说明：  满足互易性条件下的几种经典的极化检测算法的仿真，包括恒虚警仿真和ROC曲线 Pd_Pf是对两种目标的仿真（两种目标的极化散射矩阵不同）
(Simulation of several classical polarization detection algorithms under the condition of reciprocity, including CFAR simulation and ROC curve. Pd_ Pf is the simulation of two kinds of targets (the polarization scattering matrix of the two targets is different))