US4000491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scan simulator for secondary radar/IFF testing
Assignee: United States Department of the Navy
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Filing: 1975-05-28
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Granted: 1976-12-28
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Expires: 1995-05-28
Abstract
Abstract A reply simulator for generating binary 1's and 0's representative of "frd" and "non-friend" replies received by an IFF system. Simulated replies are produced in a probabilistic fashion which takes into account variation in a simulated received signal caused by simulated antenna pattern and antenna direction variations, as well as by the probability that a "non-friend" will produce a "friend" reply.
Inventors
- 👤 Walton B. Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:22
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4021; G01S13/00; G01S13/74; G01S13/76; G01S13/78; G01S7/4052; G01S7/4082
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A system for simulating IFF-type responses received by IFF-type decision devices from a simulated antenna azimuth pattern comprising: means for generating a binary representation, in the form of a series of binary numbers B, of a time-varying antenna pattern signal whereby said variation in time is related to the azimuthal variation desired to be simulated; and means for generating a corresponding random binary number Y for each said binary number B, for comparing said binary number B with said corresponding binary number Y, for generating a binary "0" when said binary number Y is equal to or larger than said corresponding binary number B, and for generating a binary "1" when said binary number Y is less than said corresponding binary number B.
Claim 2
Independent Claim
123 words
A system for simulating IFF-type responses received by IFF-type decision devices from a simulated antenna azimuth pattern comprising: means for generating a binary representation, in the form of a series of binary numbers B, of a time-varying antenna pattern signal whereby said variation in time is related to the azimuthal variation desired to be simulated; and means for generating a corresponding random binary number Y for each said binary number B, for comparing said binary number B with said corresponding binary number Y, for generating a binary "0" when said binary number Y is equal to or larger than said corresponding binary number B, and for generating a binary "1" when said binary number Y is less than said corresponding binary number B.
Claim 3
Dependent Claim
33 words
The IFF reply simulation system of claim 1 wherein said means for generating a binary representation includes means for generating a signal indicative of the simulated azimuth of the antenna pattern being simulated.
Claim 4
Independent Claim
106 words
A method for simulating IFF-type replies received by an IFF decision device as a function of antenna pattern variations comprising the steps of: generating a series of binary numbers B representative of variation in gain as a function of azimuth of an antenna pattern desired to be simulated; generating a corresponding random binary number Y for each binary number B; comparing each of said corresponding binary numbers B, Y; and generating a binary "0" when said binary number B is less than said corresponding binary number Y and generating a binary "1" when said binary number B is not less than said corresponding binary number Y.
Claim 5
Independent Claim
106 words
A method for simulating IFF-type replies received by an IFF decision device as a function of antenna pattern variations comprising the steps of: generating a series of binary numbers B representative of variation in gain as a function of azimuth of an antenna pattern desired to be simulated; generating a corresponding random binary number Y for each binary number B; comparing each of said corresponding binary numbers B, Y; and generating a binary "0" when said binary number B is less than said corresponding binary number Y and generating a binary "1" when said binary number B is not less than said corresponding binary number Y.
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |