Doppler radar for the detection and location of helicopters.

摘要

This doppler radar for the detection and location of helicopters, by virtue of the flashes of the blade operates in a band between 300 mhz and 20 ghz and the flashes of the blade by the width of the frequency spectrum and their duration. It is used for receiving a multilobe antenna associated with a plurality of parallel lines of the signal processor specialized in the detection of helicopters, enabling a detection on a broad range, and a precise location. Each chain comprises a phase detector amplitude dap (10, 10 ′), followed by a doppler filters vcm (20, 20 ') selecting the echoes at a wide frequency spectrum, of a circuit for calculating module (30, 30 ′), of a circuit of the contrast (40, 40 ′) eliminating the echoes which are too long, of a threshold circuit (50, 50 ′) and a circuit for the reduction of false alarm rfa (60, 60 ′) eliminating the echoes which are too short. The chains lead to a calculating circuit of the bearing (100) out of the delta measurements when it is possible.