The 54th Beidou Navigation Satellite was successfully launched
China News Network Xi'an, March 10 (Reporter Tian Jin correspondent Zhang Hao) At 19:55 on the 9th, the 54th Beidou navigation satellite was successfully launched at the Xichang Satellite Launch Center. The Xi'an Branch of the Fifth Academy of China Aerospace Science and Technology Corporation provided the satellite with payloads such as the navigation subsystem, antenna subsystem, and transponder subsystem, helping the Beidou-3 GNSS network to usher in the match point.
This satellite is the second "Gemstar" of the Beidou-3 global navigation system (commonly known as the GEO satellite, also known as a geosynchronous orbit satellite), and is also a high-orbit satellite that is 36,000 kilometers away from the ground. The satellite with the most powerful functions, the most signals, the largest carrying capacity and the longest life span in the global navigation system No. 3 will cover China and its surrounding areas, and mainly implement functions such as message communication, navigation services, precision positioning, and satellite-based enhancement.
The Beidou-3 global system space segment consists of 30 networking satellites, including three different types of satellites: MEO satellite (medium orbit satellite), GEO satellite (geostationary satellite) and IGSO satellite (tilt geosynchronous orbit satellite).
The Beidou No. 3 team at the Xi'an Branch undertook the development of all payloads of 20 of the 30 Beidou No. 3 satellites, as well as global short message communications, search and rescue and other incremental loads. After the successful launch of "Jixing", Beidou III Global Navigation System is only one star away from its complete completion. The entire payload of the last satellite of the network will also be completed by the Xi'an Branch. By then, the Beidou-3 global navigation system independently developed by China will have the ability to provide services to global users.
In addition to the Beidou III's "Jixing", it is equipped with the same RNSS (passive positioning system) as the MEO satellite, and also has a unique RDSS (radio measurement service) system. Zhang Lixin, deputy chief designer of the Beidou-3 satellite of the Xi'an Branch, introduced that "the RDSS system is the main means of message communication, and the short message function of the Beidou navigation system also mainly depends on GEO satellites." The short message function of the satellite's RDSS system has played a significant role. Compared with the Beidou-1 and Beidou-2 satellites, the performance of the Beidou-3 RDSS system has been greatly improved, which can meet the short message sending requirements of 10 million users in one hour, which provides a reliable guarantee for emergency rapid rescue. .
Atomic clocks have always said "the heart of navigation satellites". The atomic clock plays a role of providing a time reference on the Beidou-3 global navigation system, and its stability is directly related to the positioning, speed measurement and timing accuracy of the navigation satellite. It is a very critical load product on the Beidou-3 satellite. There are two types of atomic clocks in the Beidou-3 global navigation system-hydrogen clock and cymbal clock, both of which were developed by the Xi'an Branch. Among them, Zhongzhong is a mature product that has been fully applied on Beidou-2 satellite, and hydrogen clock is only applied in Beidou-3 satellite. Its long-term stability is 10 times higher than that of Zhongzhong. And on this "Gee Star", it is equipped with two kinds of products that provide time reference: hydrogen clock and chime clock. (Finish)