Moving target detection in HRWS mode

Due to the restriction of the number of receivers, it is hard to realize high-resolution wide-swath (HRWS) imaging and moving target detection simultaneously for multichannel synthetic aperture radar (SAR) systems. This paper presents a novel moving target detection method in HRWS mode. A digital beamforming (DBF) technique in azimuth time domain is proposed to convert the ambiguous multichannel SAR signals into unambiguous single channel SAR signals. Azimuth ambiguities of both stationary targets and moving targets can be effectively suppressed. Finally, moving targets can be successfully detected by traditional moving target detection methods for single channel SAR systems without adding receivers and changing SAR operating mode. Theoretical analysis and experiments showed the feasibility of the proposed method.