Physically Based Polarimetric Volumetric Scattering From Cylindrically Dominated Vegetation Canopies

Physically Based Polarimetric Volumetric Scattering From Cylindrically Dominated Vegetation Canopies
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来自圆柱形植被冠层的基于物理的偏振体积散射

DOI:
10.1109/tgrs.2018.2867861
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发表时间:
2019-03
影响因子:
8.2
通讯作者:
Li Zengyuan
Li Zengyuan
中科院分区:
工程技术1区
文献类型:
--
作者:
Du Yang;Yang Chao;Liu Qinhuo;Li Zengyuan

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为了提高极化合成孔径雷达观测的实用性,提取植被冠层的生物物理信息,重要的是要发展良好的理解的散射机制,引起极化散射响应,并将其应用到发展的极化协方差矩阵的有效分解模型。在本文中,我们介绍了一个更严格的方法来表征的体积散射分量的三组分散射模型由弗里曼和Durden。改进的严格性有两个方面:1)使用T矩阵模型来计算倾斜介质柱的极化散射,以及2)将局部入射角的变化作为植被柱的取向的函数并入。这些改进解决了Freeman-Durden模型目前的一些局限性。本文还提供了一个敏感性分析的协方差矩阵的各个组成部分作为几个物理参数,包括圆柱体的大小,其介电常数,和圆柱体的取向分布的函数。这样的分析是改进的反演算法的发展的先驱。
To advance the utility of polarimetric synthetic aperture radar observations for extracting biophysical information about vegetation canopies, it is important to develop good understanding of the scattering mechanisms that give rise to the polarimetric scattering response and to apply it toward the development of effective decomposition models of the polarimetric covariance matrices. In this paper, we introduce a more rigorous approach to characterizing the volume scattering component of the three-component scattering model developed by Freeman and Durden. The improved rigor has two aspects: 1) the use of a T-matrix model for computing the polarimetric scattering by an inclined dielectric cylinder and 2) the incorporation of the change in local incidence angle as a function of the orientation of the vegetation cylinders. The improvements address some of the current limitations of the Freeman-Durden model. This paper also provides a sensitivity analysis of the various components of the covariance matrix as a function of several physical parameters including cylinder size, its dielectric constant, and the orientation distribution of cylinders. Such an analysis is a precursor to the development of improved inversion algorithms.
DOI: 10.2139/ssrn.3649241
发表时间: 2019-09
期刊: DecisionSciRN: Heuristics (Sub-Topic)
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