论文部分内容阅读
简述了频谱仪噪声系数和灵敏度的基本概念。阐述了利用频谱分析仪测量天线噪声温度的原理和方法。分析了频谱分析仪本底噪声对天线噪声温度测量的影响,给出了频谱仪测量噪声功率的修正因子计算公式及数值修正曲线。最后给出了C波段13米车载天线噪声温度测量结果。理论分析和实测结果表明:当测量噪声功率与频谱仪的本底噪声之比小于或等于20d B时,应考虑频谱仪本底噪声对天线噪声温度测量的影响。
The basic concepts of the noise figure and sensitivity of the spectrum analyzer are briefly described. The principle and method of using the spectrum analyzer to measure the antenna noise temperature are described. The influence of noise floor of spectrum analyzer on the temperature measurement of antenna is analyzed. The calculation formula and numerical correction curve of correction factor of noise power of spectrum analyzer are given. Finally, the C-band 13 m car antenna noise temperature measurement results are given. Theoretical analysis and experimental results show that when the ratio of measured noise power to the noise floor of the spectrum analyzer is less than or equal to 20d B, the effect of spectrum noise floor noise on the antenna noise temperature measurement should be considered.