A Five-Component Decomposition Method with General Rotated Dihedral Scattering Model and Cross-Pol Power Assignment
A Five-Component Decomposition Method with General Rotated Dihedral Scattering Model and Cross-Pol Power Assignment
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DOI：
10.3390/rs15184512
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发表时间：
2023-09
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影响因子：
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通讯作者：
Yan-Cui Duan;Sinong Quan;Hui Fan;Zhenhai Xu;Shunping Xiao
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文献类型：
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作者：
Yan-Cui Duan;Sinong Quan;Hui Fan;Zhenhai Xu;Shunping Xiao
基于模型的极化分解由于其简单性和清晰的极化合成孔径雷达（PolSAR）数据的物理解释而被广泛研究。虽然有许多精细的基本散射模型和设计良好的分解方法，体散射（OVS）的高估仍然可能发生在高度定向的建筑物，导致严重的散射机制的模糊性。众所周知，不仅是植被区，而且朝向建筑物也会引起强烈的交叉极化。为了改善散射机制的模糊性，一个合适的散射模型的有向建筑物和一个可行的策略来分配植被和有向建筑物之间的交叉极化功率是同样重要的。从这个角度出发，我们提出了一种五分量分解方法，该方法采用一般的旋转二面角散射模型和交叉极点功率分配策略。建立了一般的旋转二面角散射模型来描述面向建筑物的整体和内部交叉极化散射，并通过使用基于特征值的描述子DOOB来实现体积和旋转二面角散射之间的交叉极化功率分配。此外，还提出了一种简单的物理意义明确的分支条件用于模型参数反演。在星载Radarsat−2 C波段和机载UAVSAR L波段PolSAR数据集上的实验证明了该方法在定量表征散射机制方面的有效性和优势，特别是对于高度定向的建筑物。
The model-based polarimetric decomposition is extensively studied due to its simplicity and clear physical interpretation of Polarimetric Synthetic Aperture Radar (PolSAR) data. Though there are many fine basic scattering models and well-designed decomposition methods, the overestimation of volume scattering (OVS) may still occur in highly oriented buildings, resulting in severe scattering mechanism ambiguity. It is well known that not only vegetation areas but also oriented buildings may cause intense cross-pol power. To improve the scattering mechanism ambiguity, an appropriate scattering model for oriented buildings and a feasible strategy to assign the cross-pol power between vegetation and oriented buildings are of equal importance. From this point of view, we propose a five-component decomposition method with a general rotated dihedral scattering model and an assignment strategy of cross-pol power. The general rotated dihedral scattering model is established to characterize the integral and internal cross-pol scattering from oriented buildings, while the assignment of cross-pol power between volume and rotated dihedral scattering is achieved by using an eigenvalue-based descriptor DOOB. In addition, a simple branch condition with explicit physical meaning is proposed for model parameters inversion. Experiments on spaceborne Radarsat−2 C band and airborne UAVSAR L band PolSAR datasets demonstrate the effectiveness and advantages of the proposed method in the quantitative characterization of scattering mechanisms, especially for highly oriented buildings.