基于移动最小二乘法的机载SAR成像运动误差补偿方法

机载SAR平台在飞行过程中产生的运动误差会导致成像质量下降,利用测量数据提取运动误差是机载SAR运动补偿的重要手段之一。通过对机载SAR运动误差理论的推导,提出一种基于移动最小二乘法的机载SAR成像运动补偿方法,方法借助于惯性导航系统记录的东北天三维速度信息,对其进行处理,进而获得雷达平台的三维空间信息,再与后向投影算法结合,完成SAR成像运动补偿。方法是对最小二乘法进行改进,使其不需要对数据进行分段估计和平滑,还可以保证估计结果的正确性。实验结果验证方法对运动误差估计的准确性和有效性。

Motion error compensation for airborne SAR imaging based on moving least square method

The motion error generated by airborne SAR platform during flight will cause the image quality to degrade.Extracting the motion error using measurement data is one of the important means of airborne SAR motion compensation.Through the derivation of airborne SAR motion error theory,a method of airborne SAR imaging motion compensation based on moving least square is proposed.This method processes the north,east and up 3D velocity information recorded by the inertial navigation system,and then processes it.The three-dimensional spatial information of the radar platform is obtained,and then combined with the backward projection algorithm to complete the SAR imaging motion compensation.This method is to improve the least square method,so that it does not need to piecewise estimate and smooth the data,and can also ensure the accuracy of the fitted data.Experimental results verify the accuracy and effectiveness of the method for estimating motion errors.