基于完备对数正态分布模型的隐形飞行器动态RCS统计特性研究

基于完备对数正态分布模型的隐形飞行器动态RCS统计特性研究

内容简介：在运动过程中，飞行器的RCS通常随时间或雷达波入射角随机变化，呈现不规律的特性。采用统计量或统计模型研究目标RCS的变化就变得十分必要。已有文献的研究对象多为传统飞行器，对于隐形飞行器的研究较少。该文选择了一种典型隐形飞行器作为研究目标，采用物理光学方法和物理绕射理论相结合的方法计算了其在不同飞行姿态下的RCS，并采用斯怀林Ⅰ型、Ⅲ型分布、卡方分布和对数正态分布模型对计算得到的RCS的统计特性进行了研究。针对隐形目标的RCS数据的平均中值比会出现小于1的情况，文中提出了对数正态分布的完备情况。根据统计模型误差和拟合优度检验结果，对数正态分布对于研究目标的RCS分布拟合效果较好。

Abstract：RCS of aircraft varies with time or radar wave incident angle without regular pattern during its movement. It is necessary to analyze RCS variation using statistic items or models. The research objects of existing literatures are mostly conventional aircrafts. Research on stealth aircraft is poor. A typical stealth aircraft is selected as the research object in this paper. Its dynamic RCS data under different flying attitudes are evaluated by the combination method of physical optics and physical theory of diffraction. And Swerling type Ⅰ and typeⅢ distribution, chi-2 distribution and lognormal distribution are applied to analyze the statistic characteristics of the RCS datasets. As the ratio of mean to median of stealth target can be less than 1, the complete form of lognormal distribution model is proposed. Lognormal distribution model can provide a better approximation of the RCS datasets than the other models concerning the model errors and the results of fitting goodness test.

作者：史伟强, 徐乐, 史小卫, 汪宁,

关键词：雷达散射截面, RCS, 隐形飞行器, 统计特性, 卡方分布, 完备对数正态分布, 拟合优度检验