Study on a Novel High-resolution and Wide-Swath SAR System with Mixed Baseline

The conventional single channel synthetic aperture radar (SAR) system cannot achieve High-Resolution and Wide-Swath (HRWS) images at the same time. Combined with digital beamforming (DBF), azimuth multiple channel systems can overcome such constraints. However, most of the available systems only consider the along-track baseline, while the cross-track baseline is treated as negligible. With the development and requirement of future SAR systems, the cross-track baseline will be involved and its effect on HRWS imaging cannot be ignored. In this paper, the HRWS multi-channel SAR system with the along-track and cross-track baselines (i.e., the mixed baseline) is studied. A novel imaging method is proposed to solve the problem caused by the cross-track, which can perform range registration on different receiving channels, and compensate for the spatial-variant phase errors. The simulation experiments verify the effectiveness of the proposed method.