运动补偿对机载SAR重轨干涉成像的影响分析  

Effect of Motion Compensation on Airborne Repeat Pass InSAR Imaging

作　　者：方东生[1] 吕孝雷[1] 李缘廷 李芳芳[1] 钱江[3] 

机构地区：[1]中国科学院电子学研究所空间信息处理与应用系统技术重点实验室,北京100190 [2]中国交通通信信息中心,北京100011 [3]电子科技大学,四川成都611731

出　　处：《雷达科学与技术》2016年第4期355-363,共9页Radar Science and Technology

基　　金：百人计划项目(No.Y53Z180390);国家自然科学基金(No.61401428;61401077);军民交通运用项目(No.GFZX0404080102)

摘　　要：机载重轨干涉成像时,两轨数据需要选择平行的参考轨迹,以便保证补偿之后基线的稳定性。由于实际飞行轨迹与参考轨迹之间存在运动偏移,需要进行运动补偿。区别于机载SAR单轨运动补偿,选择平行的参考轨迹往往需要搬移较大的角度。为了定量分析基于搬移的运动补偿引入的残余误差对干涉成像的影响,建立了基于搬移的SAR成像模型,将搬移导致的影响等效为斜视角模型和斜距残余误差。随后推导了由"搬移"引入的残余误差对成像的影响,以及引入的相位误差对重轨干涉的影响,并通过仿真验证了理论推导的正确性。分析结果为机载重轨干涉对平台飞行控制要求提供了一种分析手段。In order to keep stable spatial baseline,two parallel straight trajectories should be chosen in synthetic aperture radar（SAR）imaging for two repeat airborne interferometry channels.Due to the aircraft trajectory deviations from the nominal straight flight track,the motion errors should be compensated.Compared with airborne single pass compensation method,it needs to shift big deviation for two pass imaging.In order to analyze quantitatively the effects of shift-based motion compensation residual errors on interferometric SAR imaging,a mathematical model of shift-based motion compensation is established,and the form of the errors is similar to the slant range error model with a squint angle.The effect of quadratic residual slant range error on InSAR imaging and repeat pass interferometry is deduced.Simulation shows the validility of our derivation results.The research provides an analysis approach for analysing the platform flights control requirement for repeat pass interferometric SAR.

关 键 词：机载重轨干涉 运动补偿 参考航迹 残余误差 

分 类 号：TN958[电子电信—信号与信息处理]