Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1990-11-16
1992-01-14
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342192, G01S 1352
Patent
active
050814591
ABSTRACT:
This Doppler radar for the detection and localization of helicopters through blade flashes works in a band located between 300 MHz and 20 GHz and identifies the blade flashes by the width of their frequency spectrum and their duration. It uses, at reception, a multilobe antenna associated with several parallel signal processing chains specialized in the detection of helicopters, enabling detection over a widened zone as well as precise localization. Each chain has a phase amplitude detector PAD (10, 10') followed by a Doppler filter MTI (20, 20') selecting the wide frequency spectrum, a module computing circuit (30, 30'), a contrast circuit (40, 40') eliminating excessively long echoes, a threshold circuit (50, 50') and a false alarm reduction circuit FAR (60, 60') eliminating excessively short echoes. The chains lead to a relative bearing computation circuit (100) performing angle measurements when this is possible.
REFERENCES:
patent: 4038656 (1977-07-01), Webb, Jr. et al.
patent: 4275396 (1981-06-01), Jacomini
patent: 4308535 (1981-12-01), Guillerot et al.
patent: 4346382 (1982-08-01), Bosc et al.
patent: 4389647 (1983-06-01), Fanuele et al.
patent: 4573052 (1986-02-01), Guillerot et al.
Chanot Claude
de Grancey Patrick
Girou Thierry
Guillerot Jean-Claude
"Thomson-CSF"
Barron Jr. Gilberto
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