中文摘要：

弹载合成孔径雷达在子孔径信号处理时，由于运动的复杂性和距离方位的强耦合，增加了成像处理的难度。针对这一问题，该文分析了该成像体制下的距离徙动特性并引入二次调频函数进行统一距离徙动校正；在方位向处理上则通过频域投影补偿调频率空变。与传统算法相比，新算法可对子孔径回波进行更有效的成像与聚焦，仿真结果证明了算法的正确性和有效性。

英文摘要：

In the missile borne subaperture SAR mode, the complicate motion of the platform and the strong coupling between range and azimuth present substantial difficulty for echo data processing. To solve this problem, the range migration characteristics of the echo are analyzed and a secondary frequency function is introduced for uniform migration correction. During the azimuth processing, the azimuth frequency domain projection is applied to compensating the Doppler frequency modulation variation. Compared with the traditional algorithm, this proposed algorithm can focus the echo more effectively. Simulation results show the correctness and validity of the proposed algorithm.