Four major satellite navigation systems in the world?

GPS, China Beidou satellite navigation system, GLONASS, Galileo satellite navigation system.

1, GPS is the abbreviation of global positioning system in English and "ball position system" in Chinese.

GPS is a new generation of space satellite navigation and positioning system jointly developed by the United States Army, Navy and Air Force in 1970s. Its main purpose is to provide real-time, all-weather and global navigation services for land, sea and air, and it is also used for some military purposes such as intelligence gathering, nuclear explosion monitoring and emergency communication. It is an important part of America's global dominant strategy.

2. China Beidou Navigation Satellite System (BDS) is a global satellite navigation system developed by China.

Beidou satellite navigation system consists of three parts: space segment, ground segment and user segment. It can provide high-precision and high-reliability positioning, navigation and timing services for all kinds of users around the world, and has the ability of short message communication. It has initially possessed the ability of regional navigation, positioning and timing, with positioning accuracy of10m, speed measurement accuracy of 0.2m/s and timing accuracy of10ns.

3.GLONASS is the abbreviation of "Global Navigation Satellite System" in Russian.

The system was originally developed during the Soviet era, and then Russia continued the plan. Russia began to establish its own global satellite navigation system on 1993. The system began to operate in 2007, when only Russian satellite positioning and navigation services were opened. By 2009, its service scope has been extended to the whole world. The main services of the system include determining the coordinates and moving speed information of land, sea and air targets.

Galileo satellite navigation system is a global satellite navigation and positioning system developed and established by the European Union. The plan was announced by Council of Europe in February 1999, and was jointly undertaken by Council of Europe and ESA. The system consists of 30 satellites with an orbital height of 236 16km, including 27 working satellites and 3 backup satellites. The orbit height of the satellite is about 24,000 kilometers, which lies in three orbital planes with an inclination of 56 degrees.

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Beidou chip

20 12 On February 27th, 12, China officially announced the trial operation of Beidou satellite navigation system, which marked that the development of China's autonomous satellite navigation industry entered a brand-new development stage. Among them, the combination of satellite navigation ASIC hardware and domestic application processor has become a major breakthrough of Beidou satellite navigation chip. The processor is developed by local IC design companies in China, with completely independent intellectual property rights, and has been widely used, breaking the situation that foreign processors are widely used in electronic terminal products industry.

Navigation baseband and RF chips used by satellite navigation terminals are the links with the highest technical content and added value, which directly affect the development of the whole industry. In the navigation baseband, it is generally realized by the combination of navigation ASIC hardware circuit and application processor. Most of the previous application processors used foreign companies' ARM processor chip cores and needed to pay foreign ip core licensing fees. At the same time, technology is also subject to people, which can not completely solve the problems of industrial safety and confidentiality.

Through the establishment of major special application promotion and industrialization projects, the localization of Beidou multimode navigation baseband and RF chip has been realized, and China's own application processor has also been widely used in Beidou multimode navigation chip.

Baidu Encyclopedia Global Satellite Navigation System

Baidu encyclopedia GPS system

Baidu Encyclopedia Beidou Satellite Navigation System

Baidu encyclopedia GLONASS

Baidu Encyclopedia Galileo Satellite Navigation System