Beidou satellite navigation system is a global satellite navigation system independently developed and operated by China. It consists of three parts: space segment, ground segment and user segment. The space segment includes 5 geostationary orbit satellites and 30 non-geostationary orbit satellites. The ground segment includes several ground stations such as the main control station, injection station and monitoring station. The user segment includes Beidou user terminals and terminals compatible with other satellite navigation systems.

　　Among the world's four major satellite navigation systems, the European "Galileo" and Russia's "GLONASS" both claim a positioning accuracy of 1 meter, while the US GPS and my country's Beidou are both 10 meters. High-precision location services. The United States is vigorously developing a new generation of satellite navigation systems, and claims that the new system positioning accuracy will reach an astonishing 1 mm.

　　At present, the Beidou satellite navigation system has entered the stage of accelerating the networking of the space segment. According to the "three-step" plan of system construction, a regional navigation system covering the Asia-Pacific region will be built by 2012, and a regional navigation system covering the whole world will be built by 2020. The world provides a global system of navigation and positioning services.

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