US5223837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-exploitation method and apparatus for controlling aircraft IFF
Assignee: United States Department of the Army
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Filing: 1981-11-12
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Granted: 1993-06-29
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Expires: 2001-11-12
Abstract
Abstract A method and apparatus for preventing unauthorized sources from utilizing rcraft-borne I.F.F. for locating same. A bypass switch is inserted in the I.F.F. transponder antenna line which normally sends all incoming signals into a dummy load. Upon receipt of a proper interrogate command, the antenna is switched to the transponder.
Inventors
- 👤 Sidney J. Grossman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:42
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/767; G01S7/00; G01S7/02; G01S7/021
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A method of preventing exploitation of IFF by unauthorized sources while still providing IFF to authorized sources comprising: monitoring relevant electromagnetic wavelength bands for transmissions; comparing IFF interrogate signals received to known electronic signature profiles which characterize their origin; generating an output characterizing whether a received IFF interrogate signal had acceptable origins, and; utilizing said output to control the operation of said IFF.
Claim 2
Independent Claim
63 words
A method of preventing exploitation of IFF by unauthorized sources while still providing IFF to authorized sources comprising: monitoring relevant electromagnetic wavelength bands for transmissions; comparing IFF interrogate signals received to known electronic signature profiles which characterize their origin; generating an output characterizing whether a received IFF interrogate signal had acceptable origins, and; utilizing said output to control the operation of said IFF.
Claim 3
Dependent Claim
20 words
The method of claim 1 further comprising; maintaining said IFF nonfunctional until receipt of an IFF interrogation from acceptable origins.
Claim 4
Dependent Claim
148 words
Apparatus for preventing exploitation of IFF by unauthorized sources while still providing IFF to authorized sources comprising: An IFF transponder system including IFF antenna, IFF signal transmission means, and an IFF transponder; Intercept receiver means for receiving and determining characteristics of received electromatic transmissions including an intercept antenna, intercept signal transmission means, intercept receiver logic circuit means for comparing intercepted transmissions to known electronic signature profiles and providing outputs indicative thereof, and display means for receiving said outputs and displaying outputs to an operator; said IFF signal transmission means further comprising: switch means including switch operator means and switch contacts responsive to said operator for selectively providing a signal path between said IFF antenna and said IFF transponder or between said IFF antenna and a dummy load; said switch operator means operatively receiving an output from said logic circuit means for controlling signal path selection of said contacts.
Claim 5
Dependent Claim
148 words
Apparatus for preventing exploitation of IFF by unauthorized sources while still providing IFF to authorized sources comprising: An IFF transponder system including IFF antenna, IFF signal transmission means, and an IFF transponder; Intercept receiver means for receiving and determining characteristics of received electromatic transmissions including an intercept antenna, intercept signal transmission means, intercept receiver logic circuit means for comparing intercepted transmissions to known electronic signature profiles and providing outputs indicative thereof, and display means for receiving said outputs and displaying outputs to an operator; said IFF signal transmission means further comprising: switch means including switch operator means and switch contacts responsive to said operator for selectively providing a signal path between said IFF antenna and said IFF transponder or between said IFF antenna and a dummy load; said switch operator means operatively receiving an output from said logic circuit means for controlling signal path selection of said contacts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |