The BeiDou Navigation Satellite System (BDS) is a global satellite navigation system developed by China. It is the fourth mature satellite navigation system after the United States Global Positioning System (GPS), the Russian GLONASS navigation system (GLONASS), and the Galileo satellite navigation system.
The Beidou satellite navigation system consists of three parts: space segment, ground segment and user segment. It can provide high-precision, high-reliability positioning, navigation and timing services for all kinds of users all round the clock and all day in the world, and has short message communication. Capability, has initially possessed regional navigation, positioning and timing capabilities, positioning accuracy of 10 meters, speed measurement accuracy of 0.2 m / s, timing accuracy of 10 nanoseconds.
On November 5, 2017, China's third-generation navigation satellite was successfully launched. It marked the official start of China's construction of the Beidou global satellite navigation system.
At 7:52 on August 25, 2018, China successfully launched the thirty-fifth and thirty-sixth units with the "One Arrow and Two Stars" method at the Xichang Satellite Launch Center with the Long March III B carrier rocket (and the expedition No. 1 upper level). Beidou navigation satellite, two satellites belonging to the medium-circle earth orbit satellite, is also the eleventh and twelfth networking satellites of the Beidou-3 global system in China. At 22:07 pm Beijing time on the 19th, China used the Long March 3B carrier rocket and the expedition No. 1 upper level at the Xichang Satellite Launch Center to successfully launch the 37th and 38th Beidou navigation satellites in a “one arrow and double star” manner. These two satellites belong to the medium-circle earth orbiting satellite and are the 13th and 14th satellites of the China Beidou-3 global system. On the two Beidou navigation satellites, the International Search and Rescue Organization standard equipment was also installed for the first time, which will provide distress alert and location services for users around the world.
On November 19, 2018, the 18th and 19th satellites of the Beidou No. 3 system were launched. China successfully completed the constellation deployment of the Beidou No. 3 basic system.