Apparatus for the observation and identification of helicopters

Details Apparatus for the observation and identification of helicopters Apparatus for the observation and identification of helicopters

G - Physics

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G01S 13/52 (2006.01) G01S 7/292 (2006.01) G01S 7/41 (2006.01) G01S 13/34 (2006.01) G01S 13/524 (2006.01)

Patent

CA 2080039

Abstract Apparatus for the observation and identification of helicopters by means of an FM-CW radar apparatus provided with transmitter means (1), antenna means (2) and receiver means (3). Blade flashes caused by the rotor blades are digitized by A/D converter (4) and processed by Fourier analysis means (5) and processor (6) in order to determine the range from a helicopter to the radar apparatus and the rotor symmetry characteristics. These symmetry characteristics, together with the blade flash repetition frequency yield a substantially unambiguous indication of the helicopter type. Fig. 2

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