Method and device for the filtering of responses in a secondary

Details Method and device for the filtering of responses in a secondary Method and device for the filtering of responses in a secondary

1993-06-29

1995-07-11

Sotomayor, John B.

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

Air traffic control

Secondary surveilance radar

342189, 342159, G01S 1374

Patent

active

054325170

ABSTRACT:
A method for the defruiting of the responses from radar transponders received by a secondary radar in response to interrogations sent by the radar recurrently, a recurrence being formed by the interrogation and the responses received during a listening period that follows the interrogation, the defruiting operation consisting in verifying that a response received at an instant T of the recurrence is correlated by the presence of at least r-1 other responses received at the same instant T of their recurrence, these responses forming part of a sequence of at least r recurrences including the current recurrence, the method being one wherein the correlation is achieved over several chosen sequences and wherein the correlation is declared to be positive if it is positive for one of the sequences.

REFERENCES:
patent: 3705402 (1972-12-01), Ballantyne et al.
patent: 3887916 (1975-06-01), Goyer
patent: 3913100 (1975-10-01), Janex
patent: 4896158 (1990-01-01), Cole, Jr.
patent: 4945550 (1990-07-01), Krause et al.
patent: 5001751 (1991-03-01), Sanford et al.
patent: 5126744 (1992-06-01), Goedeke et al.

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