Joint surveillance target attack system combat transponder
First Claim
1. A radar transponder system comprising:
- a) a transmitter for transmitting wideband radar signals, said radar signals including transponder interrogation signals programmably embedded within the bandwidth of the radar signals, said interrogation signals being transmitted during transmission of said radar signals;
b) multiple remotely located transponders, each mountable on a movable object, said transponders including;
i) a receiver for receiving said radar signals and selectively extracting the transponder interrogation signals therefrom;
ii) an offset frequency generator for generating a variable frequency offset signal, said offset signal being adjustable within the bandwidth of said radar signals;
iii) a combiner for generating a combiner output in response to said extracted transponder interrogation signals and said variable frequency offset signal;
iv) a transponder transmitter circuit in electrical communication with said combiner for transmitting a transponder reply signal, responsive to the combiner output signal, within the bandwidth of said radar signals, both said interrogation and said reply signals being within the bandwidth of said radar signals, and being transmitted during said transmission of said radar signals, to facilitate low detection of said interrogation and said reply signals.
2 Assignments
0 Petitions
Accused Products
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.
35 Citations
33 Claims
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1. A radar transponder system comprising:
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a) a transmitter for transmitting wideband radar signals, said radar signals including transponder interrogation signals programmably embedded within the bandwidth of the radar signals, said interrogation signals being transmitted during transmission of said radar signals; b) multiple remotely located transponders, each mountable on a movable object, said transponders including; i) a receiver for receiving said radar signals and selectively extracting the transponder interrogation signals therefrom; ii) an offset frequency generator for generating a variable frequency offset signal, said offset signal being adjustable within the bandwidth of said radar signals; iii) a combiner for generating a combiner output in response to said extracted transponder interrogation signals and said variable frequency offset signal; iv) a transponder transmitter circuit in electrical communication with said combiner for transmitting a transponder reply signal, responsive to the combiner output signal, within the bandwidth of said radar signals, both said interrogation and said reply signals being within the bandwidth of said radar signals, and being transmitted during said transmission of said radar signals, to facilitate low detection of said interrogation and said reply signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radar transponder mountable on a movable object, said transponder comprising:
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a) a receiver for receiving radar interrogation signals and selectively extracting a transponder interrogation signal therefrom, said transponder interrogation signal being embedded within the bandwidth of said radar interrogation signals; b) an offset frequency generator for generating a variable frequency offset signal, said offset signal being adjustable within the bandwidth of said radar signals; c) a combiner for generating a combiner output signal in response to said transponder interrogation signal and said variable frequency offset signal; d) a transponder transmitter circuit in electrical communication with said combiner and for transmitting a transponder reply signal, responsive to the combiner output signal, within the bandwidth of said radar interrogation signals, both said interrogation and said reply signals being within the bandwidth of said radar signals, and being transmitted during said transmission of said radar signals, to facilitate low detection of said interrogation and said reply signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A low detectable radar transponder system communicating in identical normal operating band radar signals, the system comprising:
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a) a transmitter, the transmitter being operative to transmit wideband radar signals having transponder interrogation signals programmably embedded within, the interrogation signals being transmitted during transmission of the radar signals; b) multiple remotely located transponders, the transponders being operative to receive the radar signals and selectively extract the transponder interrogations signals therefrom; and c) the transponders further being operative to transmit transponder reply signals in response to the transponder interrogation signals, the transponder reply signals being within the bandwidth of he radar signals, both the interrogation and the reply signals being within the bandwidth of said radar signals, and being transmitted during the transmission of the radar signals, to facilitate low detection of the interrogation and the reply signals. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification