Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Combined with primary radar system
Patent
1970-06-01
1993-06-29
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Combined with primary radar system
342 6, 342 45, G01S 1387
Patent
active
052238393
ABSTRACT:
An improved passive IFF system operating as a supplement to a conventional adar system including a coded variable delay system to produce like time-coded variable phase delayed identifying signal components indicative of cooperating or friendly objects and which overlap signals of other reflecting echo signals from the objects. The IFF system is provided with a retro-directive type antenna. The overlapping cooperating or friendly signal components and the corresponding other echo reflecting object signals are simultaneously detected at the radar system which is provided with a compensating or complementary phase delay means time coded in the same manner as the identifying IFF signal components. The identifying IFF signal components are thus produced in uniform phase and are summed up to provide a signal at the radar system whose magnitude is relatively large as compared to the combined corresponding echo reflecting signals which are in random-phase relationship. The receiver is provided with an indicator to distinguish between the inphase-identifying signal components and the random-phase corresponding echo reflector signals.
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Anderson William H.
The United States of America as represented by the Secretary of
Tubbesing T. H.
Zelenka Michael
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