to include newly calculated integrals, comparing the average of the calculated integrals to a numerical value representing the set range and generating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 9
Dependent Claim
282 words
A method in accordance with claim 6 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 10
Dependent Claim
296 words
A method in accordance with claim 6 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one frequency hopping radio frequency transmitter which contains at least part of the digits of the identification code of the one frequency hopping radio frequency transmitter and an alert which signals to a user of the synchronized frequency hopping radio frequency receiver that the user of the frequency hopping one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one frequency hopping radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the alert was transmitted and in response to the synchronized frequency hopping radio frequency receiver being moved by a user the synchronized frequency hopping radio frequency receiver displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of the radio frequency carrier from the frequency hopping radio frequency transmitter from which the alert was received to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the frequency hopping radio frequency transmitter transmitting the alert, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which transmitted the alert is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 11
Dependent Claim
38 words
A method in accordance with claim 6 wherein: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, produces each received signal strength indicator.
Claim 12
Dependent Claim
15 words
A method in accordance with claim 9 wherein: the amplifier is an intermediate frequency amplifier.
Claim 13
Independent Claim
195 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, producing a received signal strength indicator of each radio frequency carrier determined to contain at least part of the bits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing an average of the received signal strength indicators, comparing the average of the received signal strength indicators to a value representing the set range and generating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 14
Independent Claim
195 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, producing a received signal strength indicator of each radio frequency carrier determined to contain at least part of the bits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing an average of the received signal strength indicators, comparing the average of the received signal strength indicators to a value representing the set range and generating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 15
Dependent Claim
282 words
A method in accordance with claim 11 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 16
Dependent Claim
296 words
A method in accordance with claim 11 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one frequency hopping radio frequency transmitter which contains at least part of the digits of the identification code of the one frequency hopping radio frequency transmitter and an alert which signals to a user of the synchronized frequency hopping radio frequency receiver that the user of the frequency hopping one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one frequency hopping radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the alert was transmitted and in response to the synchronized frequency hopping radio frequency receiver being moved by a user the synchronized frequency hopping radio frequency receiver displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of the radio frequency carrier from the frequency hopping radio frequency transmitter from which the alert was received to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the frequency hopping radio frequency transmitter transmitting the alert, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which transmitted the alert is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 17
Dependent Claim
38 words
A method in accordance with claim 11 wherein: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, produces each received signal strength indicator.
Claim 18
Dependent Claim
15 words
A method in accordance with claim 14 wherein: the amplifier is an intermediate frequency amplifier.
Claim 19
Dependent Claim
314 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculates an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes an average of the calculated integrals which is updated to include newly calculated integrals only when each newly calculated integral differs from the computed average of the calculated integrals by less than a function of the average of the calculated integrals so as to exclude from the computation of the average of the calculated integrals newly calculated integrals which differ from the average of the calculated integrals by more than the function, compares the average of the calculated integrals to a value representing the set range and generates an alert when the comparison reveals that the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 20
Dependent Claim
314 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculates an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes an average of the calculated integrals which is updated to include newly calculated integrals only when each newly calculated integral differs from the computed average of the calculated integrals by less than a function of the average of the calculated integrals so as to exclude from the computation of the average of the calculated integrals newly calculated integrals which differ from the average of the calculated integrals by more than the function, compares the average of the calculated integrals to a value representing the set range and generates an alert when the comparison reveals that the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 21
Dependent Claim
286 words
A frequency hopping radio frequency receiver in accordance with claim 16 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 22
Dependent Claim
300 words
A frequency hopping radio frequency receiver in accordance with claim 16 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one frequency hopping radio frequency transmitter which contains at least part of the digits of the identification code of the one frequency hopping radio frequency transmitter and an alert which signals to a user of the synchronized frequency hopping radio frequency receiver that the user of the frequency hopping one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one frequency hopping radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the alert was transmitted and in response to the synchronized frequency hopping radio frequency receiver being moved by a user the synchronized frequency hopping radio frequency receiver displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of the radio frequency carrier from the frequency hopping radio frequency transmitter from which the alert was received to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the frequency hopping radio frequency transmitter transmitting the alert, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which transmitted the alert is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 23
Dependent Claim
43 words
A frequency hopping radio receiver in accordance with claim 16 further comprising: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, for producing each received signal strength indicator.
Claim 24
Dependent Claim
19 words
A frequency hopping radio frequency receiver in accordance with claim 19 wherein: the amplifier is an intermediate frequency amplifier.
