Y因子法测量天线噪声温度的不确定性分析  

Uncertainty analysis of antenna noise temperaturemeasurement using Y-factor method

作　　者：银秋华[1] 秦顺友[1] 张冀 YIN Qiuhua;QIN Shunyou;ZHANG Ji(The 54th Institute of CETC,Shijiazhuang Hebei 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《河北省科学院学报》2024年第2期44-48,共5页Journal of The Hebei Academy of Sciences

基　　金：国家科技部重点研发计划项目(2018YFE0207500)。

摘　　要：介绍了Y因子法测量天线噪声温度的原理方法,分析了常温负载和低噪声放大器噪声温度的不确定性对天线噪声温度测量的影响,推导了天线噪声温度测量的绝对误差计算公式,研究了低噪声放大器噪声温度对天线噪声温度测量精度的影响,提出了改善天线噪声温度测量精度的方法。最后,给出了65 m射电望远镜天线L波段、C波段和X波段噪声温度测量结果。测量结果的误差分析表明:65 m射电望远镜天线噪声温度测量的绝对误差≤±2.48 K。In this paper,the measurement principle and procedure for the antenna noise temperature by Y-factor method are described.The effect of uncertainties for ambient load and low-noise amplifier noise temperature on antenna noise temperature measurement is analyzed,and the absolute error formula of antenna noise temperature measurement is derived.The effect of the noise temperature of LNA on the measurement accuracy of antenna noise temperature is studied,a method to improve the measurement accuracy of antenna noise temperature is presented.Finally,the measured results of the noise temperature of 65 m radio telescope antenna at L-band,C-band and X-band are given.The error analysis of the measurement results shows that absolute error of antenna noise temperature measurement of the 65 m radio telescope is≤±2.48 K.

关 键 词：Y因子法 天线噪声温度测量 不确定性 

分 类 号：TN820[电子电信—信息与通信工程]