摘要
激励源是全相参多普勒天气雷达发射分系统射频激励调制脉冲信号和标定分系统射频测试调制脉冲信号的提供者,如果激励源输出的RF调制脉冲信号的功率下降比较多,或者时序控制脉冲幅度和脉宽发生变化,或者进入激励源的本振1、本振2的频率和功率发生变化,都将引起发射机发射功率的大幅度下降,从而造成回波信号异常等故障现象。通过2010年10月27日新疆阿克苏天气雷达激励源故障现象,并结合激励源的基本原理及雷达正常运行和非正常情况下关键点波形的对比分析揭示了CINAD/CC天气雷达激励源故障的成因,给出了故障诊断依据和测试排除的具体办法,为保证天气雷达业务实时运转提供了保障。
The excitation source is the provider of the radio frequency excitation modulation pulse signals of the launch subsystem and the radio frequency test modulation pulse signals of the BITE subsystem for the fully coherent Doppler weather radar. If the power of the output RF modulation pulse signals output by the excitation source drops obviously, or the amplitude and width of the sequential control pulse change, or the frequency and power of the first LO （Local Oscillator） and the second LO signals entering the excitation source change, the transmitter power will drop greatly, so to induce the breakdowns such as unusual echo signals. The breakdown causes of the CINAD/CC weather radar excitation source are analyzed, as an example, by means of the breakdown case of the weather radar excitation source occurred on 27 October 2010 at the Aqsu radar station, Xinjiang. The key-point waveforms under normal and abnormal conditions are analyzed and compared, and some suggestions for fault diagnosis and troubleshooting are given
出处
《气象科技》
2012年第5期713-718,共6页
Meteorological Science and Technology
关键词
激励源
时序控制
故障
诊断
排除
excitation source
sequential control
fault diagnosis
troubleshooting
