森林覆盖下人造目标PolInSAR图象的参数反演模型

Parameter Inversion Model for Targets Beneath Canopy Using PolInSAR Images

极化干涉合成孔径雷达(PolInSAR)不仅可以用于地表参数反演,而且可以用于对森林覆盖下人造目标的参数估计。寻找适当的反演模型,对于有效实现人造目标探测具有重要意义。以L波段PolInSAR图象的应用为背景,针对带有隐藏人造目标的森林区域,推导了一个多层随机体散射模型。该模型在反映森林区域特性的同时,建立了雷达观测数据与目标物理参数之间的联系。文中利用简化的三层PolInSAR模型对带有人造目标的森林区域进行了仿真,然后利用仿真的PolInSAR数据对文中提出的模型进行了验证。参数反演结果表明所提出模型是能够用于正确地提取森林及人造目标的真实参数。

Polarimetric SAR Interferometry （PollnSAR） can be used not only for parameter inversion of ground, but also for the estimation of target beneath canopy. An appropriate model is of most importance for parameters inversion. Under L-band PolInSAR scenario, this paper derives a multi-layer random scattering model that can be used for parameter inversion of forestry area containing a man-made target beneath. This model can reveal the characteristics of forestry area as well as establish the relationship between observed data and parameters of test area. Simulation is performed by a simplified three-layer model. The preliminary results show that the proposed model can be used for parameter extraction.