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.