Secondary surveillance radar

Details Secondary surveillance radar Secondary surveillance radar

1980-07-30

1982-06-08

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 16M, G01S 1378, G01S 1344

Patent

active

043342248

ABSTRACT:
A secondary surveillance radar is arranged to monitor the relative amplitudes of sum signals and difference signals received from a target in response to interrogations. Only those replies for which the sum signal exceeds the difference signal by a predetermined amplitude are accepted as valid to avoid degradation of the performance of the radar due to "punch through". "Punch through" stems from distortions in the radiation pattern of the radar and is often caused by reflections of the radar signals by large objects. A directional receiving antenna generates sum (.SIGMA.) and difference (.DELTA.) signals, and replies are accepted as valid and gated to an output only if a quantity log .DELTA./.SIGMA. exceeds a reference when compared at a comparator.

REFERENCES:
patent: 3283322 (1966-11-01), Hovda et al.
patent: 3349402 (1967-10-01), Foster
patent: 3427621 (1969-02-01), Brunner
patent: 4100544 (1978-07-01), Keeran

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