In the system of bistatic synthetic aperture radars(SARs),the range cell migration of the moving targets is increased significantly due to the complex data collection geometry,resulting in geometry distortion and smearing in the derived imagery.It is essential to compensate for the motion phase error of MTs.This paper derives the two-dimensional phase error of MTs in bistatic polar formatted imagery.Based on the obtained equation,an over-complete dictionary is built and the spectrum of bistatic imagery is viewed as a sparse representation of the dictionary.The sparse constraint is used to restrain the projection coefficients of the sparse representation and to promote the separation of clutter and refocus of MTs.Finally,the point target simulation verifies the effectiveness of the algorithm.
关键词
双基地合成孔径雷达/极坐标格式算法/稀疏表示/杂波抑制/动目标成像
Key words
bistatic SAR/polar format algorithm/sparse constraint/clutter suppression/moving targets refocus
维普
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