On suppressing azimuth ambiguities of synthetic aperture radar by three filters

Abstract

This paper proposes a method for suppressing the azimuth ambiguities of synthetic aperture radar (SAR). This method is based on the discrete time domain model of the echo signal. In addition to the usual matched filter used by image reconstruction of SAR, other two filters are used to get responses which have the same shapes as the responses of the first ambiguities. After the outputs of the latter two filters are subtracted from that of the matched filter, we can get a response nearly free of the first ambiguities. Simulation shows that this method is effective. This method is helpful in improving SAR image quality and relaxing the constraints of the pulse repetition frequency (PRF) in SAR system design.