Claim 25
Dependent Claim
261 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identify each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculates an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes an average of the calculated integrals which is updated to include newly calculated integrals, compares the average of the calculated integrals to a numerical value representing the set range and generates an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 26
Dependent Claim
261 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identify each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, calculates an integral of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes an average of the calculated integrals which is updated to include newly calculated integrals, compares the average of the calculated integrals to a numerical value representing the set range and generates an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 27
Dependent Claim
284 words
A radio frequency receiver in accordance with claim 21 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hofromg radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 28
Dependent Claim
298 words
A radio frequency receiver in accordance with claim 21 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one frequency hopping radio frequency transmitter which contains at least part of the digits of the identification code of the one frequency hopping radio frequency transmitter and an alert which signals to a user of the synchronized frequency hopping radio frequency receiver that the user of the frequency hopping one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one frequency hopping radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the alert was transmitted and in response to the synchronized frequency hopping radio frequency receiver being moved by a user the synchronized frequency hopping radio frequency receiver displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of the radio frequency carrier from the frequency hopping radio frequency transmitter from which the alert was received to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the frequency hopping radio frequency transmitter transmitting the alert, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which transmitted the alert is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 29
Dependent Claim
43 words
A frequency hopping radio receiver in accordance with claim 21 further comprising: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, for producing each received signal strength indicator.
Claim 30
Dependent Claim
19 words
A frequency hopping radio frequency receiver in accordance with claim 21 wherein: the amplifier is an intermediate frequency amplifier.
Claim 31
Dependent Claim
254 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, produces a received signal strength indicator of each radio frequency carrier determined to contain at least part of the diqits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes an average of the received signal strength indicators, compares the average of the received signal strength indicators to a numerical value representing the set range and generates an alert when a comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 32
Dependent Claim
254 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, produces a received signal strength indicator of each radio frequency carrier determined to contain at least part of the diqits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes an average of the received signal strength indicators, compares the average of the received signal strength indicators to a numerical value representing the set range and generates an alert when a comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 33
Dependent Claim
286 words
A frequency hopping radio frequency receiver in accordance with claim 26 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 34
Dependent Claim
300 words
A frequency hopping radio frequency receiver in accordance with claim 26 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one frequency hopping radio frequency transmitter which contains at least part of the digits of the identification code of the one frequency hopping radio frequency transmitter and an alert which signals to a user of the synchronized frequency hopping radio frequency receiver that the user of the frequency hopping one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one frequency hopping radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the alert was transmitted and in response to the synchronized frequency hopping radio frequency receiver being moved by a user the synchronized frequency hopping radio frequency receiver displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of the radio frequency carrier from the frequency hopping radio frequency transmitter from which the alert was received to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the frequency hopping radio frequency transmitter transmitting the alert, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which transmitted the alert is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 35
Dependent Claim
43 words
A frequency hopping radio receiver in accordance with claim 26 further comprising: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, for producing each received signal strength indicator.
Claim 36
Dependent Claim
19 words
A frequency hopping radio frequency receiver in accordance with claim 29 wherein: the amplifier is an intermediate frequency amplifier.
Claim 37
Independent Claim
203 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, producing a function of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing a function in response to at least one function of the received signal strength indicator, comparing the computed function to a numerical value representing the set range and generating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 38
Independent Claim
203 words
A method for determining where at least one frequency hopping radio frequency transmitter is located with respect to a set range measured from a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: in response to receiving each radio frequency carrier, determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, producing a function of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computing a function in response to at least one function of the received signal strength indicator, comparing the computed function to a numerical value representing the set range and generating an alert when the comparison reveals that at least one of the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 39
Dependent Claim
282 words
A method in accordance with claim 31 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 40
Dependent Claim
277 words
A method in accordance with claim 31 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 41
Dependent Claim
38 words
A method in accordance with claim 31 wherein: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, produces each received signal strength indicator.
Claim 42
Dependent Claim
15 words
A method in accordance with claim 34 wherein: the amplifier is an intermediate frequency amplifier.
Claim 43
Dependent Claim
25 words
A method in accordance with claim 34 wherein: the computed function is responsive to a plurality of produced functions of the received signal strength indicator.
Claim 44
Dependent Claim
25 words
A method in accordance with claim 31 wherein: the computed function is responsive to a plurality of produced functions of the received signal strength indicator.
