利用载噪比比较法测量天线G/T值研究

Research on G/T Value of Antenna by the Comparison of Carrier-to-noise Ratio

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。

The ratio of the gain Gof the antenna system to the noise temperature Tof the receiving system is called the G/Tvalue.It is a very important technical indicator in the parameters of the channel.It is a quality indicator for measuring the sensitivity of the ground station.The higher the G/Tvalue,the ground.The stronger the station’s ability to detect signals from satellites.Using the spectrum analyzer,the low-noise downconverter and the power divider to test the G/T value of the antenna system,the G/T value of the antenna system is measured by the carrier-to-noise ratio comparison method,and the formula and calculation formula of the method are introduced.Principle,through the G/Tvalue of the standard speaker,the target satellite beacon is integrated with the target antenna and the standard gain horn,and the respective normalized carrier-to-noise ratio can be obtained to obtain the final antenna G/T value.After specific test experiments,the G/Tvalue of the antenna was obtained.The experiment proved that the method is effective.