China has placed the last of the BeiDou Navigation System satellites in orbit. The system has been under development since 2000, and includes satellites in both geo-stationary and non-geostationary orbits. With more satellites than America''s GPS system, the BeiDou offers greater accuracy, and can now compete with Russia''s GLONASS and Europe''s Galileo systems. So what is BeiDou and its potential applications? How does it differ to existing global satellite systems? And what impact will it have on China''s economy and its ability to develop associated technologies?

中國已將最后一顆北斗導航系統衛星送入軌道。2000年以來中國一直再發展該導航系統,系統包括地球靜止軌道和非地球靜止軌道衛星。比起美國的GPS系統,北斗衛星數量更多,精確度更高,可以與俄羅斯的格洛納斯導航系統和歐洲的伽利略導航系統相抗衡。那么,什么是北斗都行,以及北斗導航的潛在應用有哪些呢?北斗導航與現有的全球衛星系統有何不同?北斗對中國經濟及其開發相關技術的能力產生什么影響?