Claim 45
Dependent Claim
253 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, produces a function of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes a function in response to at least one function of the received signal indicator, compares the computed function to a value representing the set range and generates an alert when the comparison reveals that the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 46
Dependent Claim
253 words
A frequency hopping radio frequency receiver for determining where at least one frequency hopping radio frequency transmitter is located after synchronization between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter with respect to a set range measured from the synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits which identifies each frequency hopping radio frequency transmitter with a radio frequency carrier modulated with a subcarrier with the subcarrier being modulated with the identification code comprising: the frequency hopping radio frequency receiver having a processor, the processor in response to receiving each radio frequency carrier controls synchronization of frequency hopping between the frequency hopping radio frequency receiver and the at least one frequency hopping radio frequency transmitter, determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, produces a function of a received signal strength indicator of each radio frequency carrier determined to contain at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter, computes a function in response to at least one function of the received signal indicator, compares the computed function to a value representing the set range and generates an alert when the comparison reveals that the at least one frequency hopping radio frequency transmitter is outside the set range.
Claim 47
Dependent Claim
285 words
A frequency hopping radio receiver in accordance with claim 38 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each frequency hopping radio frequency transmitter which is used to compute the average of the calculated integrals; and after generation of the alert using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the identification codes were transmitted which caused generation of the alert and in response to the synchronized frequency hopping radio frequency receiver being moved by a user, displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of transmissions of the radio frequency carrier containing at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted which caused the synchronized frequency hopping radio frequency receiver to generate the alert to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier containing the at least part of the digits of the identification code of the frequency hopping radio frequency transmitter from which the identification code was transmitted to generate the alert is received, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which is outside of the set range is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 48
Dependent Claim
300 words
A frequency hopping radio receiver method in accordance with claim 38 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one frequency hopping radio frequency transmitter which contains at least part of the digits of the identification code of the one frequency hopping radio frequency transmitter and an alert which signals to a user of the synchronized frequency hopping radio frequency receiver that the user of the frequency hopping one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one frequency hopping radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier containing at least part of the digits of the identification code identifying the frequency hopping radio frequency transmitter from which the alert was transmitted and in response to the synchronized frequency hopping radio frequency receiver being moved by a user the synchronized frequency hopping radio frequency receiver displaying a magnitude of the integral of each successively received signal strength indicator generated in response to reception of the radio frequency carrier from the frequency hopping radio frequency transmitter from which the alert was received to permit a user of the synchronized frequency hopping radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the frequency hopping radio frequency transmitter transmitting the alert, producing a maximum magnitude of the integral of each successively received signal strength indicator relative to the synchronized frequency hopping radio frequency receiver whereby a direction of the frequency hopping radio frequency transmitter which transmitted the alert is determined by the user of the synchronized frequency hopping radio frequency receiver relative to the synchronized frequency hopping radio frequency receiver.
Claim 49
Dependent Claim
43 words
A frequency hopping radio receiver in accordance with claim 38 further comprising: an amplifier, responsive to each radio carrier modulated with the subcarrier containing the identification of one of the at least one radio frequency transmitter, for producing each received signal strength indicator.
Claim 50
Dependent Claim
19 words
A frequency hopping radio frequency receiver in accordance with claim 41 wherein: the amplifier is an intermediate frequency amplifier.
Claim 51
Dependent Claim
29 words
A frequency hopping radio frequency receiver in accordance with claim 41 wherein: the computed function is responsive to a plurality of produced functions of the received signal strength indicator.
Claim 52
Dependent Claim
29 words
A frequency hopping radio frequency receiver in accordance with claim 38 wherein: the computed function is responsive to a plurality of produced functions of the received signal strength indicator.
Claim 53
Independent Claim
125 words
A method for determining where at least one radio frequency transmitter is located with respect to a set range from a radio frequency receiver with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio frequency carrier comprising: producing a first function of a signal produced in response to each received radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function, comparing the second function to a value representing the set range and generating an alert when the comparison reveals that at least one of the at least one radio frequency transmitter is outside the set range.
Claim 54
Independent Claim
125 words
A method for determining where at least one radio frequency transmitter is located with respect to a set range from a radio frequency receiver with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio frequency carrier comprising: producing a first function of a signal produced in response to each received radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function, comparing the second function to a value representing the set range and generating an alert when the comparison reveals that at least one of the at least one radio frequency transmitter is outside the set range.
