机载超宽带SAR运动误差建模与分析

摘要

Airborne Ultra-Wide Band Synthetic Aperture Radar (UWB SAR) has larger integrated angle and longer synthetic aperture, which gives rise to more complexity in motion errors. In light of this, first the motion model of sirbome UWB SAR was derived. Then, the expression of echo spectrum in presence of motion error was deducted. Theoretic analysis on the reason of the motion error impacts on SAR imaging and the influences on SAR images induced by the different motion errors were carried ont. Experiment results on simulated data proved the validity of the theory analysis presented in this paper.%机载超宽带合成孔径雷达(UWB SAR)具有大积累角和长合成孔径的特点,这使得这类SAR系统的运动误差变得非常复杂.建立了机载UWB SAR运动误差模型,并基于该模型推导了存在运动误差情况下的回波信号频谱.分析了运动误差影响SAR成像处理的根本原因,以及不同特性运动误差对SAR图像所产生的不同影响.仿真实验结果证明了文中理论分析的正确性.