一种机载重轨InSAR频域动态子孔径运动补偿方法  

A frequency-domain dynamic sub-aperture motion compensation method for airborne repeat-pass interferometric SAR

作　　者：王静[1] 李银伟 彭青 陈立福[3] 吴冬梅[1] WANG Jing;LI Yin-wei;PENG Qing;CHEN Li-fu;WU Dong-mei(College of Communication and Information Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Shanghai Radio Equipment Research Institute,Shanghai 200090,China;School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410004,China)

机构地区：[1]西安科技大学通信与信息工程学院,陕西西安710054 [2]上海无线电设备研究所,上海200090 [3]长沙理工大学电气与信息工程学院,湖南长沙410004

出　　处：《西安科技大学学报》2018年第2期339-344,共6页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学青年基金(61302133;41201468;41601508);上海自然科学基金(15ZR1439500)

摘　　要：对于机载重轨干涉SAR系统,由于2次飞行的运动轨迹误差不一致,导致2天线间的残余误差无法相互抵消,必须通过高精度的运动补偿才能提高DEM(Digital Elevation Model)反演的高程精度。针对现有方法中仅以图像质量来衡量,不能反映干涉SAR运动补偿性能的问题,文中首先对参考轨迹拟合及方位向重采样进行了论述,然后针对常规二级运动补偿中的波束中心近似和地物定位中的平地假设两个问题,提出了一种频域动态子孔径运动补偿方法,最后在考虑残余运动误差补偿、射频干扰抑制及成像算法选取后,详细给出了机载重轨In SAR的数据处理流程,以获得精确的机载重轨In SAR图像和干涉相位。仿真统计分析和实际In SAR数据的处理及DEM反演的结果,进一步验证了文中方法和数据处理流程的有效性。For airborne repeat-pass InSAR system,since the two flight trajectory errors are inconsistent,the residual errors between two antennas can’t be offset to each other.In order to improve the accuracy of DEM reconstruction,it is essential to eliminate the residual error through high-precision motion compensation method.The existing method that is only measured by the image quality can’t reflect the motion compensation performance of the interference SAR.Aimed at beam center approximate in the conventional motion compensation and flat assumption in target location,the frequency-domain dynamic sub-aperture motion compensation method is proposed.Then we present a processing scheme for airborne repeat-pass InSAR data to obtain accurate InSAR image and accurate interferometer phase.The Airborne P-band repeat-pass InSAR data is used to validate the processing chain.And the effectiveness of the algorithm is verified by simulation statistical analysis and actual DEM inversion result.

关 键 词：重轨InSAR 运动补偿 频域动态子孔径 残余运动 DEM反演 

分 类 号：TN827[电子电信—信息与通信工程]