基于散射机理的高分辨率极化干涉SAR城市目标三维模型重建研究

传统层析SAR技术得到的城市目标三维模型虽然能够分离出SAR分辨单元内各个散射体的高度信息，但是对数据数量要求很高，且没有考虑散射体的散射特征。这些都限制了该技术的发展。针对这些问题，本项目将极化干涉信息引入到层析SAR技术领域，提出基于散射机理的极化干涉SAR城市目标三维结构重建新思路。本项目在深入分析城市目标极化散射机理的基础上，研究利用极化SAR目标分解方法得到的参数确定SAR影像分辨单元内散射体的个数及各散射体的散射机制，然后研究基于极化干涉SAR散射体相位中心分离方法估算初始的目标三维结构模型。在此基础上，研究基于多基线高分辨率极化干涉三维结构模型重建方法。项目将选取典型试验区反演城市目标三维结构并进行精度评价。本项目对于拓展极化干涉SAR技术的监测能力，推动极化干涉SAR技术的发展有着重要的科学意义；对于大范围、快速构建目标三维结构模型以及应用于城市建设等有重要的意义。

Although traditional Tomographic SAR technique can separate height information of each scatterer in a SAR resolution element, it needs large number of images and does not consider the scattering characteristics of each scatterer. All these problems limit the development of Tomographic SAR technique. To solve these problems, the project brings polarimetric interferometric information into the field of Tomographic SAR technology, and proposes a new idea of urban target reconstruction based on polarimetric scattering mechanisms. The project will deeply analyze polarimetric scattering mechanisms of urban targets, and then determines the number of scatterers and their scattering mechanisms by using polarimetric decomposition method. Also, the project will study interferometric phase center of different scatterers and estimate initial model of urban targets. Based on above work, the project will study model reconstruction method based on multiple high resolution PolInSAR technique. Finally, we will select typical test area to inverse the three-dimensional structure of the urban targets and get accuracy evaluation. The significance of this project is to expand the monitoring capabilities of PolInSAR technology and promote the development of the PolInSAR technique. Also, it is important for the applications of three-dimensional structural model quick reconstruction for large area city.