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运动补偿是雷达平台机动飞行条件下合成孔径雷达(SAR)实现精确聚焦成像的前提,而如何精确实现运动误差的空变补偿(误差补偿随目标距离、方位和高度位置的变化而变化)目前还存在很大的挑战。本文提出了一种新的三阶运动补偿方法,能够有效解决复杂雷达航迹和地形起伏条件下运动误差的空变补偿问题。该方法首先以场景中心为参考进行空不变运动补偿,然后以多个子场景中心为参考进行空变运动补偿,最后再利用极坐标格式算法(PFA)统一补偿每个像素的空变误差。仿真数据处理结果验证了本文方法的有效性。
Motion compensation is the prerequisite for precise focus imaging of synthetic aperture radar (SAR) under the condition of maneuvering flight of radar platform, and how to accurately realize the space error compensation of motion error (error compensation changes with the change of target distance, azimuth and altitude) There is a big challenge. In this paper, a new third-order motion compensation method is proposed, which can effectively solve the problem of space-time compensation of motion error under complicated radar track and topography fluctuation. In this method, spatial invariant motion compensation is first performed with reference to the scene center. Then, motion-compensated motion compensation is performed based on a plurality of sub-scene centers. Finally, the free-space error of each pixel is compensated by the polar coordinate algorithm (PFA). Simulation results show that the proposed method is effective.