噪声系数测量的一个关键指标就是测量不确定度,测量时所用的噪声源是引起噪声系数测量不确定度的一个明显因素.噪声源的精确校准可以有效地降低噪声系数的测量不确定度,因此它是获得高质量的噪声系数测量的关键因素.介绍了两种对微波和毫米波噪声源超噪比进行校准的方法,分别是Y因子法和增益法,并全面分析了引起校准不确定度的因素.“,”One of the key performance parameters for noise figure is the level of measurement uncertainty.A significant contributor to this is the uncertainty surrounding the noise source used when measuring noise figure on the device.Accurate noise source calibration is critical to minimizing noise figure uncertainty,and thus a critical factor for obtaining quality noise figure measurement.In this paper,two methods of Y-Factor and Gain are introduced to measure the microwave and millimeter-wave noise source,and the measurement uncertainties are also studied.