Claim 55
Dependent Claim
177 words
A method in accordance with claim 45 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by each radio frequency transmitter; and after generation of the alert using a directional antenna to receive transmissions of the identification code, transmitted with the radio frequency carrier, identifying the radio frequency transmitter from which the identification code was transmitted which caused the generation of the alert and in response to the radio frequency receiver being moved by a user the radio frequency receiver displaying in response to the second function a magnitude display to permit a user of the radio frequency receiver to locate a direction, from which a radio frequency carrier transmitted with the identification code of the radio frequency transmitter which generated the alert is received, producing a maximum magnitude display in response to the second function relative to the radio frequency receiver whereby a direction of the radio frequency transmitter which is outside of the set range is determined by the user of the radio frequency receiver relative to the radio frequency receiver.
Claim 56
Dependent Claim
20 words
A method in accordance with claim 46 wherein: the second function is responsive to a plurality of the first functions.
Claim 57
Dependent Claim
223 words
A method in accordance with claim 45 further comprising: using an omnidirectional antenna to receive the radio frequency carrier transmitted by one of the at least one radio frequency transmitter with the identification code of the one radio frequency transmitter and an alert which signals to a user of the radio frequency receiver that the user of the one radio frequency transmitter is transmitting a change in status of the user; and in response to reception of the alert from one of the at least one radio frequency transmitter using a directional antenna to receive transmissions of the radio frequency carrier transmitted with the identification code identifying the radio frequency transmitter from which the alert was transmitted and in response to the radio frequency receiver being moved by a user the radio frequency receiver displaying, in response to the second function a magnitude display to permit a user of the radio frequency receiver to locate a direction, from which a radio frequency carrier with the identification code is received from the radio frequency transmitter which transmitted the alert, producing a maximum magnitude display in response to the second function relative to the radio frequency receiver whereby a direction of the radio frequency transmitter which transmitted the alert is determined by the user of the radio frequency receiver relative to the radio frequency receiver.
Claim 58
Dependent Claim
20 words
A method in accordance with claim 48 wherein: the second function is responsive to a plurality of the first functions.
Claim 59
Dependent Claim
105 words
A method in accordance with claim 45 wherein: the radio frequency carrier is modulated with a subcarrier; and the subcarrier is modulated with at least one identification frame group, each identification frame group comprising a plurality of frames with at least one of the plurality of frames of the identification frame group containing bits encoding the identification code, a plurality of bits of error correction code in each frame, synchronization information for synchronizing a clock of the radio frequency receiver, and a command field for encoding the alert transmitted to the radio frequency receiver from the user of the radio frequency transmitter transmitting the alert.
Claim 60
Dependent Claim
155 words
A method in accordance with claim 50 wherein: the subcarrier has cycles which are modulated with bits encoding the identification code with each cycle of the subcarrier being modulated with bits at a plurality of separated angular positions; and for each received radio frequency carrier processing detected individual cycles of the subcarrier to calculate an integral of at least one selected modulated part of each of the individual cycles, numerically comparing each of the calculated integrals with a plurality of stored numerical ranges which ranges each represent one of a plurality of possible numerical values that the selected part may encode to identify a stored range numerically including the calculated integral, substituting for the at least one selected part of each of the cycles the one of the plurality of numerical values representative of the identified stored range including the calculated integral with each numerical value encoding one bit and decoding a plurality of bits.
Claim 61
Dependent Claim
20 words
A method in accordance with claim 51 wherein: the second function is responsive to a plurality of the first functions.
Claim 62
Dependent Claim
20 words
A method in accordance with claim 50 wherein: the second function is responsive to a plurality of the first functions.
Claim 63
Dependent Claim
20 words
A method in accordance with claim 45 wherein: the second function is responsive to a plurality of the first functions.
Claim 64
Dependent Claim
132 words
A radio frequency receiver for determining where at least one radio frequency transmitter is located with respect to a set range from the radio frequency receiver with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio common carrier comprising: a processor, the processor producing a first function of a signal produced in response to each received radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function, comparing the second function to a numerical value representing the set range and generating an alert when a comparison reveals that at least one of the at least one radio frequency transmitter is outside the set range.
Claim 65
Dependent Claim
132 words
A radio frequency receiver for determining where at least one radio frequency transmitter is located with respect to a set range from the radio frequency receiver with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio common carrier comprising: a processor, the processor producing a first function of a signal produced in response to each received radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function, comparing the second function to a numerical value representing the set range and generating an alert when a comparison reveals that at least one of the at least one radio frequency transmitter is outside the set range.
