基于反射对称性的极化SAR舰船目标CFAR检测

摘要

Reflection symmetry is a very importance property in polarization scattering. The correlation between the co⁃pola⁃rization channel and cross⁃polarization channel is described by reflection symmetry detection,it has important application in po⁃larization synthetic aperture radar(PolSAR)target detection. Based on complex Wishart distribution and combined with product model,it is inferred that the statistic model of the reflection symmetry detection quantity obeys K⁃distribution. The measured da⁃ta verified that good fitting effect of the clutter data is achieved by using the proposed model. Ship target detection is implemen⁃ted by the method of constant false alarm rate(CFAR)based on K⁃distribution model,and the experiment results verify the effi⁃ciency of the proposed detection.%反射对称性是极化散射中十分重要的一种性质。反射对称性检测量刻画了共极化通道和交叉极化通道间的相关性，在极化合成孔径雷达（PolSAR）目标检测中有重要应用。在复Wishart分布的基础上，结合乘积模型，推导出反射对称性检测量统计模型服从K 分布，利用实测数据证实该模型对杂波数据具有很好的拟合效果。最后基于K 分布模型，用恒虚警率（CFAR）方法进行了舰船目标的检测，实验结果验证了该方法的有效性。