GPS system (U.S.A.)

GPS system is the United States from the 1970s began to develop, the main purpose is to provide real-time, all-weather and global navigation services for the land, sea and air, and used for some military purposes such as intelligence gathering, nuclear explosions and monitoring and emergency communications, after more than 20 years of research and experimentation, at a cost of 30 billion U.S. dollars, by 1994, the global Coverage of up to 98% of the 24 GPS satellite constellation has been laid.

2. Beidou System (China)

BeiDou satellite navigation system is a global satellite positioning and communication system developed by China itself, and is the third mature satellite navigation system after the U.S. GPS global positioning system and Russia GLONASS. The system consists of space end, ground end and user end, and can provide high-precision and highly reliable positioning, navigation and timing services for all kinds of users on a global scale in all-weather, round-the-clock basis, with short message communication capability, and has preliminary regional navigation, positioning and timing capability, with a positioning accuracy of better than 20 m.

3. GLONASS System (Russia)

4. Galileo Satellite Navigation System (EU)

Galileo system with a total investment of 3.5 billion euros of the Galileo program is Europe's independent, independent civil global satellite navigation system, to provide high-precision, high-reliability positioning services to achieve a completely non-military control, management, can be covered by the world's navigation and positioning functions.

Expanded Information

Global Navigation Satellite System (GLONASS), also known as Global Navigation Satellite System (GNSS), is a space-based radionavigation and positioning system capable of providing users with all-weather, 3-dimensional coordinate and velocity, and time information anywhere on the surface of the Earth or in near-Earth space.?

The common systems are GPS, BDS, GLONASS and GALILEO four major satellite navigation systems. The earliest to appear is the United States of America's GPS, the current stage of the most perfect technology is also the GPS system.

With the opening of full service of BDS and GLONASS systems in the Asia-Pacific region in recent years, especially the BDS system is developing more and more rapidly in the civil field. Satellite navigation systems have been widely used in aviation, navigation, communications, personnel tracking, consumer entertainment, mapping, timing, vehicle monitoring and management and automobile navigation and information services, and the general development trend is to provide high-precision services for real-time applications.

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