噪声参数传递标准件标准值的不确定度评定

Evaluation of Measurement Uncertainty of Noise Parameters Standards

针对噪声参数测量系统的计量工作中,因缺乏噪声参数传递标准件不确定度量值所带来的困扰,推导了噪声参数传递标准件标准值的不确定度评定的测量模型,研究了蒙特卡洛法在噪声参数传递标准件标准值的不确定度评定中的应用,分配了测量影响量的概率密度函数。依托MATLAB开发平台,开发了专用的噪声参数不确定度评定软件,它可实现扫频、点频两种模式下,定制化噪声参数不确定度评定,计算结果包含噪声参数的标准值的最佳估计及不确定度,噪声参数标准值的分布图、包含概率等多种信息。文中给出了(2～6)GHz频段内噪声参数测量值和评定的不确定度的数据,经过对比验证,评定的不确定度结果合理有效。

The lack of uncertainty of noise parameters standards often impedes the calibration of noise parameters systems. In this paper, a measurement model for noise parameters standards was derived and the evaluating of measurement uncertainty of noise parameters standards using Monte Carlo method was proposed. Based on MATLAB Integrated Development Environment, we developed a dedicated software for evaluating noise parameters standards’ measurement uncertainty, and this software can customized noise parameters uncertainty in both sweep and point frequency modes. Furthermore, the calculation results include not only the best estimate of noise parameters and its uncertainty, but also the probability density distribution of standard Value of noise parameters. By comparison, the result was proved correct and reasonable.