中文摘要：

在雷达系统中,CFAR处理的对象通常为杂波的包络。杂波包络的统计分布对于设计CFAR处理器至关重要,包络的统计分布通常由杂波的幅度概率密度函数（APDF）表征。解析形式的APDF是实现系统性能分析的关键。雷达杂波具有典型的非高斯性,适合采用α稳定分布模型来描述,然而该分布的概率密度函数不存在解析的表达,相应的APDF也无解析的表达。针对α∈[1,2]各向同性稳定杂波,采用线性混合模型,给出了一种各向同性稳定杂波APDF近似的解析模型,该模型具有形式简洁、计算简便的优点。基于对数矩性质,对各向同性杂波包络序列,提出了一种简便的稳定杂波参数的估计方法。

英文摘要：

In radar systems,it is feasible that amplitude probability density function（APDF） is analytically known and tractable for CFAR processing and detection.Unfortunately,there is no closed-form expression for the probability density function of envelop of stable clutter.To overcome such challenge,we have developed a closed-form model to approximate actual APDF of isotropic stable clutter forα∈[1,2].Proposed model fits actual APDF well while keeps concise,and hence,tractable form.Simulation results illustrate that proposed model is a valid approximation to actual APDF of stable clutter.Via Logarithm rioment,an approach to estimate parameters of clutter from series of isotropic stable clutter envelop is further proposed.