Because of the complexity of the path of circular SAR,the range and azimuth received data are seriously tied up,which makes the motion compensation problem more complex.To deal with this problem,an autofocus back-projection algorithm is pro-posed.This algorithm compensates the random delay phase in the echo that realizes the focusing of imagery.Simulation results demonstrate the effectiveness of this algorithm.Furthermore this paper expands the autofocus back-projection algorithm to three-dimension image formation in circular SAR according to autoregressive thoughts.Compared with traditional BP algorithm,the proposed algorithm is more effective and advantageous.%圆周SAR由于平台运动轨迹的复杂性，导致沿航迹向和切航迹向回波信号存在严重耦合，因此成像处理运动补偿问题尤为复杂。本文针对圆周SAR成像运动补偿问题，首先分析运动误差对成像质量的影响；然后利用自聚焦BP算法对运动误差进行补偿，并与传统BP算法性能进行对比，验证了自聚焦BP算法对圆周SAR运动补偿的有效性；最后利用自回归思想将自聚焦BP算法进行改进并扩展到圆周SAR三维成像中，通过仿真实验，对比传统BP算法结果，验证了该算法在三维成像中的优势。
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