星载高分辨率雷达摄影测量与干涉测量联合提取地形信息方法研究

项目名称： 星载高分辨率雷达摄影测量与干涉测量联合提取地形信息方法研究

项目编号： No.41271457

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 张路

作者单位： 武汉大学

项目金额： 75万元

中文摘要： 作为雷达遥感提取地表高程信息的两种主流技术，雷达摄影测量和干涉测量具有各自不同的优缺点。摄影测量应用限制条件少，但由于立体像对匹配难度大，高程测量精度通常不如干涉测量；干涉测量虽然高程测量精度高，但易受到去相干效应影响，同时存在整周模糊度和系统误差问题，需借助地面控制点进行定标。因此在困难地区地形测绘中单独采用一种技术往往难以提取到准确可靠的高程信息。针对这一问题，本项目将从建立两种技术各自的严格成像几何模型入手，在深入理解掌握地形高程与立体视差和干涉相位之间转化机理的基础上，开展两种技术联合提取地表高程信息方法的研究，充分发挥各自优势，相互弥补对方弱点，重点解决立体像对精确匹配和视差提取、干涉像对精确配准、大气相位估计去除、干涉相位解缠和定标、结果DEM融合处理等关键问题，建立二者联合从高分辨率星载SAR数据集中提取地表高程信息的处理流程，从而为我国困难地区地形测绘提供实用可靠的技术。

中文关键词： 合成孔径雷达干涉测量；雷达摄影测量；数字高程模型；高分辨率；影像匹配

英文摘要： As two major approaches to use SAR remote sensing data for topographic mapping, both StereoSAR and InSAR techniques have their own advantages and disadvantages. StereoSAR can be used with less constrains than InSAR, however, its accuracy in height measurement is usually worse than that of the later due to difficulty in stereo image matching over terrain relief areas. In contrast, although InSAR can achieve higher accuracy of height measurement, it is often disturbed by decorrelation effects as well as problems of integer cycle uncertainty and systematic errors for which GCPs are needed to perform calibrations. Consequently, for topographic mapping in terrain relief areas it is not easy to obtain accurate and reliable height information through the use of only either technique. Aiming at such a problem, in this project we are going to carry out a study on joint utilization of StereoSAR and InSAR for topographic mapping. The major goal is to make full use of advantages of the two complementary techniques to substantially improve our capability of height measurement in areas of rough terrain. Key problems to be solved include stereo/interfeometric image matching, atmospheric phase screen correction, phase unwrapping and calibration, DEM fusion, etc. The processing chain developed for high-resolution spaceborne SAR

英文关键词： InSAR；StereoSAR；DEM；High-resolution；Image matching