Method for the discriminating of obstacles by means of radar, an

Communications: directive radio wave systems and devices (e.g. – With particular circuit – With polarization

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342124, 342129, G01S 1346

Patent

active

054205913

ABSTRACT:
Disclosed is a method for the discriminating of obstacles by means of a radar, and its different applications to the measurement of a liquid in a tank or vessel, or again to the elimination of unwanted or parasitic echos coming notably from the ground, for radars mounted on vehicles or controlling vehicle traffic. To implement the method, the obstacle to be discriminated must have a substantially plane surface. The disclosed method then consists in successively transmitting substantially plane waves at slightly different angular frequencies .omega..sub.i, each wave being furthermore sent with two different polarizations p and p' chosen in such a way that these different coefficients of reflection on the obstacles according to the incidence of the waves give a criterion of discrimination. The processing at reception depends on the use (measurement of distance, elimination of parasitic echos etc.). The main promising feature of the invention lies in the fact that it is possible to make very precise measurements without placing excessive constraints on the transmission pattern of the radar.

REFERENCES:
patent: 3781889 (1973-12-01), Mitchell
patent: 3945005 (1976-03-01), Dunn
patent: 4107678 (1978-08-01), Powell
patent: 4231037 (1980-10-01), Long
patent: 4660044 (1987-04-01), Lavelle
Stammler et al., "Radar Signal Processing for Traffic Control", Proc. of Eusipco-88 4th European Signal Proc. Conf., vol. 2, 8 Sep. 1988, France, pp. 791-794.

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