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本文介绍了以月亮为校准源,以液氮低温负载与常温负载为定标基准,利用开关型辐射计,进行天线参数测量的基本原理和方法。被测天线口径为5米,工作波长为7.5厘米,馈源采用石家庄通信研究所研制的复合式多模喇叭。测量结果表明,用射电天文方法测量天线参数可得到满意结果,既精确又方便。此法还能方便地测出用经典方法不能测试的天线噪声温度。
This paper introduces the basic principle and method of measuring the antenna parameters using the moon as the calibration source, the low temperature liquid nitrogen load and the normal temperature load as the calibration standard, and the use of the switch radiometer. The measured antenna diameter of 5 meters, the working wavelength of 7.5 cm, the source of Shijiazhuang Institute of Communications developed composite multi-mode speaker. The measurement results show that using radio astronomy method to measure the antenna parameters can get satisfactory results, which is accurate and convenient. This method can also easily measure the antenna noise temperature that can not be tested by the classical method.