海面角反射器的极化旋转域特性研究

Study on characterization of sea corner reflectors in polarimetric rotation domain

海面角反射器是反舰导弹的主要诱骗干扰手段之一。研究海面角反射器的极化散射特性具有重要的军事应用价值。极化旋转域解译方法能够有效挖掘目标散射多样性中蕴含的丰富散射信息。本文利用极化相关方向图解译工具分析了典型三面角和二面角结构的极化旋转域特性差异。在此基础上以八面体角反射器和二十面体角反射器为研究对象,分析了角反射器极化旋转域特征随方位角、频率以及海况等级的变化情况,揭示了海面角反射器极化旋转域特性演化规律。通过特征提取,研究发现极化相关度、极化相关起伏度、极化相关特征最小值、极化相关对比度和极化相关特征反熵敏感于舰船目标和角反射器干扰的极化散射差异。研究工作为角反射器干扰的抑制和鉴别提供了关键技术支撑。

The sea corner reflector is one of the main decoy jamming method of anti-ship missile.The study on polarimetric scattering characteristics of sea corner reflectors has important military application value.The polarimetric rotation domain interpretation method can effectively mine the abundant scattering information contained in the scattering diversity of targets.The polarimetric correlation pattern interpretation tool is used to analyze the characteristics difference of canonical trihedral and dihedral structures in the polarimetric rotation domain.On this basis,the octahedral and icosahedral corner reflectors are taken as the research objects,and the variations of the polarimetric rotation domain characteristics of the corner reflectors with the azimuth,frequency and sea condition level are analyzed.The variation law of the polarimetric rotation domain characteristics for the sea corner reflector is revealed.Through feature extraction,it is found that the mean value of correlation,standard deviation of correlation,minimum correlation,correlation contrast and correlation anisotropy are sensitive to the polarimetric scattering difference between the ship target and the cornet reflector.The research work provides key technical support for the suppression and identification of corner reflector interference.