At 20:29 on the 25th, the "Long March 3B/Expedition No. 1" carrier rocket carrying two new Beidou navigation satellites was launched at the Xichang Satellite Launch Center.
According to Xinhua News Agency, China successfully launched two Beidou navigation satellites on the 25th, increasing the total number of satellites in the Beidou navigation system to 19. This pair of "Double" brothers of Beidou will assume the "pioneer" mission for Beidou Global Network.
According to Xie Jun, chief designer of Beidou Navigation Satellite System, as the main satellite of Beidou system global network, the newly launched Beidou Double Star will carry out comprehensive verification for China to build a global navigation satellite system, laying the foundation for the subsequent global networking satellite.
Xie Jun said: "The first thing that this pair of stars must bear is to verify the overall plan and technical system of the global satellite navigation system. In terms of signal format, this time, a new signal format with independent intellectual property rights is adopted, and the navigation signal data is The regional network navigation satellite has more than doubled on the basis of this. This means that the same time, the navigation satellite can send more signals to better meet the user's needs."
Experts say that the "brothers" should verify their ranging and anti-interference performance. In addition, they will also verify the first inter-satellite link technology used in space, and will implement inter-satellite interconnection with a Beidou satellite launched in March this year to jointly carry out global network test verification.
The two satellites will also take the lead in detecting the electromagnetic and space environment faced by global navigation satellites, monitoring the interference signals of navigation satellites, providing anti-interference performance design basis for satellites, and accumulating solid data for subsequent satellite development.
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98% of Beidou Nova's parts are made in China
China's Beidou navigation satellite system implementation of the "three-step" strategy: the first step, the Beidou test navigation satellite system was built in 2000; the second step, the regional navigation system was built in 2012; the third step, built around 2020 A global Beidou satellite navigation system consisting of five geostationary orbit satellites and 30 non-geostationary orbit satellites.
At present, the first two steps have been realized. China has become the third country in the world with an autonomous satellite navigation and positioning system after the United States and Russia. The two Beidou navigation satellites launched by China have undergone a reinvention change compared with the previous Beidou satellites. The localization rate of components has increased to 98%. The key components such as “heartâ€, “brain brain†and “iron bone†are all “ China's intellectual creation."
According to the introduction of the Fifth Academy of China Aerospace Science and Technology Corporation, the design life of the 18th and 19th Beidou navigation satellites launched on the 25th has increased from the previous 8 years to 12 years. The new technologies and products used in these two satellites account for nearly 80% of all satellite products, which is unprecedented in satellites previously developed in China.
A cesium atomic clock is a typical example. The cesium atomic clock is known as the "heart" of the satellite navigation and positioning system and is one of the main factors determining the performance of the positioning system. After several years of research and development, the Xi'an Branch of the Fifth Hospital and the 510 have successively solved the problems of the life and long-term stability of the Cuckoo Clock and developed the first cuckoo clock in China.
Xie Jun said that the high-precision cuckoo clock is the core equipment for the newly launched Beidou double-star payload. Compared with the previous, the positioning, ranging and timing of the new generation of high-precision choppers are more precise and provide more accurate positioning services.
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