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2015年民航云南空管分局某VHF遥控台由于2M电路环路造成多个VHF地空通信频率先后出现空中和地面严重噪音干扰随着环路的解除,对飞行安全造成了影响。经过分析,我们认为在FA16网络中如果引入2M切换器后一旦出现环路,VHF设备的静噪信号(SQ)将被环路当成PTT信号,造成长发。为此我们设计了实验验证了以上论断,并给出了组网的建议。
In 2015, a VHF remote control station of Yunnan Air Traffic Control Branch of the Civil Aviation of China caused serious airborne and ground-level noise interference due to the multiple VHF air-ground communication frequencies caused by the loop of the 2M circuit. With the release of the loop, flight safety was affected. After analysis, we think that if a loop occurs after the 2M switch is introduced in the FA16 network, the muting signal (SQ) of the VHF device will be regarded as a PTT signal by the loop, causing long hair. To this end, we designed the experiment to verify the above assertion, and gives recommendations for networking.