Claim 66
Dependent Claim
181 words
A radio frequency receiver in accordance with claim 55 further comprising: an omnidirectional antenna, the omnidirectional antenna receiving the radio frequency carrier transmitted by each radio frequency transmitter; and a directional antenna, the directional antenna after generation of the alert receives transmissions of the identification code, transmitted with the radio frequency carrier, identifying the radio frequency transmitter from which the identification code was transmitted which caused the radio frequency receiver to generate the alert and in response to the radio frequency receiver being moved by a user the processor in response to the second function controlling a magnitude display to permit a user of the radio frequency receiver to locate a direction, from which a radio frequency carrier transmitted with the identification code of the radio frequency transmitter generated the alert is received, producing a maximum magnitude display in response to the second function relative to the radio frequency receiver whereby a direction of the radio frequency transmitter which is outside of the set range is determined by the user of the radio frequency receiver relative to the radio frequency receiver.
Claim 67
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 56 wherein: the second function is responsive to a plurality of the first functions.
Claim 68
Dependent Claim
220 words
A radio frequency receiver in accordance with claim 55 further comprising: an omnidirectional antenna, the omnidirectional antenna receiving the radio frequency carrier transmitted by one of the at least one radio frequency transmitter with the identification code of the one radio frequency transmitter and an alert which signals to a user of the radio frequency receiver that the user of the one radio frequency transmitter is transmitting a change in status of the user; and a directional antenna, the directional antenna in response to reception of the alert from one of the at least one radio frequency transmitter receives transmissions of the radio frequency carrier transmitted with the identification code identifying the radio frequency transmitter from which the alert was transmitted and in response to the radio frequency receiver being moved by a user, the processor in response to the second function controlling a magnitude display to permit a user of the radio frequency receiver to locate a direction, from which a radio frequency carrier is received from the radio frequency transmitter transmitting the alert, producing a maximum magnitude display in response to the second function relative to the radio frequency receiver whereby a direction of the radio frequency transmitter which transmitted the alert is determined by the user of the radio frequency receiver relative to the radio frequency receiver.
Claim 69
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 58 wherein: the second function is responsive to a plurality of the first functions.
Claim 70
Dependent Claim
107 words
A radio frequency receiver in accordance with claim 55 wherein: the radio frequency subcarrier is modulated with a subcarrier; and the subcarrier is modulated with at least one identification frame group, each identification frame group comprising a plurality of frames with at least one of the plurality of frames of the identification frame group containing bits encoding the identification code, a plurality of bits of error correction code in each frame, synchronization information for synchronizing a clock of the radio frequency receiver, and a command field for encoding the alert transmitted to the radio frequency receiver from the user of the radio frequency transmitter transmitting the alert.
Claim 71
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 60 wherein: the second function is responsive to a plurality of the first functions.
Claim 72
Dependent Claim
159 words
A radio frequency receiver in accordance with claim 60 wherein: the subcarrier has cycles which are modulated with bits encoding the identification code with each cycle of the subcarrier being modulated with bits at a plurality of separated angular positions; and for each received radio frequency carrier, the processor processes detected individual cycles of the subcarrier to calculate an integral of at least one selected modulated part of each of the individual cycles, numerically compares each of the calculated integrals with a plurality of stored numerical ranges which ranges each represent one of a plurality of possible numerical values that the selected part may encode to identify a stored range numerically including the calculated integral, substitutes for the at least one selected part of each of the cycles the one of the plurality of numerical values representative of the identified stored range including the calculated integral with each numerical value encoding one bit and decodes a plurality of bits.
Claim 73
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 62 wherein: the second function is responsive to a plurality of the first functions.
Claim 74
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 55 wherein: the second function is responsive to a plurality of the first functions.
Claim 75
Independent Claim
143 words
A method of use of at least one radio frequency transmitter with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio frequency carrier comprising: producing with a radio receiver a first function of a signal produced in response to reception of each radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function and in response to the second function either determining if one of the at least one radio frequency transmitter is outside of a set range between the one of the at least one radio frequency transmitter and the radio frequency receiver or determining a direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 76
Independent Claim
143 words
A method of use of at least one radio frequency transmitter with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio frequency carrier comprising: producing with a radio receiver a first function of a signal produced in response to reception of each radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function and in response to the second function either determining if one of the at least one radio frequency transmitter is outside of a set range between the one of the at least one radio frequency transmitter and the radio frequency receiver or determining a direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 77
Dependent Claim
105 words
A method in accordance with claim 65 wherein: the radio frequency carrier is modulated with a subcarrier; and the subcarrier is modulated with at least one identification frame group, each identification frame group comprising a plurality of frames with at least one of the plurality of frames of the identification frame group containing bits encoding the identification code, a plurality of bits of error correction code in each frame, synchronization information for synchronizing a clock of the radio frequency receiver, and a command field for encoding the alert transmitted to the radio frequency receiver from the user of the radio frequency transmitter transmitting the alert.
