利用载噪比比较法测量天线G/T值研究

Measurement of antenna G/T value by carrier to noise ratio comparisonHou Changman,Zhao Tingjun , Liu Cheng, Ma RongXiang,Wang Shuai

摘要:

天线系统的增益G与接收系统噪声温度T的比值称之为G／T值,是信道各参数中十分重要的技术指标,是衡量地面站灵敏度的质量指标,G／T值越高,表明地面站检测来自卫星信号的能力越强。利用频谱仪,低噪声下变频器以及功分器对于天线系统的G／T值进行测试,利用载噪比比较法对天线系统的G/T值进行测量,介绍了该方法计算时的公式和原理,通过标准喇叭的G/T值,融合待测天线和标准增益喇叭分别目标卫星信标,可获得各自的归一化载噪比,得到最终的天线G/T值。经过具体的测试实验,得到了天线的G/T值,实验证明,该方法确实行之有效。

Abstract:

Using spectrometer, low noise frequency converter as well as the power splitters for antenna system G/T value test, using the carrier to noise ratio comparison method of antenna system G/T value measurement, this paper introduces the principle and calculation formula, the method through the G/T value standard horn, the fusion of the antenna under test and standard gain horn target satellite beacon respectively, their respective normalized carrier to noise ratio can be obtained, get the final antenna G/T value. The G/T value of the antenna is obtained through specific test experiments, which proves that the method is indeed effective.