载噪比直接法测量卫星转发器G/T值的精度研究

Research on the Accuracy of Satellite Transponder G/T Measurement Using Carrier-Noise Ratio Direct Method

阐述利用载噪比直接法测量卫星转发器天线品质因数G/T值的原理,对测试链路进行建模分析,研究大气损耗、天线方向跟踪误差给测量精度带来的影响。最后给出利用载噪比直接法测量卫星转发器G/T值的实例,与卫星转发器的出厂测试值进行对比,结果表明二者吻合度较高。

In this paper, the principle of measuring the G/T value of satellite transponder antenna by using the direct method of carrier to noise ratio is described. The modeling analysis of the test link is carried out, and the influence of atmospheric loss and antenna direction tracking error on the measurement accuracy is studied. Finally, an example of measuring G/T value of satellite transponder by using carrier noise ratio direct method is given, and the result is compared with the ex factory test value of satellite transponder. The result shows that the two methods are in good agreement.