本文分析了ChirpScaling算法推导过程中残留三次相位误差对成像质量的影响 ,在此基础上提出了一种基于非线性FM滤波的高分辨星载SAR成像处理SC ChirpScaling算法 .该算法采用斜视等效距离模型 ,利用非线性FM滤波方法实现了ChirpScaling算法的三次相位误差修正 ,使高分辨率星载SAR成像质量获得明显改善 .计算机仿真结果验证了该算法的有效性 . In this paper, we analyze the influence of the residual phase error of the third phase ChirpScaling algorithm on the imaging quality, and then propose an SC Chirp Scaling algorithm based on nonlinear FM filtering for high resolution spaceborne SAR imaging. The algorithm uses the strabismic equivalent distance Model, the cubic phase error correction of ChirpScaling algorithm is realized by nonlinear FM filtering method, and the imaging quality of high-resolution spaceborne SAR is obviously improved. Computer simulation results verify the effectiveness of the algorithm.