SAR影像角反射器点相位中心的高精度拟合方法  

High-precision Fitting Method for Phase Center of Corner Reflector in SAR imagery

作　　者：赵瑞山[1,2] 董碧涵 王立波 石大鹏 戴激光 ZHAO Ruishan;DONG Bihan;WANG Libo;SHI Dapeng;DAI Jiguang;无(School of Geomatics,Liaoning Technical University,Fuxin,Liaoning 123000,China;LUOJIA Laboratory,Wuhan 430079,China;China Energy Engineering Group Liaoning Electric Power Survey&Design Institute Co.Ltd.,Shenyang 110000,China;CCTEG Shenyang Engineering Company,Shenyang 110000,China)

机构地区：[1]辽宁工程技术大学测绘与地理科学学院,辽宁阜新123000 [2]湖北珞珈实验室,武汉430079 [3]中国能源建设集团辽宁电力勘测设计院有限公司,沈阳110000 [4]中煤科工集团沈阳设计研究院有限公司,沈阳110000

出　　处：《遥感信息》2024年第6期56-63,共8页Remote Sensing Information

基　　金：国家自然科学基金(42071428、42071351);辽宁省教育厅基本科研项目(青年项目)(LJKQZ20222438);湖北珞珈实验室开放基金(230100022)。

摘　　要：角反射器(corner reflector,CR)作为合成孔径雷达(synthetic aperture radar,SAR)影像上的地面控制点,其相位中心提取精度尤为重要。然而,SAR影像中的斑点噪声、分辨率差异和视角差异会对CR点的相位中心提取造成误判和偏差。文章提出了一种基于自适应距离-幂指数加权质心法的CR点相位中心高精度拟合方法,通过引入自适应拟合窗口来解决周围像素对CR点像点提取的干扰问题,并采用距离-幂指数加权法考虑距离关系对权重的影响,提高了CR点相位中心的提取精度。该方法在中卫遥感卫星定标场地区的高分三号SAR影像数据上进行验证,1 m和5 m分辨率影像上提取精度分别达到0.20个像素和0.44个像素。该研究对于提高SAR影像中CR点相位中心的准确性和可靠性具有重要意义。As a ground control point on synthetic aperture radar(SAR)images,the extraction accuracy of the phase center of the corner reflector(CR)is particularly important.However,speckle noise,resolution differences,and viewing angle differences in SAR images can cause misjudgment and bias in the phase center extraction of CR points.In this paper,a high-precision fitting method for the phase center of CR points based on the adaptive distance-power exponential weighted centroid method is proposed,which solves the interference problem of surrounding pixels on the extraction of CR point image points by introducing an adaptive fitting window,and uses the distance-power exponential weighting method to consider the influence of distance relationship on the weight,so as to improve the extraction accuracy of the phase center of CR points.The proposed method is verified on the GF-3 SAR image data in the calibration field area of Zhongwei remote sensing satellite,and the extraction accuracy of 1 m and 5 m resolution images reaches 0.20 pixels and 0.44 pixels,respectively.The research in this paper is of great significance for improving the accuracy and reliability of the phase center of CR points in SAR images.

关 键 词：角反射器 SAR 拟合窗口 加权质心法 相位中心 自适应 细分插值 

分 类 号：P237[天文地球—摄影测量与遥感]