Beacon fruit filter

Details Beacon fruit filter Beacon fruit filter

1988-11-03

1990-01-23

Tarcza, Thomas H.

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

Air traffic control

Secondary surveilance radar

G01S 1378

Patent

active

048961582

ABSTRACT:
A method and apparatus for prefiltering received target and fruit replies to filter out more obvious occurrences of fruit replies in an air traffic control system. A detector detects reply signals occurring during sweeps of a radar. After each sweep of the radar, the sweep interval is scanned for the occurrences of reply signals. If a received reply is repeated in any of a predetermined number of successive sweep intervals, then standard sequential observer detection is performed on a larger predetermined number of beam sweeps. If, however, the received reply is not repeated in any of the beam sweeps of the first window, then the signal is considered to be a fruit signal and is discarded.

REFERENCES:
patent: 3258772 (1966-06-01), Humpherys
patent: 3302197 (1967-01-01), Humpherys
patent: 3514707 (1970-05-01), Campanaro et al.
patent: 3900848 (1975-08-01), Mears

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