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一、前言随着民航事业的迅猛发展,飞行流量不断增大,民航飞行对管制部门的要求越来越高,对地空指挥通信上质量的要求也不断提高。但由于民航空中管制甚高频(VHF)通信系统VHF设备的数量及使用的频点的增高,及其它无线电通信系统也越来越多,无线电互调干扰出现的频率也不断增加,给管制工作带来了严重的影响,所以合理选择新增地空通信的频率及排除无线电互调干扰的问题也成了民航空中管制甚高频(VHF)通信系统中需解决的难题。
I. INTRODUCTION With the rapid development of civil aviation and increasing flight flow, the requirements of civil aviation flight on regulatory agencies are getting higher and higher, and the requirements on the quality of air-ground command and communication are also constantly increasing. However, as the number and frequency of VHF equipment used in the Air Traffic Control VHF (VHF) communications system have increased and other radiocommunication systems have become more and more frequent, the frequency of inter-radio interference has also increased, Therefore, the reasonable choice of the frequency of new ground-to-air communications and the issue of excluding radio intermodulation interference have also become problems to be solved in Civil Aviation Air Traffic Control VHF communications systems.