Radar receiver having clutter and large signal reduction

摘要

An improved radar receiver including coherent side-lobe cancellation in which a difference pattern is utilized in azimuth by the auxiliary antenna to reduce the clutter return signal on the auxiliary channel and to also cause the clutter signal to be decorrelated with the clutter received on the main antenna. The two effects of reducing the clutter return and the decorrelation considerably reduces the degradation in coherent side-lobe cancellation operation of jamming signals characteristically caused by clutter on the auxiliary channel over most of the surveillance volume. Also, by providing substantial attenuation of the large target return in the auxiliary channel by the null in the direction of the principle response of the main antenna, large target signal returns are unable to capture the coherent side-lobe canceller loops and inhibit the coherent cancellation of jamming signals.