山区地形星载SAR影像的几何纠正  

The Correction of Geometric Distortions of the Spaceborne SAR Image in Alpine Area

作　　者：李震[1] 孙文新[1] 曾群柱[1] 

机构地区：[1]中国科学院兰州冰川冻土研究所

出　　处：《遥感技术与应用》1997年第4期2-7,共6页Remote Sensing Technology and Application

基　　金：国家自然科学基金;测绘遥感信息工程国家重点实验室开放研究基金;天山冰川观测实验站开放基金

摘　　要：随着搭载合成孔径雷达的各种卫星不断发射，ＳＡＲ的研究越来越受到重视。由于ＳＡＲ数据独特的成像方式，山区地形的星载ＳＡＲ图像几何形变十分复杂。通常应用控制点，采用多项式拟合的方法已经无法将其改正。依据ＳＡＲ的几何成像模型，利用有关卫星轨道参数和数字高程模型，进行山区地形ＳＡＲ影像的几何纠正研究。研究利用少量轨道参数和ＤＥＭ数据，通过坐标变换和投影成像误差纠正建立正确的坐标位置，并采用邻近元采样法完成几何纠正。以上方法应用于山区ＥＲＳ－１／ＳＡＲ影像的处理试验结果表明，该方法能够用于山区复杂地形的几何纠正。The investigation of the SAR application became increasingly important with the launch of various satellites carried SAR sensors.The geometric distortion of SAR image in alpine terrain is more complex caused by the sidelooking imaging technique and by terrain undulation,which cannot be rectified using regularly method,such as two dimensional polynomials by use of ground control points.In this paper,the correcting method of geometric distortion in alpine terrain using fly parameters and DEM was introduced ,based on the imaging geometry of SAR image.The algorithm of correcting the distortion was presented,according to the analysis of the error’s resource of distortion caused by terrain height variation.An experiment to test this algorithm was carried out by using the ERS1 SAR image in Banff,Canada.The result showed this algorithm produces high precision result to correct the geometric distortion in alpine area.

关 键 词：SAR 山区地形 DEM 几何纠正 

分 类 号：TN957.51[电子电信—信号与信息处理]