摘要
本文结合粗糙面电磁散射小斜率近似方法和合成孔径雷达(SAR,Synthetic Aperture Radar)图像仿真技术,针对粗糙面高分辨率SAR电磁散射回波的空间相关性进行了分析,结果显示:对于本文中所仿真粗糙面,当SAR空间分辨率达到分米级时,SAR图像相邻像素散射场存在较强的相关性,且相关系数的大小随粗糙面粗糙度以及空间分辨单元的增大而降低,同时,随着粗糙面相关长度的增大而增大。本文所得结论对高分辨率SAR在陆地和海洋遥感中的应用具有一定参考意义。
When the resolution of synthetic aperture radar(SAR)is low,the scattering field of each resolution unit of rough surface SAR image is superimposed from the scattering field of many sub scattering points contained in the resolution unit.However,due to the randomness of the distance from each sub scattering point to the radar,the scattering field phase of each resolution unit of SAR will be random,so the scattering field is not spatially correlated.However,with the improvement of SAR spatial resolution,not only the randomness of the distance from the sub scattering surface contained in each resolution unit of rough surface SAR image to radar will be significantly reduced,but also the distance from adjacent resolution units to radar will not change much.These factors will affect the spatial correlation of the scattering field of rough surface high-resolution SAR.Combined with the small slope approximation method of rough surface electromagnetic scattering and SAR image simulation technology,this paper analyzes the spatial correlation of rough surface high spatial resolution SAR electromagnetic scattering echo.The results show that when the spatial resolution of SAR reaches decimeter level for the rough surface simulated in this paper,there is a strong correlation between the scattering fields of adjacent pixels in the SAR image,and the size of the correlation coefficient decreases with the increase of the roughness of the rough surface and the spatial resolution unit,and increases with the increase of the correlation length of the rough surface.The conclusions of this paper have certain reference significance for the application of high-resolution SAR in land and ocean remote sensing.
作者
徐志超
王运华
张彦敏
Xu Zhichao;Wang Yunhua;Zhang Yanmin(Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,China;Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China)
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第9期49-57,共9页
Periodical of Ocean University of China
基金
山东省重点研究发展计划项目-国际合作项目(2019GHZ023)
国家自然科学基金面上项目(41976167)资助。
关键词
高分辨率合成孔径雷达
粗糙面
相关系数
相位差
high-resolution Synthetic Aperture Radar(SAR)
rough surface
correlation
phase difference
