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在民航空中交通管制和对空广播通信中,甚高频电台发挥着重要作用。然而近些年来,由于电磁环境变化,航空无线电频段108MHz~137MHz受干扰事件时有发生。这将直接影响飞行安全。民航甚高频电台干扰中,互调干扰成为主要干扰类型。本文通过理论分析计算,对民航互调干扰中互调分量影响因素进行分析,提出了用链路预算模型判别二阶、三阶发射机互调与接收机互调的方法,为民航互调干扰判别提供了新方法和新思路。
VHF radio plays an important role in civil air traffic control and air-to-air broadcasting. However, in recent years, due to changes in the electromagnetic environment, the radio frequency band 108MHz ~ 137MHz interference occurred from time to time. This will have a direct impact on flight safety. Civil aviation VHF radio interference, intermodulation interference has become the main type of interference. This paper analyzes the influencing factors of intermodulation components in civil aviation intermodulation interference through theoretical analysis and calculation, and proposes a method of judging intermodulation between second- and third-order transmitter intermodulation and receiver using link budget model, Discrimination provides a new method and new ideas.