基于非中心χ^2伽马模型的杂波仿真研究

Research on Simulation of Non-Central Chi-square Gamma Clutter Model

随着现代雷达系统的发展,出现了杂波幅度不服从瑞利分布的情况。对数正态和韦布尔分布是在对雷达数据进行拟合的基础上提出来的,但是它们并不能对其物理成因做出解释。非中心χ2伽马分布(NG)能很好地解释雷达杂波的物理成因,本文通过理论分析,建立了归一化杂波模型。同时对NG、对数正态、韦布尔3种分布进行比较,证明NG分布可以用来模拟后两种分布,并对NG分布的产生过程进行了计算机模拟,得到了有价值的仿真结果。

The amplitude of radar clutter doesn＇t submit the rayleigh distribution with the development of modern radar system. Log-rinrmal and Weibull distribution are conceived on the base of fitting radar data. But they can＇t interpret the physical reason of clutter. Noncentral chi-sqare gamma distribution （NG） can interpret the physical reason well, and we analyse this distribution in theory, presenting generalized radar clutter model. NG is compared with log-normal and weibull distribution, proving it can simulate the latter. Finally, it simulates the process of generating NG clutter sequence and the result is useful for practical work.