US3894348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relator simulator system
Assignee: United States Department of the Navy
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Filing: 1966-12-19
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Granted: 1975-07-15
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Expires: 1986-12-19
Abstract
Abstract A system for simulating the relator feature of antisubmarine warfare sonar equipment wherein the operator is enabled to match a bearing line on a Codargram with the corresponding frequency line selected from the Lofargram for target signals in a low frequency range and set into a dial, the relator simulator system comprising a three cycle gate generator for generating gating signals of a width corresponding to three cycles of a dialed frequency, audio generator means for producing the dialed frequency, and audio gate means, the three cycle gate signals being operative to enable pulses from Lofar simulation to control the audio generator means to produce the selected frequency irrespective of inaccuracies in setting the dial, and the audio gate means being responsive to the presence of simulated target signals to pass the audio signals from the generator means to Codar simulation means.
Inventors
- 👤 Robert R Fontaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:23
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
313 words
In simulation apparatus including Lofar simulation means for producing pulses characteristic of simulated target signals, Codar simulation means including a pair delay shaft positionable in response to an input for producing signals simulating outputs of Codar sonobouy pairs, and signal data recorder means connected by spectrum analyzer means to said Lofar simulation means and connected by signal comparator means to said Codar simulation means so that said apparatus can be selectively operated to produce graphic presentations of simulated target signal frequencies, target bearings, relation of target frequency to target bearing, said apparatus further including dial means for manually selecting a target signal frequency from the graphic presentation of frequencies as an input to the apparatus; the improvement comprising: a relator simulator system connected to receive said Lofar simulation pulses, synchronizing pulses from said spectrum analyzer, and an oscillator signal from local oscillator means tuned by setting of said dial means to provide a local oscillator frequency; said relator system being operative to provide audio signals corresponding to said simulated target signal frequencies irrespective of inaccuracies in setting of said dial means, said relator system being connected to said Codar simulation means for providing said audio signals thereto whereby said recorder means can provide graphic presentation of the relation of a selected frequency to the simulated target from which the frequency emanated; said relator simulator system comprising a three cycle gate generator for generating gating signals of a width corresponding to three cycleS of a dialed frequency; audio generator means for producing said dialed frequency; and audio gate means; said three cycle gate signals being operative to enable said pulses from said Lofar simulation means to control said audio generator means to produce the selected frequency; and said audio gate means being responsive to the presence of simulated target signals to pass the audio signals from said generator means to said Codar simulation means.
Claim 2
Dependent Claim
313 words
In simulation apparatus including Lofar simulation means for producing pulses characteristic of simulated target signals, Codar simulation means including a pair delay shaft positionable in response to an input for producing signals simulating outputs of Codar sonobouy pairs, and signal data recorder means connected by spectrum analyzer means to said Lofar simulation means and connected by signal comparator means to said Codar simulation means so that said apparatus can be selectively operated to produce graphic presentations of simulated target signal frequencies, target bearings, relation of target frequency to target bearing, said apparatus further including dial means for manually selecting a target signal frequency from the graphic presentation of frequencies as an input to the apparatus; the improvement comprising: a relator simulator system connected to receive said Lofar simulation pulses, synchronizing pulses from said spectrum analyzer, and an oscillator signal from local oscillator means tuned by setting of said dial means to provide a local oscillator frequency; said relator system being operative to provide audio signals corresponding to said simulated target signal frequencies irrespective of inaccuracies in setting of said dial means, said relator system being connected to said Codar simulation means for providing said audio signals thereto whereby said recorder means can provide graphic presentation of the relation of a selected frequency to the simulated target from which the frequency emanated; said relator simulator system comprising a three cycle gate generator for generating gating signals of a width corresponding to three cycleS of a dialed frequency; audio generator means for producing said dialed frequency; and audio gate means; said three cycle gate signals being operative to enable said pulses from said Lofar simulation means to control said audio generator means to produce the selected frequency; and said audio gate means being responsive to the presence of simulated target signals to pass the audio signals from said generator means to said Codar simulation means.
Claim 3
Dependent Claim
174 words
Apparatus as defined in claim 1 and wherein said three cycle gate means comprises: second oscillator means for providing signals of a predetermined frequency, mixer means connected to said local oscillator means and to said second oscillator means and operative to provide signals at a frequency proportional to the dialed frequency; AND gate means connected to said mixer, said AND gate means being adapted to receive a timing signal and signals from said mixer and being operative to pass said signals at a frequency proportional to said dialed frequency for a predetermined time period; up-down binary counter means connected to said AND gate means so as to be loaded during said time period at a count rate proportional to the dialed frequency; second AND gate means for producing said three cycle gate signal in response to loading of a predetermined portion of said binary counter means; and storage register means connected to another portion of said binary counter for storing a count corresponding to said signals at a frequency proportional to said dialed frequency.
Claim 4
Dependent Claim
134 words
Apparatus as defined in claim 2 and wherein said audio generator means comprises: third oscillator means for providing signals of a fixed frequency; variable frequency divider means connected to said third oscillator means for dividing said fixed frequency by a factor varied in response to the count present in said storage register to provide a sine wave output; third AND gate means responsive to target signals from said Lofar simulation means and to said three cycle gate signals to provide frequency present signals indicative of the presence in said target signals of a frequency corresponding to the dialed frequency and within the width of said three cycle gate signal; said storage register being responsive to said freguency present signals from said third AND gate means to effect control of said variable frequency divider means.
Claim 5
Dependent Claim
68 words
Apparatus as defined in claim 3 and: a fixed frequency divider connected to said local oscillator and operative to provide a frequency proportional to the local oscillator frequency; a mixer connected to said variable frequency divider and to said fixed frequency divider and operative to combine the outputs thereof to provide an audio output signal of a frequency corresponding to the dialed frequency present in said target signals.
Claim 6
Dependent Claim
138 words
Apparatus as defined in claim 4 and wherein said audio gate means comprises: fourth AND gate means connected to said Lofar simulation means and to said third AND gate means and operable to provide an output upon coincidence of said target signals and said frequency present signals; holding circuit means operable in response to the output of said fourth AND gate means to provide an output which varies with the amplitude of said target signals; a variable gain amplifier connected to said holding circuit means and to said audio generator for amplifying said sine wave output thereof in response to the output of said holding circuit means; the output of said variable gain amplifier being connected to be the pair delay shaft input of said Codar simulation means for utilization in relating said target frequencies to target bearings.
Claim 7
Dependent Claim
110 words
Apparatus as defined in claim 5 and wherein said audio gate means further comprises: NOR gate means connected to said fourth AND gate means to provide an output when the output of said fourth AND gate is absent; relay means; detector means connected to said NOR gate and responsive to the output thereof to activate said relay means; said relay means having normally open contact means connected between the output of said variable gain amplifier means and ground, whereby closing of said contacts in response to absence of target signal input to said fourth AND gate will shut off output of said variable gain amplifier to said pair delay shaft.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |