大入射余角海杂波相关特性分析及幅度拟合  

Correlation Analysis and Amplitude Fitting for Sea Clutter with Large Grazing Angle

作　　者：刘恒燕 熊伟 宋杰 崔亚奇 吕亚飞 LIU Heng-yan;XIONG Wei;SONG Jie;CUI Ya-qi;LYU Ya-fei(Institute of Information Fusion,Naval Aeronautical University,Yantai 264001,China)

机构地区：[1]海军航空大学信息融合所

出　　处：《电光与控制》2019年第6期60-64,共5页Electronics Optics & Control

基　　金：国家自然科学基金(61790554,61471380,61471381)

摘　　要：通过研究入射余角44°~69°的海杂波实测数据的时间相关特性、空间相关性及幅度统计特性发现,海杂波相关时间维持在毫秒量级,且随着入射余角增加,先增加后减小,时间相关性最强的入射余角在60°左右,而平均相关距离单元个数一直增加。针对大入射余角高分辨率海杂波的幅度统计特性提出一种新的海杂波幅度拟合混合分布,并通过KK分布、Rayleigh分布、对数正态分布及K分布的对比,证明了新的混合分布对大入射余角海杂波的拖尾部分具有良好的拟合效果。The temporal correlation characteristics,spatial correlation characteristics and the amplitude statistics of the measured sea-clutter data with the grazing angle from 44°to 69°were studied.Experiments showed that correlation time of sea clutter was maintained in the order of milliseconds,which increased at first and then decreased with the increasing of the grazing angle,and the strongest correlation time appeared at about 60°.At the same time,the average number of correlation distance units increased with the increasing of the grazing angle.Hybrid distribution,a new sea clutter amplitude fitting distribution,was proposed according to the amplitude statistics.Contrast test was made to the new distribution with such distributions as KK distribution,Rayleigh distribution,lognormal distribution and K distribution.The result shows that the new hybrid distribution has fine fitting effect to the sea clutter with large grazing angle,especially to its tailing characteristics.

关 键 词：海杂波 幅度统计特性 大入射余角 混合分布 时间相关性 空间相关性 

分 类 号：TN957.51[电子电信—信号与信息处理]