在流动vlbi的观测试验中，天线系统噪声温度和天线效率是观测前系统调试和检测的两项重要内容。
Antenna system noise temperature and antenna efficiency are the most important items in the system debugging and checking before the VLBI observation.
混频器的变频损耗和噪声温度的测量可以用改变中频部分的噪声温度使接收机的系统噪声温度变化来加以确定。
The conversion loss and noise temperature of mixers is determined by changing the IF noise temperature so as to change the noise temperature of the receiver system.
在提出日凌干扰处理新模型的基础上，根据太阳视面与天线主瓣半功率点截面的相对运动关系，系统阐述了日凌时天线噪声温度的分析方法。
A new model of dealing with solar radiating disturbance is put forward and a systematic explanation to the antenna noise temperature analysis in case of solar radiating disturbance is made.
该系统主要完成两大类功能：测试低噪声器件的噪声温度和校准固态噪声源的超噪比。
The system provides two major functions including measuring noise temperature of low noise devices and calibrating the Excess noise Ratio (ENR) of solid-state noise sources.
经过外场测试，天线在S/X双频段具有高增益、低噪声温度的优良性能，天馈系统在S波段能进行精密跟踪及S/X双频高效率接收。
Antenna have high gain, low noise temperature characteristic under test in experimentation, and it can precision tracking at S-band, high efficiency receive at S/X-band.
接收设备工作在低温环境下，能够有效降低接收系统的噪声温度，提高系统G/T值。
The receive system must have high G/T performance. When the receiver operates under low temperature, the receive system temperature will be significantly reduced.
接收设备工作在低温环境下，能够有效降低接收系统的噪声温度，提高系统G/T值。
The receive system must have high G/T performance. When the receiver operates under low temperature, the receive system temperature will be significantly reduced.
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