复杂地形条件下的PolInSAR森林模拟和特征参数分析  

PolInSAR forest simulation and characteristic parameters analysis under complex terrain conditions

作　　者：卢丽君[1] 郭玄烨 邱志伟 李俊峰 LU Lijun;GUO Xuanye;QIU Zhiwei;LI Junfeng(Chinese Academy of Surveying&Mapping,Beijing 100036,China;School of Marine Technology and Geomatics,Jiangsu Ocean University,Lianyungang,Jiangsu 222000,China)

机构地区：[1]中国测绘科学研究院,北京100036 [2]江苏海洋大学海洋技术与测绘学院,江苏连云港222000

出　　处：《测绘科学》2024年第7期112-122,共11页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(42171442)。

摘　　要：为了探究PolInSAR在不同地形条件下散射机理的变化规律,为后续开展PolInSAR技术在复杂地形条件下的森林参数估计和反演研究打下坚实的基础以欧洲空间局发布的PolSARPro软件中为PolInSAR森林模拟定制开发的PolSARprosim模拟器为基础,对模拟过程中的地形模型构建和森林位置图生成步骤进行改进,以适用于复杂地形条件下对森林场景的PolInSAR影像的模拟,实现了对平地、迎坡面和背坡面的完整三维地形场景的模拟。基于此模拟器生成了不同地形条件下的PolInSAR影像对的后向散射系数图、干涉相位图和相干系数图,均符合真实三维场景下的SAR的几何特性变化规律。通过对模拟的结果分析发现PolInSAR影像对的体相干系数随坡度增大而减小,干涉相位和垂直波数随坡度增大而增大,它们的灵敏度随着入射角增大而减小的变化规律。针对森林高度的反演研究发现,当考虑地形坡度对垂直波数的影响时,除了在较大的垂直波数条件以外整体的森林高度反演误差均比较稳定。PolInSAR technology has great application potential and research value in forest parameter estimation and inversion.The aim of this paper is to explore the changing rules of the scattering mechanism of PolInSAR under different terrain conditions and to lay the foundation for the following research on forest parameter estimation and inversion using PolInSAR technology under complex terrain conditions.This paper improves two steps of the terrain model construction and forest location map generation during the simulation process to be suitable for the simulation of PolInSAR forest scenes under complex terrain conditions,i.e.,flat terrain,facing slope and back slope constituting complete three-dimensional terrain scenes,referring to the PolSARprosim simulator customized and developed by the PolSARPro software released by the European Space Agency.Authors generate the simulated PolInSAR image pairs of the backscatter,interference phase,volume coherence coefficient maps under different geometric observation conditions(radar incident angle and terrain slope),all of which conform to the geometric characteristics of SAR in real three-dimensional scenes.Through the analysis of simulation results,it was found that the volume coherence coefficient of PolInSAR images decreases with increasing slope,the interference phase and vertical wavenumber increase with increasing slope,and their sensitivity decreases with increasing incident angle.This article focuses on the inversion of forest height and finds that when considering the influence of terrain slope on vertical wave number,the overall inversion error of forest height is relatively stable except for larger vertical wave number conditions.

关 键 词：极化干涉合成孔径雷达 森林模拟 特征参数 地形坡度 

分 类 号：P237[天文地球—摄影测量与遥感]