中文摘要：

基于机载合成孔径雷达（SAR）正弦运动误差模型,本文了研究了机载超宽带SAR运动补偿方法。首先,本文从理论上解释了传统＂两步运动补偿法＂原理,并分析了＂两步运动补偿法＂的优势与不足。其次,基于分析结果,文中提出一种＂两步运动补偿法＂的改进处理流程,称为＂单步运动补偿法＂。在＂单步运动补偿法＂中,用于补偿距离空变相位误差的＂二阶补偿＂由在距离弯曲校正（RCMC）后的回波域内进行改为在RCMC前的回波域内进行。与原始＂两步运动补偿法＂相比,＂单步运动补偿法＂具有更好的高频运动误差补偿性能。文中详细推导了所提运动补偿方法,并通过仿真实验证明了该方法的有效性。

英文摘要：

Based on the sinusoidal motion error model of airborne synthetic aperture radar（SAR）,the motion compensation （MoCo） methods for airborne ultrawide band（UWB SAR） are studied.First,we explain the rationale of the two-step MoCo strategy. And an analysis of the advantage and disadvantage of this MoCo strategy is carried out.Based on the analysis results,an extended two-step MoCo strategy with modified implementation flow is proposed,which is called the one-step MoCo strategy.In one-step MoCo strategy, the second-order MoCo used for compensating the range-variant phase error is implemented before the range cell migration correction （RCMC） processing,instead of after the RCMC processing.As compared to the traditional two-step MoCo strategy,the one-step MoCo strategy has better performance on compensating the high frequency motion error.This paper deducts the proposed MoCo method in detail, and proves its validity with simulation experiment.