Remote identification device

Details Remote identification device Remote identification device

1985-02-19

1987-09-15

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Iff or sif

342 51, 342 6, G01S 1378

Patent

active

046942971

ABSTRACT:
The conventional way of achieving an identification, friend or foe (IFF) function for a moveable subject requires the subject to carry a transponder that emits a coded return when a radar pulse is received by its receiver. In the present invention, an IFF system is disclosed which departs from the conventional transponder method and employs no radio-frequency power source. Instead, it uses the scattering or reflecting properties of an antenna to modulate, in a distinctive manner, the radar return from a moveable subject. A binary sequence code generator modulates the impedance of a receiver antenna, with the reflected signal being detected and correlated with a synchronized code sequence at the radar.

REFERENCES:
patent: 3004253 (1961-10-01), Wilson
patent: 3689885 (1972-09-01), Kaplan et al.
patent: 3750163 (1973-07-01), Hecker
patent: 3945006 (1976-03-01), Cleeton
patent: 4114151 (1978-09-01), Denne et al.
patent: 4167007 (1979-09-01), McGeoch et al.
patent: 4364049 (1982-12-01), Moore et al.
patent: 4513285 (1985-04-01), Pike et al.

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