Joint surveillance target attack system combat transponder

Details Joint surveillance target attack system combat transponder Joint surveillance target attack system combat transponder

1998-05-26

2000-06-27

Lobo, Ian J.

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

Radar transponder system

Iff or sif

342 44, G01S 1378, G01S 1374

Patent

active

060812222

ABSTRACT:
A radar transponder and transponder system is provided for providing transponder communications signals embedded within radar interrogation and reply signals. The radar interrogation signals include transponder interrogation signals embedded within the bandwidth thereof. The transponders include a receiver for extracting the transponder interrogation signal and an offset frequency generator for up-converting or down-converting the transponder interrogation signal while remaining within the bandwidth of the radar signal. The transponders may be selectively enabled in response to interrogation signals having particular frequencies and/or in accordance with preset date or time schedules. The transponder outputs may be phase coherent with the interrogation signals and generated less than 10 nsec after receipt of the transponder interrogation signal. As such, the transponder reply signals are difficult to distinguish from the radar interrogation/reply signals.

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