改进的功率极化交叉熵舰船检测方法

Improved ship detection method based on span polarimetric cross entropy

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。

The paper describes a parameter to replace the polarimetric cross entropy （PCE） for improved ship detection. The method calculates the similarity parameters between the target and three canonical scattering mechanisms. The different scattering mechanisms between the target and cluster are analyzed based on the similarity parameter. Then, the PCE is redefined based on the similarity parameter. The span polarimetric cross entropy （SPCE） is calculated to describe the span and polarimetric difference between the target and a cluster. Finally, a Parzen window is used to estimate the cluster distribution. The effectiveness of this parameter is demonstrated using the Radarsat 2 data for CFAR ship detection.