CINRAD/SA雷达系统噪声温度异常偏高的分析处理

Analysis and processing of abnormality of nosie temperature on the high side for CINRAD/SA radar system

汕头雷达站的新一代天气雷达CINRAD/SA在2008-06出现1次因系统噪声温度超标导致接收机性能变差的现象,检查发现接收机中RF噪声源性能下降是造成系统噪声温度超标的主要原因。经过更换RF噪声源(4A25)模块和适配参数进行调整后,系统噪声温度超标得到有效控制,雷达系统恢复正常。本文描述了故障检修过程及CINRAD/SA雷达系统噪声温度的简单原理。

There was a phenomenon of the receiver performancebecame worse,which is the result of the over standard of the system noise temperature in the new generation of weather radar CINRAD/SA in Shantou radar station in June, 2008. Through checking, it is found that the main reason is that RF noise source decreasing causes the over standard of system noise temperature. By replacing RF noise source （4A25） module and adjusting adapation parameters, the over standard of the system noise temperature can be controlled well, then the radar system returns to normal. This text described the process of corrective maintenance and introduced simple principle of noise temperature for CINRAD/ SA radar system.