China Beidou satellite navigation system is a global satellite navigation system developed by China, and it is the third mature satellite navigation system after GPS and GLONASS. 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, and has initially possessed the ability of global navigation, positioning and timing.
Satellite navigation system is a global public resource, and multi-system compatibility and interoperability have become the development trend. China always upholds and practices the development concept of "Beidou in China, Beidou in the world", serves the construction and development of the Belt and Road, and actively promotes the international cooperation of Beidou system.
Brief introduction of Beidou satellite navigation
China's Beidou navigation satellite system has gone through three generations. The first generation adopted the double-star positioning system, that is, ground users sent requests to Beidou navigation satellite, and Beidou navigation satellite provided positioning services for users through double-star positioning. The disadvantage of this method is that users need to send information to the satellite actively, and the number of users is limited in the whole process. Its advantage is that we only need two satellites to provide such navigation service.
Since the second generation of Beidou in China, the navigation mode similar to American GPS, Russian GLONASS and European Galileo has been adopted, which is completely passive, that is, the user's receiver does not actively send out radio signals.
On this basis, Beidou III has expanded from a regional navigation system to a system that can cover the whole world and provide navigation services for users all over the world.