摘要
混响室搅拌过程中的有效独立样本数与其性能评估密切相关。文章从Weibull分布出发,推导了混响室中接收功率样本峰值的概率密度函数,给出了样本峰值的期望值与独立样本数之间的关系;提出采用样本峰值与均值之比(简称峰均比)的方法估计测量数据的独立样本数。对比现有的独立样本数评估方法——相关角度法,峰均比法适用于混响室任意搅拌方式,物理意义自洽,计算过程相对简单。相关角度法与峰均比法的对比测试结果验证了峰均比法的准确性。
Independent sample number is a key figure of merit in characterizing the performance of the stirring process in a reverberation chamber.Starting from the Weibull distribution,the article derives the probability density function of the maximum received power in a reverberation chamber,presents the relationship between the maximum-to-mean ratio and the independent sample number,and proposes a method to use the maximumto-mean ratio of the received power to estimate the independent sample number.Different from the correlationangle method,the maximum-to-mean ratio method can be applied to arbitrary stirring process,the physical meaning of the method is clear and the method itself is self-consistent,the calculation process is relatively easy.The validity of the proposed method is verified by measurements.
基金
国防基础科研计划(JCKYS2021DC05)
南京航空航天大学前瞻布局科研专项。
关键词
独立样本数
峰均比
电磁混响室
independent sample number
maximum-to-mean ratio
electromagnetic reverberation chamber
