基于级数反演的俯冲加速运动状态弹载SAR成像算法

Imaging algorithm for missile-borne SAR with diving acceleration based on series reversion

根据弹载合成孔径雷达(synthetic aperture radar,SAR)俯冲加速运动的特点,使用高阶逼近模型建立了SAR的回波信号模型,分析了目标斜距在单个孔径时间内随时间的变化关系。结合级数反演的思想,推导出了弹载SAR回波信号的二维频域的精确表达式。在此基础上,提出了一种适用于俯冲加速运动下的弹载SAR成像算法。理论分析和实验结果表明,该算法精度较高,取得了较好的成像效果。

In the missile-borne SAR working mode,there will be a strong coupling between range signal and azimuth signal. The echo model of the missile-borne SAR is established by using a fourth order range model, and the two-dimensional point target spectrum is derived by the method of series reversion, followed the corresponding range and azimuth match filtering functions are provided for motion compensation. The point target simulation results are presented to demonstrate the accuracy and validity of the proposed algorithm.