18 satellites to launch for BDS by 2018
China on Thursday vowed national efforts to complete its Beidou satellite navigation system to serve global users by 2020, with priority going to countries involved in the new Silk Road initiative.
The current goal of developing China's BeiDou Navigation Satellite System (BDS) is to "provide basic services to countries along the land and maritime Silk Roads and in neighboring regions by 2018, and to complete the constellation deployment of 35 satellites by 2020 to provide services to global users," said a white paper released Thursday by the State Council Information Office.
A "globalized" BDS would have "positive and practical significance" in terms of connectivity around the globe, especially the interconnection between China and Southeast Asian countries under the Silk Road plan, known as the Belt and Road initiative, Huang Jun, a professor at the School of Aeronautic Science and Engineering at Beihang University, told the Global Times on Thursday.
In line with the Belt and Road initiative, China will jointly build satellite navigation augmentation systems with relevant nations and promote international applications of navigation technologies, the white paper states.
To fulfill the 2018 goal, the country plans to launch some 18 satellites for the BDS by 2018, Ran Chengqi, BDS spokesperson, told a press conference on Thursday.
"In priority Chinese cities such as Beijing and Urumqi in Northwest China's Xinjiang Uyghur Autonomous Region, as well as low latitude countries like Thailand, the BDS is capable of offering a positioning accuracy of better than five meters," said Ran, who is also director of China's Satellite Navigation System Management Office.
Since 2015, the country has sent up seven more satellites into space in support of the BDS, including five navigation satellites and two backup satellites, Ran added, citing Sunday's launch of the BDS' 23rd satellite - a backup satellite - as an example.
In 2020, the BDS might offer different positioning accuracy choices and could provide centimeter-level accuracy under certain requirements, said Lu Weijun, a BDS expert at Beijing University of Posts and Telecommunications.
Unique features
Despite being a late starter compared with the U.S.-developed GPS, China's BDS has unique features, Huang said, citing the BDS short-message communication service as an example.
"The short-message communication service is mainly useful in places with insufficient ground and mobile communication capabilities, such as deserts, seas and disaster areas where communication facilities have been destroyed," Lu told the Global Times.
More than 40,000 fishing vessels along China's coastline have been equipped with the BDS application terminals, Ran said, adding that they also provided better communication for islands near the coastline.
The BDS short-message communication service is mainly handled by five Geostationary Orbit (GEO) satellites, Lu said. Located above China, the five GEO satellites mainly serve a coverage area of Chinese territories and the Asia-Pacific region" and "could be used to locally enhance the signal in wartime, when other satellites might have been closed."
An independently designed global navigation and positioning network would also contribute to national security, Huang said.
Industrial chain
China is developing chips, modules and other basic products based on the BDS and other compatible systems, and fostering an independent BDS industrial chain, the white paper noted.
"By the end of April, the BDS technology has been applied to more than 24 million terminals and over 18 million mobile phones," Ran said.
It is expected that by the end of this year, up to 50 million mobile phones will have been installed with domestic chips that will be compatible with three satellite navigation systems, namely the BDS, GPS and Russia's GLONASS, Wang Hansheng, vice president of Olink Star, a Beijing-based company that makes navigation satellite system products, told the Global Times.
