REJECTION DE FOUILLIS DANS UN RECEPTEUR RADAR PASSIF DE SIGNAUX OFDM

摘要

The invention concerns a passive radar receiver for a received orthogonal frequency division multiplex-type signal consisting of symbol frames each transmitted on coded orthogonal carriers. After formatting the received signals into digital symbols (S1 SI), a filtering circuit (2) eliminates by subtraction or using a covariance matrix, in the symbol signal at least spurious signals with null Doppler effect so as to apply a filtered signal (X') containing essentially signals backscattered by mobile targets to a Doppler-distance correlator (4). Fig. 5: 12 RECEIVER 13 ESTIMATING TRANSMISSION AND CHANNEL PARAMETERS 14 TRUNCATURE: BASEBAND SIGNALS 21 FFT ANALYSER 22 SUBTRACTOR 3 CORRELATED SIGNAL DETECTOR 23 FFT<-1 >SYNTHESIZER 5 REPLY ESTIMATOR 41 DOPPLER-DISTANCE CORRELATION 42 ANGULAR FOCUSING 43 CONSTANT FALSE ALARM PROCESSING A PASSIVE RADAR RECEIVER B SPECTRUM C SYNCHRONISATION