Gps speed limiter.What are the differences between car GPS positioning system and Beidou satellite positioning

　　The GPS positioning system began as a project by the US military in 1958 and was put into use in 1964. In the 1970s, the United States Army, Navy, and Air Force jointly developed a new generation of satellite positioning system GPS. The main purpose is to provide real-time, all-weather, and global navigation services for the three major fields of land, sea, and air, and to be used for military purposes such as intelligence collection, nuclear explosion monitoring, and emergency communication. It was then known as the Star Wars program. After more than 20 years of research and experiments, it cost 30 billion US dollars. By 1994, 24 GPS satellite constellations with a global coverage rate of up to 98% had been deployed. At present, the GPS positioning system has been fully opened for civilian use worldwide. With its free, wide coverage, mature technology, and all-weather stability, it ranks first in the global satellite positioning system brand. It has been widely used in surveying, positioning, navigation and other fields worldwide.

　　The Beidou Satellite Positioning System is a global satellite positioning and communication navigation system independently developed by China. It can provide high-precision and reliable positioning, navigation, and timing services for various users around the world, 24/7, and 24/7. It also has short message communication capabilities and has preliminary regional navigation, positioning, and timing capabilities. The positioning accuracy is better than 20m, and the timing accuracy is better than 100ns. The entire system design includes 5 geostationary orbit satellites and 30 non geostationary orbit satellites. As of the date of publication, 16 satellites have been in orbit. Positioning covers the Asia Pacific region. It is a mature satellite positioning system following the United States GPS, European Union Galileo, and Russia GLONASS.

　　In terms of application, GPS positioning products have price and coverage advantages over the BeiDou satellite positioning system. As a self-developed global satellite positioning system in China, Beidou satellite positioning has higher security advantages in military and confidentiality levels. At present, China's Beidou satellite positioning system has also been opened for civilian use and advocates for civilian positioning. Unlike some rumors in society, there is no mandatory requirement for the use of Beidou products or a ban on the operation and circulation of GPS positioning products at the civilian positioning level.

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