植被分布式SAR极化干涉复相关系数建模与分析  

Modeling and analyzing complex coherence for vegetation observed by distributed polarimetric SAR interferometric system

作　　者：李廷伟[1] 梁甸农[1] 黄海风[1] 

机构地区：[1]国防科技大学电子科学与工程学院

出　　处：《电波科学学报》2010年第3期415-421,609,共8页Chinese Journal of Radio Science

基　　金：国家自然科学基金项目(No:60902092);国家部委基金资助项目(No:41307020203)

摘　　要：针对两层结构植被模型,建立了分布式SAR极化干涉复相关系数模型,研究了散射机理和收发模式对干涉复相关系数分布规律的影响,研究表明:对于一发两收分布式SAR极化干涉系统,极化复相关系数在复平面上的分布是变化规律不确定的曲线,曲线变化规律依赖于三种散射机理与极化之间的相对变化关系,最后,重点分析了几种典型场景下的复相关系数分布特征,以及不同场景下分布曲线与单位圆的交点的分布特点。所建模型及分析结论可为分布式SAR极化干涉系统设计和植被参数反演新方法研究提供参考。Aiming at the two-layer vegetation,the model of the complex coherence for the distributed polarimetric SAR interferometric system is presented, and then the effects of scattering components and relationship between receive-transit mode of the interferometric radar to the complex coherence are analyzed. For the distributed polarimetric SAR interferometric system working in the single-transmit mode, its distribution of polarimetric complex coherence is not a line,but a curve changing erratically. Moreover,the changing rule of the curve depends on the relative relationships between the three different scattering mechanisms. Finally distributions of polarimetric complex coherence for some typical scenarios and distributions of cross-points between the line and the unit circle are studied. The presented model and analyzed conclusions offer some valuable references for the design of Pol-InSAR system and the proposition of new vegetation inversion methods.

关 键 词：极化干涉SAR 植被参数反演 二次散射 分布式系统 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]