单幅SAR遥感影像定位的几何分析  

GEOMETRIC ANALYSIS OF SINGLE SAR REMOTE SENSING IMAGE POSITIONING

作　　者：邢帅[1] 徐青[1] 何钰[1] 蓝朝桢[1] 

机构地区：[1]信息工程大学测绘学院,河南郑州450052

出　　处：《红外与毫米波学报》2009年第6期461-465,共5页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金项目(40771142);国家西部1:50000地形图空白区测图工程项目"合成孔径雷达影像制图技术";上海市博士后科研资助计划;北京大学为新基金;信息工程大学测绘学院课题(Y0801)

摘　　要：在数字高程模型(DEM)支持下的单幅影像迭代定位方法(IPM)是利用单幅遥感影像进行目标定位或修测地图的主要方法.一直以来,SAR影像IPM的几何意义都不甚明了.依据SAR影像距离投影的原理,对SAR影像IPM的计算过程进行了几何分析,提出以地面倾角和起始高程点入射角作为已知量,推导了其近似的收敛条件以及收敛速度计算公式,并分析得到地面倾角和起始高程值是影响SAR影像IPM收敛性和收敛速度的主要因素.最后,分别利用模拟数据和真实数据对几何分析的结论进行了实验验证.实验结果表明,理论分析结论正确合理,有助于深入分析SAR影像上像点与地面点的几何关系.The iterative positioning method （IPM） based on digital elevation model （DEM） is an important way in object positioning or map revision with single remote sensing image. The geometry principle of synthetic aperture radar （SAR）- IPM has not been clear so far. In this study, the iterative calculation process of SAR-IPM was analyzed by using geometry theory based on distant projection of SAR image. Two known variables, slope obliquity and incidence angle of initial position, were chosen to derive the approximate convergence criterion and the convergence speed function. It is found that slope obliquity and incidence angle are leading factors for the convergence and convergence speed of SAR-IPM. Experiment results with simulated data and real data have proved that the approximate convergence criterion is accurate and reasonable, and the convergence speed function is correct. The result will help to analyze the geometry relation between the SAR image point and the corresponding ground point.

关 键 词：单幅影像迭代定位方法 SAR影像 数字高程模型 

分 类 号：P237[天文地球—摄影测量与遥感]