干燥地表雷达遥感多层介质性质耦合机制研究

项目名称： 干燥地表雷达遥感多层介质性质耦合机制研究

项目编号： No.41201346

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地理学

项目作者： 宫华泽

作者单位： 中国科学院遥感与数字地球研究所

项目金额： 25万元

中文摘要： 本项目以干燥地表雷达遥感穿透机理作为认知对象，为提取低损耗介质覆盖下强散射目标的多维特征进行先期理论研究，相关机理与技术也将促进干旱区环境研究、资源调查、我国自主的太空遥感技术等方面的发展。 主要研究内容包括：通过对覆盖介质与隐伏介质目标介电性质的分析，深刻认识其对微波能量的消长能力；并结合地表粗糙度等影响微波传播的因素，建立干燥地表雷达遥感穿透深度模型，科学认知干燥地表雷达遥感穿透机理；进而论证SAR在干旱区的地下目标探测能力；然后基于机理认识，利用PolSAR技术剥离多层目标的主要散射贡献，明确各层介质目标的极化散射特征；通过模型参数分析，及各层介质目标性质参量与极化散射特征的比对，定量化分析多层介质性质的耦合机制及其对雷达后向散射能量的影响，初步形成干旱区隐伏目标特征提取技术，并提出有利于干旱区隐伏目标特征提取的目标结构与SAR系统配置参数。

中文关键词： 复介电常数；雷达遥感穿透机理；全极化SAR；多层介质；耦合机制

英文摘要： The project takes a drying surface SAR penetration process as a cognitive object, in order to extract multi-dimensional characteristics of strong scattered target under low-loss materials, earlier theoretical research will be carried out. Corresponding theory and technology will promote arid area environment research, resource investigation, our country's own space remote sensing technology and other aspects. The main research contents include dielectric property analysis on cover medium and hidden target, and deep understanding on their attenuation and enhance effects of microwave energy. Combining the surface roughness data, SAR penetration model will be developed, and based on the models we can understand SAR penetration process and demonstrate the feasibility of SAR to detect hidden target in arid region. And in view of this theory, the major scattering contribution of multi-layer target will be extracted using PolSAR technology. And polarimetric and scattering characteristics of multi-layer target will be determined. Moreover, based on model parameter analysis and comparison between physical and chemical properties of multi-layer target and their polarimetric characteristics, coupling mechanisms of the properties of multi-layer target can be obtained, and optimal structure and SAR system configuration para

英文关键词： complex dielectric constant；SAR penetration process；PolSAR；multi-layer；coupling mechanisms