Identification, friend or foe IFF installation

Details Identification, friend or foe IFF installation Identification, friend or foe IFF installation

1980-10-14

1986-01-21

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 68LC, G01S 956, G01S 1374

Patent

active

045660093

ABSTRACT:
In an installation for identification friend or foe, coded interrogations and replies of an interrogation installation of the interrogating station and of a transponder of the interrogated station are transmitted in utilizing a radiotelephony installation. The transmission of the reply (identification) proceeds according to the frequency jumping procedure via the radiotelephony installation. The interrogation of the interrogating station consists of a known encoded code word and an encoded variable data part which contains (or comprises) a frequency address. The making available (or offering) of the transmit frequencies of the transponder proceeds by means of a frequency synthesizer controlled (or operated) by the frequency address. The reply is, in certain circumstances, repeated on several, successively transmitted frequencies.

REFERENCES:
patent: 3167772 (1965-01-01), Bagnall, Jr. et al.
patent: 3341845 (1967-09-01), Deman
patent: 3341846 (1967-09-01), McMurren et al.
patent: 3579235 (1971-05-01), Straub et al.
patent: 3750163 (1973-07-01), Hecker
patent: 3945006 (1976-03-01), Cleeton
patent: 3949397 (1976-04-01), Wagner et al.

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