论文部分内容阅读
本文着重介绍一种不需要断开天线和接收机,直接测量卫星广播接收装置性能指数——G/T值的新方法。以前G/T的测量方法是分别测量天线的增益G和接收装置的噪声温度T之后计算得出的,但这种方法对于最近市场上出售的天线与高频头一体化型接收装置的G/T值测量就无法采用了。采用本文介绍的直接测量方法,可以实现G/T的直接测量。这种测量方法,不受测量系统噪声带宽特性的影响,又因为天线的电压驻波比(VSWR)对G/T值中G和T的影响是同样存在的,所以测量精度要比以前的方法高一些。本文介绍了测量原理、测量要点、测量误差及其消除方法,给出了实验结果。直接测量法和分别测量法所得到的结果,可以满足到0.4dB精度以内。
This article focuses on a new method that directly measures the G / T value of a satellite broadcast receiver without disconnecting the antenna and receiver. In the past, G / T was calculated by measuring the gain G of the antenna and the noise temperature T of the receiving device, respectively. However, this method is disadvantageous for the recent market of antennas for G / T value measurement can not be used. Using the direct measurement method described in this article, you can achieve direct measurement of G / T. This method of measurement is not affected by the noise bandwidth of the measurement system, and because the effect of the VSWR of the antenna on G and T in the G / T value is the same, the measurement accuracy is better than the previous method Higher. This paper introduces the measurement principle, measurement points, measurement errors and elimination methods, and gives the experimental results. Direct measurement and measurement results obtained separately, to meet the 0.4dB accuracy.