Parallel observer spatial evaluator

Details Parallel observer spatial evaluator Parallel observer spatial evaluator

1993-09-17

1994-11-22

Sotomayor, John B.

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

Air traffic control

Secondary surveilance radar

342 40, 342 45, 342 46, G01S 1374, G01S 1378

Patent

active

053673034

ABSTRACT:
A method and means for evaluating transponder reply signals in a secondary radar system to differentiate valid replies from false replies. Transponder reply signals received by the interrogating radar are decoded to establish conformity with an established format. All decoded replies to a succession of N interrogation signals are stored in their order of reception in an array of N shift registers. A reply filter is associated with each of the N shift registers. The reply filters operate in parallel to scan the stages of each associated shift register. A unary adder provides the number M of replies detected by the reply filters at each scan step. Reply decision means selects a threshold value that is dependent upon operating conditions of the radar and generates a valid reply signal whenever the value M equals or exceeds the selected threshold value.

REFERENCES:
patent: 3801980 (1974-04-01), Danton et al.
patent: 4075631 (1978-02-01), Dumez
patent: 5001751 (1991-03-01), Sanford et al.
patent: 5089822 (1992-02-01), Abaunza et al.

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