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80年代初,国际民航组织(ICAO)认识到:由于现有系统传播距离的限制及其他系统的多变性在精度和可靠性上的影响,现在的通信、导航、监视系统很难在全世界范围内以统一的方式运行。另外,现行航行系统在空中和地面都存在着话音通信的限制,并缺少空一地数字数据交换系统。为此,ICAO 在1983年成立了与未来航行系统(FANS)有关的专门委员会,到1988年,提出了一个主要基于
In the early 1980s, the International Civil Aviation Organization (ICAO) recognized that today's communications, navigation and surveillance systems are difficult to deploy worldwide because of the limitations of existing system propagation distances and the variability of other systems in accuracy and reliability Within a unified way to run. In addition, existing air navigation systems have limitations of voice communication over the air and on the ground, and lack of air-to-land digital data exchange systems. To this end, ICAO established a special commission relating to the future navigation system (FANS) in 1983 and, by 1988, came up with a proposal based mainly on