大入射余角海杂波相关特性分析及幅度拟合

Sea Clutter Correlation Analysis and Amplitude Fitting for Large Grazing Angle

摘要:

对入射余角 44°到 74°的海杂波实测数据进行时间相关性、空间相关性分析,并提出了一种新的海杂波幅度拟合混合分布。实验表明,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。通过 KK分布、Rayleigh分布与 K分布的对比,表明新的混合分布对大入射余角海杂波的拖尾特性具有良好的拟合效果。

Abstract:

In this paper, the time correlation and spatial correlation of the measured-sea-clutter data from 44° degree to74° degree grazing angle was analysed and a new sea clutter amplitude fitting distribution, a hybrid distribution, was pro.posed. Experiments show that correlation time of sea clutter is in the order of milliseconds, and it increases first and thendecreases with increasing incident angle and the strongest correlation time appears at about 60 degree. At the same time,the average of correlation distance units increases. The comparison of KK distribution, Rayleigh distribution and K distri.bution shows that the new hybrid distribution fits the sea clutter well, especially its tailing characteristics.