Method and apparatus for interrogating and identifying fixed or

Details Method and apparatus for interrogating and identifying fixed or Method and apparatus for interrogating and identifying fixed or

1975-05-21

1977-03-29

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 956

Patent

active

040152596

ABSTRACT:
Hijacked vehicles, or the like, are identified by illuminating a transpon mounted to the vehicle by a beam of microwave energy, e.g., from a helicopter flying over the traffic. The transponder includes non-linear diodes which reradiate a signal back towards the helicopter. Means are disclosed for modulating the return signal with a 16-bit identification code, each bit of which is transmitted as a 31-bit pseudo-random code.

REFERENCES:
patent: 3341845 (1967-09-01), Deman
patent: 3631484 (1971-12-01), Augenbluk
patent: 3718926 (1973-02-01), Parker et al.
patent: 3721906 (1973-03-01), Geesen et al.
patent: 3754250 (1973-08-01), Bruner
patent: 3914762 (1975-10-01), Klensch

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