一种距离向偏移的SAR运动补偿方法

分析了载机距离向偏移对SAR图像质量的影响，提出了一种距离向非定点的运动补偿方法。建立了距离向偏移的回波信号模型。通过分析回波信号存在距离向偏移时的频谱得出距离向偏移对SAR图像的影响。即当载机沿正弦曲线运动时，SAR图像主瓣峰值降低，并且有成对回波产生。将运动误差分解为与斜距无关量和有关量，对无关量进行补偿，利用合理近似，对有关量进行补偿。该方法不但可以补偿景物中心的运动误差，而且可以补偿整个距离向的运动误差。仿真结果验证了该方法的可行性。

A Method of SAR Motion Compensation to Trajectory Deviation in the Range

The paper analyzed the influence of the trajectory deviations to the SAR image quality,and proposed a motion compensation method in the range.Firstly,the paper constructed the signal model when the trajectory deviation exits.Secondly,it got the effect which came from the trajectory deviations by analyses of the frequency,it was that when the plane fly alone the sine trajectory,the main lobe peak of SAR image depresses with the paired echo generating.Thirdly,it decomposed the motion errors to two parts,one depends on the range,which could be compensated directly;the other doesn't depend on the range,which could be compensated by approximating.This method could compensate motion errors not only at the center of the scene,but also including the all range cell.The simulation result validated the method was feasible.