极化SAR目标相对最优极化研究

Research on Optimization of Polarimetric Contrast Enhancement of Polarimetric SAR

极化SAR通过测量地物目标的散射回波得到极化散射矩阵或Stokes矩阵,利用极化合成技术得到任意发射和接收极化组合下的天线接收功率。目标相对最优极化就是选取一种收发极化状态使得研究目标和背景地物的接收功率对比度达到最大。文中首先分析了目标相对最优极化的模型,指出了它们的优缺点,然后提出了一种新的改进模型,并用交替迭代方法进行了模型的解算,最后结合荷兰Flevoland地区全极化数据作了试验,证明了其有效性和正确性。

Polarimetric SAR measures the amplitude and the phase of scattering echo to get the complex scattering matrix or Stokes matrix of ground targets. The, power received by the antenna at any ellipse orientation and ellipticity angle can be calculated using the technique of polarization synthesis. The aim of the opti- mization of polarization contrast enhancement（OPCE） is to find a specific configuration of transmission and reception antenna to get the best contrast between the target and the background. The paper discusses the OPCE problem. First of all, the models used are analyzed and the faults are pointed out. Then an improved model and an alternately iterative calculation method are derived. Test based on the quad-polarization data of Flevoland in the Netherlands has been made. It proves the correctness and validity of the method.