引言目前,民航空管系统的地空通信网主要是由基于陆基的VHF语音通信网和VHF地空数据通信网构成。但是随着民航事业的不断发展,以及信息技术的日新月异,传统的语音通信和数据通信已难以满足空勤工作的需要。特别是 Introduction At present, the air-ground communication network of the air traffic control system of the civil aviation is mainly composed of a land-based VHF voice communication network and a VHF air-ground data communication network. However, with the continuous development of civil aviation and the ever-changing information technology, traditional voice communications and data communications have been unable to meet the needs of aircrew operations. especially