地表形变监测机载SAR图像数据精度分析与检验方法研究

项目名称： 地表形变监测机载SAR图像数据精度分析与检验方法研究

项目编号： No.41301487

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 赵迎辉

作者单位： 中国科学院遥感与数字地球研究所

项目金额： 25万元

中文摘要： 机载重轨差分干涉SAR能够监测地表形变，高精度SAR图像是重轨干涉处理的基础。当今导航系统和地形高程精度能够满足SAR聚焦要求，但图像中仍含有残余的位置偏倚和相位误差，为提取差分干涉相位，需进行残余误差补偿。本项目拟开展SAR成像技术同重轨干涉测量地表形变的关联研究。首先，研究SAR图像精度的系统分析方法，得到SAR图像精度同导航系统和地形高程误差的之间的束缚关系，阐明位置偏倚和相位失真的来源，为选择残余误差补偿方法提供参考。其次，研究SAR图像相位精度同地表形变测量精度之间的关系，探索通过重轨干涉试验来检校SAR图像精度的方法。通过本项目的研究，希望为机载SAR图像产品的精度分析方法提供理论和试验支撑，对SAR图像的误差来源进行追溯，为机载SAR平台与导航设备集成、以及运动补偿流程设计提供参考，最终为地表形变监测提供高品质的SAR图像数据。

中文关键词： 机载SAR 重轨干涉；地表形变；精度分析与检验；位置偏倚；相位误差

英文摘要： Airborne differential synthetic aperture radar interferometry(DInSAR) is a technique to measure the deformation of the surface through the repeat-pass acquisitions, where the SAR image with high precision is the fundamental of the deformation parameters extraction. The navigation data and digital elevation model used during SAR imaging can satisfy the image focusing requirement, but result in the position displacements and phase distortions in SAR image, which affects the DInSAR processing strongly. In this project, the accuracy of the SAR image will be investigated concerning the airborne DInSAR application. Firstly, the binding framework between the accuracy of the SAR image and the errors of the navigation system and digital elevation model is studied, which will reveal the production mechanism of the position displacements and phase distortions in the SAR image and promote the research of the compensation of the SAR residual errors. Secondly, the connection between the accuracy of the SAR image and that of the surface deformation measurements will be researched, which can provide a hopeful approach for testing the accuracy of the phase of the SAR image through the repeat-pass interferometry experiments. It is expected to explain the errors of the SAR image and locate and analyze the sources of those errors f

英文关键词： Airborne repeat-pass SAR interferometry；surface deformation；accuracy analysis and evolution；position displacement；phase distortion