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针对极化交叉熵定义的缺陷,提出了一个新的替代参数。首先逐点计算各个像素与三种基本散射体之间的相似性参数,分析了目标与海杂波极化性质的差异,在此基础上对极化交叉熵重新定义。然后与功率相乘得到功率极化交叉熵。该参数既能反映目标与杂波像素功率的差异,也能反映极化性质的不同。最后,采用Parzen窗杂波拟合方法获得判决阈值。利用Radarsat-2数据进行实验比较,验证了所提参数用于CFAR舰船检测的有效性。
Aiming at the defects of polarization cross-entropy definition, a new alternative parameter is proposed. Firstly, the similarity parameters of each pixel and the three basic scatterers are calculated point by point, and the differences between the polarizations of the target and the sea clutter are analyzed. On this basis, the polarization cross entropy is redefined. Then the power is multiplied to obtain the power polarization cross entropy. This parameter can not only reflect the difference between target and clutter pixel power, but also reflect the different polarization properties. Finally, Parzen window clutter fitting method is used to obtain the decision threshold. Radarsat-2 data were used for experimental comparison to verify the validity of the proposed parameters for CFAR ship detection.