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1988年,国际民航组织下属的未来航行系统(FANS)委员会选择全球导航卫星系统(GNSS)作为未来民用航空导航系统。它可以在飞机飞行过程中确定飞机的实时位置、到目的地的航线距离以及与预定航线的偏差。此后,FNS委员会成立专门小组进行研究,并于1992年4月提出GNSS实质性模式及分阶段实施的意见,尔后,还多次召开会议予以完善、充实。GNSS的定义是:这是一个全球性的位置和时间的测定系统,包括一个或几个卫星星座、机载接收机和系统性完好监控。初步打算是以美、俄军方
In 1988, the ICAO Sub-Committee on Future Navigation Systems (FANS) selected Global Navigation Satellite System (GNSS) as its future civil navigation system. It can determine the real-time position of the aircraft, the route to the destination and the deviation from the scheduled flight during the flight. Since then, the FNS Commission has set up a special group to conduct the research. In April 1992, it put forward the substantive mode of GNSS and put it into practice in phases. Afterwards, it held several meetings to improve and enrich it. GNSS is defined as: This is a global location and time measurement system that includes one or more satellite constellations, airborne receivers and system integrity monitoring. The initial plan is based on the United States and Russia