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描述了某船载卫通站天线跟踪丢失目标的故障现象,从天线跟踪系统的设备组成和工作原理入手,结合设备工作环境和条件,详细说明了故障排查与定位过程。针对接收机中频信号频带内发现的主信号漂移及杂散频率干扰现象,分析了C-L频段变频器本振频率漂移产生的原因,以及设备环境温度、振动等外部因素和器件老化等内部因素对本振频率参数的综合影响,给出了通过调节C-L变频器本振单元微调元件进行频率修正来规避杂散信号对主信号干扰的方法。结果表明,该方法能有效解决天线跟踪的故障问题。
Describes the failure phenomenon of tracking loss of an antenna on a satellite carrier, and starts with the equipment composition and working principle of the antenna tracking system. The working environment and conditions of the equipment are described in detail in the troubleshooting and positioning process. According to the main signal drift and spurious frequency interference found in the IF frequency band of the receiver, the causes of the frequency shift of the local oscillator frequency in the CL frequency band are analyzed. And the internal factors such as ambient temperature, vibration and aging of the device, The influence of the spurious signal on the main signal is given by adjusting the frequency of the local oscillator unit of the frequency converter. The results show that this method can effectively solve the problem of antenna tracking fault.