Gps speed limiter.The world's four major satellite positioning and navigation systems

　　The most mature and widely used satellite positioning system currently is the GPS system in the United States, which has penetrated into various aspects of global economic life. The GPS system was built in the United States in 1994. GPS is a medium range circular orbit satellite positioning system that can provide accurate positioning, velocity measurement, and high-precision time standards for the vast majority of 98% of the Earth's surface.

　　The GLONASS system in Russia had already been implemented during the Soviet era in 1976, but due to financial issues and the disintegration of the Soviet Union, the total number of satellites in orbit for this system is currently 26, of which only 20 are functioning properly.

　　The Galileo system of the European Union is the world's first civilian based global satellite navigation and positioning system. The plan will consist of 32 medium satellites, circular orbit satellites, and two ground control centers. Due to various reasons, the official operation of the Galileo plan has been repeatedly postponed.

　　The Beidou Satellite Navigation System is a navigation system independently designed by China. The Beidou system consists of 5 geostationary orbit satellites and 30 non geostationary orbit satellites, with a positioning accuracy of up to 10 meters. By 2008, the Beidou satellite navigation test system had undergone three satellite launches. Since 2007, seven more satellites have been launched, and the eighth Beidou navigation satellite launch has formed a navigation capability covering the entire Asia Pacific region,

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