Claim 78
Dependent Claim
20 words
A method in accordance with claim 66 wherein: the second function is responsive to a plurality of the first functions.
Claim 79
Dependent Claim
91 words
A method in accordance with claim 67 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 80
Dependent Claim
155 words
A method in accordance with claim 66 wherein: the subcarrier has cycles which are modulated with bits encoding the identification code with each cycle of the subcarrier being modulated with bits at a plurality of separated angular positions; and for each received radio frequency carrier processing detected individual cycles of the subcarrier to calculate an integral of at least one selected modulated part of each of the individual cycles, numerically comparing each of the calculated integrals with a plurality of stored numerical ranges which ranges each represent one of a plurality of possible numerical values that the selected part may encode to identify a stored range numerically including the calculated integral, substituting for the at least one selected part of each of the cycles the one of the plurality of numerical values representative of the identified stored range including the calculated integral with each numerical value encoding one bit and decoding a plurality of bits.
Claim 81
Dependent Claim
20 words
A method in accordance with claim 69 wherein: the second function is responsive to a plurality of the first functions.
Claim 82
Dependent Claim
91 words
A method in accordance with claim 70 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 83
Dependent Claim
91 words
A method in accordance with claim 69 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 84
Dependent Claim
91 words
A method in accordance with claim 66 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 85
Dependent Claim
20 words
A method in accordance with claim 65 wherein: the second function is responsive to a plurality of the first functions.
Claim 86
Dependent Claim
91 words
A method in accordance with claim 74 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 87
Dependent Claim
91 words
A method in accordance with claim 65 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 88
Dependent Claim
144 words
A radio frequency receiver for use with at least one radio frequency transmitter with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio frequency carrier comprising: a processor, the processor producing a first function of a signal produced in response to each received radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function, and in response to the second function either determining if one of the at least one radio frequency transmitter is outside of a set range between the one of the at least one radio frequency transmitter and the radio frequency receiver or determining a direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 89
Dependent Claim
144 words
A radio frequency receiver for use with at least one radio frequency transmitter with each radio frequency transmitter periodically transmitting an identification code which identifies each radio frequency transmitter with a radio frequency carrier comprising: a processor, the processor producing a first function of a signal produced in response to each received radio frequency carrier transmitted with the identification code of one of the at least one radio frequency transmitter, producing a second function in response to at least one first function, and in response to the second function either determining if one of the at least one radio frequency transmitter is outside of a set range between the one of the at least one radio frequency transmitter and the radio frequency receiver or determining a direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 90
Dependent Claim
108 words
A radio frequency receiver in accordance with claim 77 further comprising: the radio frequency subcarrier is modulated with a subcarrier; and the subcarrier is modulated with at least one identification frame group, each identification frame group comprising a plurality of frames with at least one of the plurality of frames of the identification frame group containing bits encoding the identification code, a plurality of bits of error correction code in each frame, synchronization information for synchronizing a clock of the radio frequency receiver, and a command field for encoding the alert transmitted to the radio frequency receiver from the user of the radio frequency transmitter transmitting the alert.
Claim 91
Dependent Claim
171 words
A radio frequency receiver in accordance with claim 78 wherein: the subcarrier has cycles which are modulated with bits encoding the identification code of the radio frequency transmitter which transmitted the received radio frequency carrier with each cycle of the subcarrier being modulated with bits at a plurality of separated angular positions; and for each received radio frequency carrier the processor processes detected individual cycles of the subcarrier to calculate an integral of at least one selected modulated part of each of the individual cycles, numerically compares each of the calculated integrals with a plurality of stored numerical ranges which ranges each represent one of a plurality of possible numerical values that the selected part may encode to identify a stored range numerically including the calculated integral, substitutes for the at least one selected part of each of the cycles the one of the plurality of numerical values representative of the identified stored range including the calculated integral with each numerical value encoding one bit and decodes a plurality of bits.
Claim 92
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 79 wherein: the second function is responsive to a plurality of the first functions.
Claim 93
Dependent Claim
93 words
A radio frequency receiver in accordance with claim 79 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 94
Dependent Claim
93 words
A radio frequency receiver in accordance with claim 80 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 95
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 78 wherein: the second function is responsive to a plurality of the first functions.
Claim 96
Dependent Claim
93 words
A radio frequency receiver in accordance with claim 83 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 97
Dependent Claim
93 words
A radio frequency receiver in accordance with claim 78 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 98
Dependent Claim
22 words
A radio frequency receiver in accordance with claim 77 wherein: the second function is responsive to a plurality of the first functions.
