一种高分三号SAR影像五参数变换模型几何精校正方法  

A Five Parameter Transformation Model for GF-3 SAR Image Precise Geometric Correction

作　　者：张文强 张波 刘荣[1] 陈卫荣[3] ZHANG Wen-qiang;ZHANG Bo;LIU Rong;CHEN Wei-rong(School of Surveying and Mapping Engineering,East China University of Technology,Nanchang 330013,China;Key Laboratory of Digital Earth Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;China Centre for Resources Satellite Data and Application,Beijing 100094,China)

机构地区：[1]东华理工大学测绘工程学院,南昌330013 [2]中国科学院空天信息创新研究院数字地球重点实验室,北京100094 [3]中国资源卫星应用中心,北京100094

出　　处：《科学技术与工程》2023年第20期8726-8734,共9页Science Technology and Engineering

基　　金：国家自然科学基金(41930110)。

摘　　要：为了更好且快速的提高单景高分三号影像的地理定位精度。提出了有理函数结合五参数变换方法的复合模型实现高分三号(Gaofen-3,GF-3)卫星一级影像产品的几何精纠正,所提5个参数均具有具体的物理意义。通过比较仅用影像附属的有理多项式参数,以及有理函数模型结合仿射变换方法的定位精度,表明在引入高分辨率数字高程模型且使用本文方法时,只用3~4个控制点便可有效提高GF-3号影像的定位精度。相比仿射变换模型,本文方法具有所需控制点数少且精度高的优点。并利用四景GF-3号合成孔径雷达(synthetic aperture radar,SAR)SAR影像对所提方法进行了实验验证,在引入高分辨率数字高程模型数据后,所提方法可将高分三号超精细条带(ultra fine strip,UFS)模式的影像定位精度纠正到约2个像素,精度要高于仿射变换的方法。To effectively improve the geographical positioning accuracy of the Gaofen-3(GF-3)image,a composite model of rational function combined with a five-parameter transformation method was proposed to realize the geometric correction of the first-level image products of GF-3,where the five parameters had specific physical meanings.Compared with the method with only the attached rational polynomial coefficients and the method combining the rational function model with the affine transformation method,the proposed method can effectively improve the positioning accuracy of GF-3 images with only 3~4 control points when introducing a high-resolution digital elevation model.In contrast with the affine transformation model,the proposed method has the advantages of fewer control points and higher accuracy.In experiments,four GF-3 SAR images were used to verify the proposed method.Thanks for introducing the high-resolution digital elevation model data,the proposed method can achieve the positioning accuracy of around two pixels for GF-3 synthetic aperture radar(SAR)SAR images with 3 m resolutions in ultra fine strip(UFS)mode,which is higher than that of the affine transformation method.

关 键 词：合成孔径雷达(SAR) 高分三号(GF-3) 有理函数 五参数 几何精校正 数字高程模型(DEM) 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]