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A modified phase gradient autofocus (PGA) method tailored for circular trace scanning synthetic aperture radar (CTSSAR) is provided in this paper to handle the motion compensation problem. In CTSSAR, the circular orbit makes the imaging and the motion compensation hard to perform, and the traditional algorithms cannot accomplish precise imaging. Different from the classical PGA method, the modified...
In order to obtain high-resolution wide-swath (HRWS) images, the multichannel in azimuth synthetic aperture radar (SAR) system has been adopted to deal with the contradiction problem between high resolution and low pulse repetition frequency (PRF). In this paper, a novel channel-calibration method is proposed for the multichannel in azimuth HRWS SAR imaging system. During the channel calibration,...
For a multi-channel in azimuth high-resolution and wide-swath SAR (HRWS) system, the range-variant channel mismatch in amplitude and phase deteriorates the coherence between different channels and the Doppler ambiguity suppression. In this paper, in order to improve the performance of multi-channel reconstruction in azimuth, the range-variant channel mismatch is compensated by coarse-compensation...
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