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一、引言全球空运量的迅速增长，使得现行的陆基航行系统越来越不适应航空业的发展，为此，ICAO经过十年经济和技术论证提出了未来航行系统（FANS）的概念，用星基航行系统来代替现行的陆基航行系统，这一方案在各国、各地区先后得到了认可并加以实施。为了和国际接轨，在下世
I. INTRODUCTION The rapid growth of global air traffic has made the current land-based navigation systems less and less suited to the development of the aviation industry. To this end, ICAO has proposed the concept of a future navigation system (FANS) after ten years of economic and technical arguments. Satellite-based navigation system to replace the existing land-based navigation system, this program in all countries and regions have been recognized and implemented. In order to be in line with international standards, in the next world