Identification - friend or foe system and method

Details Identification - friend or foe system and method Identification - friend or foe system and method

1974-10-21

1976-04-06

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 68R, 343 18E, G01S 736, G01S 956

Patent

active

039493970

ABSTRACT:
Identification -- friend or foe systems which utilize computer control continuously changing interrogation signals and responding signals have been developed. The signals are varied in a time dependent manner, however, it is possible that an intruder might intercept a proper responding signal and repeat the code of this responding signal, and thus confuse the interrogating station. The present system allows a responding signal to be used only once during a particular time interval so that an interrogating station will know that if an otherwise proper responding signal is received twice during a time interval, that the second signal is spurious.

REFERENCES:
patent: 3218642 (1965-11-01), Newhouse et al.
patent: 3646556 (1972-02-01), Bishop
patent: 3680090 (1972-07-01), Bishop
patent: 3720945 (1973-03-01), Chow et al.
patent: 3725935 (1973-04-01), Alpers
patent: 3750163 (1973-07-01), Hecker

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