Claim 99
Dependent Claim
93 words
A radio frequency receiver in accordance with claim 86 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 100
Dependent Claim
93 words
A radio frequency receiver in accordance with claim 77 wherein: the receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one radio frequency transmitter relative to the radio frequency receiver.
Claim 101
Independent Claim
219 words
A method of use of at least one frequency hopping radio frequency transmitter in radio communication with a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits with a radio frequency carrier which identifies each radio frequency transmitter to the frequency hopping radio frequency receiver comprising: in response to receiving each radio frequency carrier determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, producing a first function of a signal produced in response to reception of each radio frequency carrier transmitted with at least part of the digits of identification code of one of the at least one frequency hopping radio frequency transmitter, producing a second function in response to at least one first function and in response to the second function either determining if one of the at least one frequency hopping radio frequency transmitter is outside of a set range between the one of the at least one frequency hopping radio frequency transmitter and the frequency hopping radio frequency receiver or determining a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 102
Independent Claim
219 words
A method of use of at least one frequency hopping radio frequency transmitter in radio communication with a synchronized frequency hopping radio frequency receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits with a radio frequency carrier which identifies each radio frequency transmitter to the frequency hopping radio frequency receiver comprising: in response to receiving each radio frequency carrier determining if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, producing a first function of a signal produced in response to reception of each radio frequency carrier transmitted with at least part of the digits of identification code of one of the at least one frequency hopping radio frequency transmitter, producing a second function in response to at least one first function and in response to the second function either determining if one of the at least one frequency hopping radio frequency transmitter is outside of a set range between the one of the at least one frequency hopping radio frequency transmitter and the frequency hopping radio frequency receiver or determining a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 103
Dependent Claim
111 words
A method in accordance with claim 89 wherein: the radio frequency carrier is modulated with a subcarrier; and the subcarrier is modulated with at least one identification frame group, each identification frame group comprising a plurality of frames with at least one of the plurality of frames of the identification frame group containing bits encoding the identification code, a plurality of bits of error correction code in each frame, synchronization information for synchronizing a clock of the frequency hopping radio frequency receiver, and a command field for encoding the alert transmitted to the frequency hopping radio frequency receiver from the user of the frequency hopping radio frequency transmitter transmitting the alert.
Claim 104
Dependent Claim
155 words
A method in accordance with claim 90 wherein: the subcarrier has cycles which are modulated with bits encoding the identification code with each cycle of the subcarrier being modulated with bits at a plurality of separated angular positions; and for each received radio frequency carrier processing detected individual cycles of the subcarrier to calculate an integral of at least one selected modulated part of each of the individual cycles, numerically comparing each of the calculated integrals with a plurality of stored numerical ranges which ranges each represent one of a plurality of possible numerical values that the selected part may encode to identify a stored range numerically including the calculated integral, substituting for the at least one selected part of each of the cycles the one of the plurality of numerical values representative of the identified stored range including the calculated integral with each numerical value encoding one bit and decoding a plurality of bits.
Claim 105
Dependent Claim
20 words
A method in accordance with claim 91 wherein: the second function is responsive to a plurality of the first functions.
Claim 106
Dependent Claim
100 words
A method in accordance with claim 91 wherein: the frequency hopping radio receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 107
Dependent Claim
20 words
A method in accordance with claim 90 wherein: the second function is responsive to a plurality of the first functions.
Claim 108
Dependent Claim
100 words
A method in accordance with claim 92 wherein: the frequency hopping radio receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 109
Dependent Claim
100 words
A method in accordance with claim 94 wherein: the frequency hopping radio receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 110
Dependent Claim
100 words
A method in accordance with claim 90 wherein: the frequency hopping radio receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 111
Dependent Claim
20 words
A method in accordance with claim 89 wherein: the second function is responsive to a plurality of the first functions.
