极化散射的各向异性分析及应用

分析典型极化散射机制随着视角等参数变化时产生的各向异性对从物理角度解译遥感图像具有重要意义.为了更好地从散射矩阵中提取出具有一定物理含义的极化信息,分析极化参数的各向异性特征,建立了任意取向散射体的电磁散射模型,模拟其在Cameron极化空间中的变化轨迹分布.其次,基于子孔径的方法,用无人机合成孔径雷达(UAVSAR)数据进行实验验证,计算出了取向角、z参数与视角的关系,与桥体的微扰法(Small Perturbation Method,SPM)二次散射仿真模型的计算结果吻合.

Anisotropic Analysis of Polarimetric Scattering and Its Application

The angular anisotropy analysis of polarimetric signatures of canonical scattering has an important meaning for the interpretation of remote sensing images from the view of physical scattering mechanism.In order to extract more useful information from the polarimetric scattering matrix and analyze the anisotropic properties of the polarimetric parameters,several canonical scattering models were used to simulate the migration tracks on the Cameron polarimetric space.Based on the sub-aperture method,Unmanned Aerial Vehicle Synthetic Aperture Radar(UAVSAR)data is used for validation.The data-calculated parameter z and orientation angle are consistent with the Small Perturbation Method(SPM)double scattering simulated results.Finally,based on the anisotropic analysis,a new method of extracting polarimetric information was proposed.Parameters were defined to describe the purity and stability of the scatterer respectively.