1 外文文献原稿和译文原稿 Beidou positioning Preface Navigation satellite systems can provide all time, all weather and high accuracy positioning, navigation and timing services to users on the earth surface or in the near-earth space. It is an important space infrastructure, which extends people ’s range of activities and promotes social development. Satellite navigation is bringing up revolutionary changes to the world politics, economy, military, technology and culture. With a long history and a splendid culture, China isone of the important cradles of early human civilization. In ancient times, Chinese people used the Big Dipper ( Beidou ) for identifying directions, and invented the world ’s first navigation device, the pass ( Sinan ), which was a great contribution to the development of world civilization. In modern society, the Chinese-built BeiDou ( COMPASS ) system will e another contribution to the mankind. In early 1980s, China began to actively study the navigation satellite systems in line with China ’s conditions. In2000, BeiDou Navigation Demonstration System is basically established, which made China the third nation in possession of an independent navigation satellite system following the United States and Russia. At present, China is steadily accelerating the construction of the BeiDou Navigation Satellite System, and has already essfully launched 10 satellites so far. The BeiDou system will meet the demands of China ’s national security, economic development, technological advances and social progress, safeguard national interests and enhance prehensive national strength. The BeiDou system mit to providing stable, reliable and quality satellite navigation services for global users. Along with other GNSS providers, the BeiDou system will jointly promote the development of satellite 2 navigation industry, make contributions to human civilization and social development, serve the world and benefit the mankind . I. System Description The BeiDou system prised of t
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