At the 8th China Satellite Navigation Academic Annual Meeting held on May 23, the director of the China Satellite Navigation System Management Office, Yan Chengqi, revealed that China has fully launched the third step of the Beidou system, namely the Beidou No.3 system, which will be launched in the second half of this year. ~8 global networking satellites.
This means that starting from the second half of this year, China Beidou Satellite will officially start global networking and open the curtain of Beidou system for global service.
Next, the launch of 18 Beidou satellites around 2018 will be staged. Qi Chengqi said that this will be the first to provide basic services for countries along the “Belt and Roadâ€. By 2020, China will build a world-class global satellite navigation system and eventually form a global service capability.
At the academic annual meeting of the day, Harold Martin, director of the National Space-based PNT Coordination Office, mentioned that GPS has been developed to the fifth-generation satellite. The satellite network includes 36 satellites, 31 of which provide navigation signals every day. Its signal accuracy has reached between 45.3 cm and 70.3 cm.
Moreover, the navigation performance of GPS is still increasing. Harold Martin said that at present, the first star of the new generation GPSIII global positioning system, SV01, has been put into storage, and SV02 and SV03 have been assembled one after another. It is planned to start launching in March 2018.
In contrast, China's Beidou system, as well as Europe's Galileo system, is still in a "catch-up" position. In fact, there is a global satellite navigation system (GNSS) club in the world, with only four members, namely the US GPS, the European Galileo GALILEO, the Russian GLONASS GLONASS and the China Beidou.
Among them, China’s Beidou started at the latest. Qi Chengqi told reporters that in the late 20th century, China began to explore the development path of satellite navigation systems suited to the national conditions and gradually formed a "three-step" development strategy.
The first step is to build the Beidou satellite navigation test system at the end of 2000, namely “Beidou No.1†to provide services to China;
The second step is to build a satellite navigation system operated by 14 satellites and 32 ground stations in the world at the end of 2012, namely “Beidou No. 2†to provide services to the Asia-Pacific region;
The third step is to build a Beidou global satellite navigation system consisting of five geostationary orbit satellites and 30 non-geostationary orbit satellites around the year 2020, namely the “Beidou IIIâ€, providing services to the world.
At present, the first two steps have been achieved, which also makes China the third country in the world with autonomous satellite navigation systems after the United States (GPS) and Russia (GLONASS). So, what is the current level of China’s Beidou?
At the annual meeting, Wang Li, chairman of the China Satellite Navigation System Committee, said that Beidou system has provided stable and reliable space-time information services for users in the Asia-Pacific region. 15 satellites are in stable operation in the orbit. Five new Beidou satellites have completed on-orbit debugging. , I am about to work in the network.
Qi Chengqi revealed it more detailed. He said that compared with Beidou No. 1, the performance of Beidou No. 2 system has risen steadily. In 2016, two on-orbit backup satellites were launched, which improved the positioning accuracy from 10 meters to 8 meters. With the official launch of China's self-developed "meter-level rapid positioning Beidou chip", the application of Beidou system has officially entered the "meter-level positioning era."
Yang Changfeng, chief designer of China Beidou satellite navigation system, said on the same day that the Beidou No.3 system has increased the service signal with better performance, higher interoperability with other system signals and better user experience, based on the Beidou No.2 system. With the higher precision of the on-board atomic clock and inter-satellite link technology, the high-precision spatio-temporal information service capability will be greatly improved.
Qi Chengqi also mentioned that the second phase of the Beidou Ground Augmentation System will be completed in 2018, and the metering accuracy of the meter-level and decimeter-level positioning in the main areas of the country, as well as the cm-level correction of the encrypted coverage area and the post-processing millimeter-level correction number will be carried out. These are expected to further improve the accuracy of the Beidou system.
It is worth mentioning that the speed of “legalization†of China’s Beidou’s international identity is also accelerating. Qi Chengqi said that since the last year, after the Beidou system obtained the legal status of international maritime applications, significant progress has been made in the field of Beidou International Maritime Standards. In March of this year, the multi-system shipborne receiver standard compatible with GPS, Beidou and GLONASS was passed.
Qi Chengqi said that at present, Beidou has completed 26 international standards development work in the field of mobile communications. Under its leadership, Beidou has achieved a penetration rate of 25% in China's mobile communications field. He said, "With the development of the Beidou global system, Beidou will have unlimited possibilities in the era of the Internet of Everything."
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