President Xi Jinping announced on Friday that China's Beidou Navigation Satellite System has been completed and has started providing full-scale global services that day.

Xi, who is also general secretary of the Communist Party of China Central Committee and chairman of the Central Military Commission, declared the commissioning of the global navigation and positioning system's third-generation network at a ceremony at the Great Hall of the People in Beijing.

General Zhang Youxia, vice-chairman of the Central Military Commission, read a congratulatory letter at the ceremony on behalf of the CPC Central Committee, the State Council and the top military commission, calling the commissioning of Beidou's full-scale global service a significant milestone in China's efforts to boost science and technology and strengthen its space industry.

The letter also said the move is a major contribution to the global public-service infrastructure as well as a remarkable strategic achievement of socialism with Chinese characteristics in the new era.

Beidou is the country's largest space-based system and one of four global navigation networks, along with the United States' GPS, Russia's GLONASS and the European Union's Galileo.

"Beidou is the fruit of the determination and planning by the Party and the central government, of the concerted effort of numerous people involved in the program and of the enormous support from the Chinese people," Yang Changfeng, Beidou's chief architect, said on Friday.

More than 300,000 scientists, engineers and technicians from more than 400 domestic institutes, universities and enterprises have been involved in Beidou's development and construction. Dozens of distinguished scientists from the Chinese Academy of Sciences and the Chinese Academy of Engineering have taken part in the program, he said.

In late June, the final satellite to complete Beidou's third-generation network was lofted by a Long March 3B carrier rocket at the Xichang Satellite Launch Center in Sichuan province and placed into a geostationary orbit about 36,000 kilometers above the Earth.

After in-orbit tests over the past month, the satellite, the 59th in the Beidou family and 30th in the third-generation series, recently started its formal operations, according to the China Satellite Navigation Office.

Since 2000, 59 Beidou satellites, including the first four experimental ones, have been launched from Xichang on 44 Long March 3-series rockets, with some of them having been retired.

Beidou began providing positioning, navigation, timing and messaging services to civilian users in China and other parts of the Asia-Pacific region in December 2012. At the end of 2018, it started providing basic global services.

Now, there are 30 third-generation Beidou satellites in three types of orbit-24 in medium-Earth orbit, three in inclined geosynchronous satellite orbit and three in geostationary orbit.

Some second-generation Beidou satellites are in operation offering regional services, according to the China Satellite Navigation Office.

Compared with second-generation satellites, third-generation models feature higher accuracy and stability, a clearer signal and more state-of-the-art technologies such as inter-satellite links, satellite-based augmentation and global emergency search capability, said Chen Zhonggui, chief designer of the third-generation satellite at China Academy of Space Technology.

Chen said the new generation is 10 times stronger than the second generation in terms of overall service capability.

Next, China will continue improving the system's capabilities and services, the office said.

Aside from space-based assets, Beidou has a vast ground-based network that includes dozens of stations, more than 200 subsystems and over 30,000 sets of equipment.

Timeline:
1983 - Renowned Chinese scientists, headed by Chen Fangyun, propose to build an experimental two-satellite positioning system.

1989 - The concept of the experimental system is demonstrated and verified by two Chinese communications satellites operating in orbit.

February 1994 - The government approves and starts the research and development of a space-based navigation and positioning system, aiming to mitigate the country's heavy reliance on foreign networks. The system is named "Beidou".

October 2000 - China launches the first Beidou satellite. In December that year, the second Beidou satellite lifts off to join the first one to establish an experimental system. In May 2003 and February 2007, another two experimental satellites lift off to join the trial run.

April 2007 - Beidou's first mass-production satellite, also the first in its second-generation series, launches.

December 2012 - Beidou starts providing positioning, navigation, timing and messaging services to civilian users in China and other parts of the Asia-Pacific.

November 2017 - The first two third-generation Beidou satellites are launched.

December 2018 - Beidou begins providing basic global services.

June 2020 - The final satellite to complete the third-generation Beidou network launches.

July 2020 - Beidou starts providing full-scale services.

Source: Xinhua News Agency

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