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针对机载合成孔径雷达(SAR)高分辨率宽测绘带(HRWS)成像问题,在分析结合两步运动误差补偿的距离徙动算法基础上,提出一种基于数值计算的空变运动误差补偿算法。通过对粗聚焦图像进行分块,在子块的两维波数域进行空变运动补偿,补偿的相位包括方位相位误差、距离相位误差以及方位和距离的耦合相位,因此该算法在复杂航迹、高分辨和宽测绘带情况下仍具有较好的鲁棒性。最后对SAR仿真数据和实测数据进行处理,并与结合两步运动误差补偿的距离徙动算法进行比较,处理结果表明该算法能够更好地补偿空变运动误差。
Aiming at the problem of high resolution wideband (HRWS) imaging of airborne Synthetic Aperture Radar (SAR), based on the analysis of distance migration algorithm combined with two-step motion error compensation, a null-motion error compensation algorithm based on numerical computation . The coarsely focused image is divided into blocks and the space-time motion compensation is performed in the two-dimensional wave number domain of the subblock. The phase of the compensation includes the azimuth phase error, the phase error and the coupled phase of the azimuth and the distance. Therefore, High resolution and wide swath with still good robustness. Finally, the SAR simulation data and the measured data are processed and compared with the distance migration algorithm combined with two-step motion error compensation. The processing results show that the algorithm can better compensate for the motion error.