基于简缩极化数据的三分量分解模型

基于部分极化波的二分理论,提出了一种针对简缩极化数据的三分量分解模型。该模型将简缩极化数据的Jones相干矩阵分解成表面散射、偶次散射和体散射三种散射机制Jones相干矩阵之和,进一步得到这三种散射机制各自的散射功率。选取德国根多夫市普拉特灵(Plattling)地区的TerraSAR-X全极化数据生成简缩极化数据,用提出的三分量分解模型对得到的简缩极化数据进行分解,并将分解结果与全极化数据的Pauli分解结果进行对比。实验结果表明:提出的简缩极化数据三分量分解模型能够很好地描述表面散射和体散射的散射行为。但是,相比全极化数据的分解结果,提出的模型高估了体散射分量,导致偶次散射分量偏小,这个问题需要进一步的研究来解决。

Three-component scattering model for compact polarimetric SAR data

In this paper,a three-component scattering model is proposed to decompose compact polarimetric(CP)synthetic aperture radar images based on the partially polarized wave dichotomy theorem.We express the Jones covariance matrix of CP data as the sum of three simple scattering mechanisms,which are volume scatter,double-bounce scatter and surface scatter.An advantage of this model fit approach is that the scattering contributions from the three basic scattering mechanisms can be calculated directly from CP SAR images without the reconstruction of fully polarimetric(FP)data,which can reduce superposition of error significantly.A FP image of Plattling region in Germany,acquired by TerraSAR-X,is chosen to generate CP data,and decomposed by the proposed decomposition.The Pauli decomposition result of FP data has been used for comparison.The model proposed is shown to describe the behavior of the surface scatter and the volume scatter as well as the latter.However,the model proposed has overestimated the volume scatter,which requires many inputs to solve this scattering problem.