A Wide-Swath Imaging Method for the MIMO Bistatic SAR System

Existing imaging methods about Bistatic SAR(BiSAR) mostly consider small scene with single channel and ignore the negative effects of range ambiguity. In order to address this problem, a wide-swath imaging method based on multiple-input multiple-output(MIMO) BiSAR system is proposed in this paper. Firstly, the element pulse coding(EPC) MIMO BiSAR model is established by modulating both of elements and pulses. After that, the spatial filtering technique is utilized to separate signals from different range regions. Then, the Doppler preprocessing that based on the prior configuration information is performed to eliminate the Doppler centroid ambiguity. Finally, classical imaging method is performed, and the wide-swath imaging results can be obtained. Numerical simulations verify the proposed method.