旋转微动目标InSAR三维成像特性分析

Analysis of InSAR 3D Imaging Characteristics of Target with Rotational Micro-Motion

基于单航过InSAR系统,对任意姿态旋转微动目标的InSAR干涉相位以及三维成像特性进行了研究,首次揭示了微动目标在InSAR成像中的"栅栏"效应。首先建立任意姿态旋转微动目标的三维几何模型和回波模型,并给出SAR成像结果。然后通过对比InSAR主/辅通道的SAR成像结果,证明微动目标的干涉相位近似等于微动目标旋转中心所处位置的干涉相位,微动目标的旋转参数、旋转平面的姿态对其影响可以忽略。在此基础上通过分析InSAR成像结果,指出旋转微动目标的InSAR三维成像呈现为沿方位向分布的"栅栏"效应。"栅栏"的高度和长度分别由微动目标旋转中心的高度向坐标和旋转参数决定。仿真验证了理论分析的正确性。

Based on single-pass InSAR system,the inteferometric phase and InSAR 3D imaging characteristics of target with rotational micro-motion are studied,and the ＂barrier＂ effect of target with rotational micro-motion in the InSAR image is revealed for the first time.Firstly,both 3D geometric model and signal model of the rotational target with arbitrary attitude are built in this paper,and the imaging results are derived.Then,by comparing the imaging results of InSAR＇s two channels,the interferometry phases of the rotational target are proved to be approximate equal to the inteferometry phase of the location where the rotational center lies in,and the effect of the rotational parameters and the attitude of the rotational target can be neglected.On the basis,it is pointed out that the InSAR image result of the rotational target shows the ＂barrier＂ effect which spreads along the cross range direction.The height and the length of the ＂barrier＂ depend on the vertical direction coordinate of the rotation center and the rotational parameters respectively.The analyses are verified by simulation experiments.