A Multiangle MIMO-SAR Fusion Imaging Method Based on Improved Range Migration Algorithm and Improved Geographic Information Scale Invariant Feature Transform Algorithm

In order to resolve the conflict between high pulse repetition frequency (PRF) and wide-swath imaging in multi-angle synthetic aperture radar (SAR), a multi-angle imaging model combined with multiple-input multiple-output synthetic aperture radar (MIMO-SAR) is proposed. The model utilizes more freedom in azimuth degrees provided by MIMO-SAR to remove azimuth ambiguity caused by low PRF, and successfully solves that contradiction. At the same time, considering the problem of low utilization of spectrum in multi-angle imaging SAR, an improved range migration algorithm (ImRMA) is proposed, which can effectively increase the utilization of the spectrum for data processing. Finally, an improved method of geographic information-scale invariant feature transform (ImGI-SIFT) is used to achieve the efficiency fusion of multi-angle imaging results. Simulation and real data experiments show that the effectiveness and superiority of the proposed imaging method, and the precision of the proposed fusion method.