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首先,分析了大斜视下小孔径SAR回波距离徙动的特点,其距离走动的影响远大于距离弯曲,可忽略距离弯曲和距离展开的高次项;然后,提出一种基于Keystone变换和秩亏Capon法改进的距离多普勒成像法。利用Keystone变换进行距离走动校正,可避开斜视角精确测试的难题。针对较少的方位向采样数据,利用非对角加载的秩亏Capon法进行方位脉压,可提高方位分辨率,获得高效的SAR成像。
Firstly, the characteristics of migration distance of SAR with small aperture under large strabismus are analyzed, and the effect of walking distance is much greater than that of distance bending and ignorable distance bending and distance expansion. Then, a new algorithm based on Keystone transform and rank Improvement of distance Doppler imaging by loss Capon method. Using Keystone Transform for walking distance correction avoids the challenge of accurate testing of squint angles. For less azimuth sampling data, azimuth pulse compression using non-diagonal loading rank-deficient Capon method can improve the azimuth resolution and obtain highly efficient SAR imaging.