气象回波特征随机过程的模拟  

Simulation of Random Processes with the Charicterictics of Weather Echo

作　　者：张玲玲[1] 常建平[1] 朱根才[1] 

机构地区：[1]南京航空航天大学,江苏南京210016

出　　处：《计算机仿真》2007年第12期88-93,共6页Computer Simulation

摘　　要：文章在Matlab环境中模拟了同时具有气象回波一阶统计特征和二阶统计特征的随机过程。首先,利用反变换法、同分布随机过程合成方法、变量变换法、Matlab函数直接生成法模拟了具有气象回波特征随机过程的一阶特征。在模拟气象回波特征的二阶特性时,选择AR模型模拟高斯功率谱,在阶数的选择上采用了一种优化简便的方法,实现了更好的模拟效果。模拟立方功率谱时,提出了在Matlab环境中采用频率采样法达到了更好的模拟效果。The random processes with the firsr-order as well as the second-order statistical characteristics of the weather echo signal are simulated.First of all,several methods such as inverse-transformation method,random processes of the same distribution interact method,parameters translate method and direct from Matlab functions method are used to generate the series with the firsr-order statistical characteristics.AR modal is chosen to discribe the gaussian power spectrum and a better simulation is aquired by a procised method.Frequency sample method based on Matlab is shown to describe the cubic power spectrum and gets a better simulation.

关 键 词：气象回波特征 高斯功率谱 立方功率谱 瑞利分布 对数正态分布 

分 类 号：TN955[电子电信—信号与信息处理]