Claim 112
Dependent Claim
100 words
A method in accordance with claim 98 wherein: the frequency hopping radio receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 113
Dependent Claim
100 words
A method in accordance with claim 89 wherein: the frequency hopping radio receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 114
Dependent Claim
223 words
A frequency hopping radio frequency receiver for use with at least one frequency hopping radio frequency transmitter synchronized by radio communication with the radio frequency frequency hopping receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits with a radio frequency carrier which identifies each radio frequency transmitter to the frequency hopping radio frequency receiver comprising: a processor, the processor in response to receiving each radio frequency carrier determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, produces a first function of a signal produced in response to each received radio frequency carrier transmitted with at least part of the digits of the identification code of one of the at least one radio frequency transmitter, produces a second function in response to at least one first function, and in response to the second function either determines if one of the at least one frequency hopping radio frequency transmitter is outside of a set range between the one of the at least one radio frequency transmitter and the frequency hopping radio frequency receiver or determines a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 115
Dependent Claim
223 words
A frequency hopping radio frequency receiver for use with at least one frequency hopping radio frequency transmitter synchronized by radio communication with the radio frequency frequency hopping receiver with each frequency hopping radio frequency transmitter periodically transmitting an identification code containing a plurality of digits with a radio frequency carrier which identifies each radio frequency transmitter to the frequency hopping radio frequency receiver comprising: a processor, the processor in response to receiving each radio frequency carrier determines if at least part of the digits of the identification code of one of the at least one frequency hopping radio frequency transmitter is contained therein, produces a first function of a signal produced in response to each received radio frequency carrier transmitted with at least part of the digits of the identification code of one of the at least one radio frequency transmitter, produces a second function in response to at least one first function, and in response to the second function either determines if one of the at least one frequency hopping radio frequency transmitter is outside of a set range between the one of the at least one radio frequency transmitter and the frequency hopping radio frequency receiver or determines a direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 116
Dependent Claim
116 words
A frequency hopping radio frequency receiver in accordance with claim 101 further comprising: the radio frequency subcarrier is modulated with a subcarrier; and the subcarrier is modulated with at least one identification frame group, each identification frame group comprising a plurality of frames with at least one of the plurality of frames of the identification frame group containing bits encoding the identification code, a plurality of bits of error correction code in each frame, synchronization information for synchronizing a clock of the frequency hopping radio frequency receiver, and a command field for encoding the alert transmitted to the frequency hopping radio frequency receiver from the user of the frequency hopping radio frequency transmitter transmitting the alert.
Claim 117
Dependent Claim
161 words
A frequency hopping radio frequency receiver in accordance with claim 102 wherein: the subcarrier has cycles which are modulated with bits encoding the identification code with each cycle of the subcarrier being modulated with bits at a plurality of separated angular positions; and for each received radio frequency carrier, the processor processes detected individual cycles of the subcarrier to calculate an integral of at least one selected modulated part of each of the individual cycles, numerically compares each of the calculated integrals with a plurality of stored numerical ranges which ranges each represent one of a plurality of possible numerical values that the selected part may encode to identify a stored range numerically including the calculated integral, substitutes for the at least one selected part of each of the cycles the one of the plurality of numerical values representative of the identified stored range including the calculated integral with each numerical value encoding one bit and decodes a plurality of bits.
Claim 118
Dependent Claim
24 words
A frequency hopping radio frequency receiver in accordance with claim 103 wherein: the second function is responsive to a plurality of the first functions.
Claim 119
Dependent Claim
101 words
A radio frequency receiver in accordance with claim 103 wherein: the frequency hopping receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 120
Dependent Claim
101 words
A radio frequency receiver in accordance with claim 104 wherein: the frequency hopping receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 121
Dependent Claim
24 words
A frequency hopping radio frequency receiver in accordance with claim 102 wherein: the second function is responsive to a plurality of the first functions.
Claim 122
Dependent Claim
101 words
A radio frequency receiver in accordance with claim 107 wherein: the frequency hopping receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 123
Dependent Claim
101 words
A radio frequency receiver in accordance with claim 102 wherein: the frequency hopping receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 124
Dependent Claim
24 words
A frequency hopping radio frequency receiver in accordance with claim 101 wherein: the second function is responsive to a plurality of the first functions.
Claim 125
Dependent Claim
101 words
A radio frequency receiver in accordance with claim 110 wherein: the frequency hopping receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
Claim 126
Dependent Claim
103 words
A frequency hopping radio frequency receiver in accordance with claim 101 wherein: the frequency hopping receiver comprises an antenna providing selective omnidirectional and directional reception of the radio frequency carrier; and the reception of the antenna is selectable so that omnidirectional reception is selected when a determination is made if one of the at least one frequency hopping radio frequency transmitter is outside of the set range and so that directional reception is selected when a determination is made of the direction of the one of the at least one frequency hopping radio frequency transmitter relative to the frequency hopping radio frequency receiver.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-23 | 2001-08-25 | 2002-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-23 | 2005-08-25 | 2006-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-23 | 2009-08-25 | 2010-02-24 | $7700.00 | Window Closed / Lapsed |