China completed the launch of the Beidou three basic system.

China completed the launch of the Beidou three basic system.

Xinhua News Agency, Xichang, Nov. 19, Title: Relevant person in charge of Beidou System explains in detail that China has completed the closing Double-satellite launch of Beidou 3 basic system.

Li Guoli, Fan Yongqiang, Deng Meng

On November 19, China successfully launched two Beidou-3 global networking satellites. Since then, the deployment of Beidou-3 basic system constellation has been completed, taking a "key step" from regional to global. To this end, the reporter interviewed the chief designer of Beidou Satellite Navigation System and the relevant system leaders.

General manager of Beidou System: at the end of the year, the "one belt and one way" country and region will serve the whole world in 2020.

The two satellite launched is the eighteenth, nineteenth Beidou three network satellite. Yang Changfeng, chief designer of the Beidou satellite navigation system, said that after the orbit of the satellite, the 17 Beidou three satellites that had been launched will be evaluated in conjunction with the harmonization of the performance indicators. The plan is scheduled to open and run at the end of this year to provide basic navigation services to all countries and regions along the way.

"This shows that the deployment of the basic system constellation of Beidou III has been completed, and that Beidou has taken a key step from domestic to international and from regional to global." Yang Changfeng said.

In 2009, Beidou No. 3 project was officially launched and networking was implemented in three steps: the simplest system, the basic system and the global system. "At present, the construction is progressing smoothly." Yang Changfeng said that by the end of 2020, a global system composed of more than 30 Beidou navigation satellites will be built with global service capabilities.

Launch vehicle system: gold medal rocket high standard "ten to send big dipper"

This launch is the 10th successful delivery of the Beidou by the Long March 3A rocket series and the 291st flight of the Long March rocket series.

Cen Zheng, commander-in-chief of Changsanjia series launch vehicles, introduced that in order to meet the requirements of Beidou 3 global networking, they have made 403 technological improvements in recent years, with an average of 28 technological improvements per rocket. All launches have been successful and become a truly "Beidou Special Train".

"This year, an average of about 26 days to complete a launch mission, the next three years are expected to carry out about 40 launch missions." Liu Jianzhong, Deputy commander-in-chief of Changsanjia series launch vehicles, said that in the face of challenges such as high-density launching, Changsanjia rocket development team gradually replaced customization with "de-mission". That is, single-stage rocket and single-launch rocket can flexibly adjust their launching tasks after completion of the assembly, as long as the satellite and rocket interfaces remain. Consistent, for specific tasks, as long as the software can be adjusted.

"Implementing the"de-mission"design greatly improves the adaptability of the rocket, and the rocket state is relatively stable." Liu Jianzhong said.

Satellite system: all components of Beidou three are made domestically.

In the year since the launch of the first binary satellite in November last year, China has deployed 19 Beidou-3 networking satellites in space, which fully demonstrates that the comprehensive development capability of China's spacecraft has reached the advanced level in the world.

"Beidou 3 set the service precision design target on the design index of the third generation GPS navigation satellite and Galileo navigation system that had not yet been launched at the beginning of the prototype design." Xie Jun, deputy director of Beidou 3 project and chief designer of Beidou 3 satellite in the 5th Academy of Aerospace Science and Technology Group, revealed.

Heavy equipment must be controlled independently. Xie Jun said that in the preliminary demonstration of Beidou No. 3, they clearly put forward the goal of localization and self-control of components and components, and scientifically formulated implementation plans, and made every effort to implement them.

"Nowadays, all components used in the Big Dipper three satellite have been nationalized." Xie Jun said.

Wang Ping, chief designer of Beidou-3 satellite of the Fifth Academy of Sciences, said that as an important epitome of Beidou system engineering, localization has great impetus and traction effect on China's basic industry. At the same time, the progress of the national industrial foundation also ensures the development of Beidou project. The two promote each other and fully demonstrate China's comprehensive strength. And innovative ability.

Launch site system: take measures to ensure high density launch.

On October 31, 2000, China's first Beidou navigation test satellite was successfully launched at Xichang Satellite Launch Center.

"In the 18 years since then, 47 Beidou navigation satellites, including four experimental satellites, have flown from here to space with a success rate of 100 percent," said Zhang Xueyu, director of the center.

The Beidou Double Satellite Launch Mission, just implemented in the early morning of November 19, is the 35th Beidou Navigation Satellite Launch Mission carried out by Xichang Satellite Launch Center. Since its first mission in 1984, the center has sent more than 130 domestic and foreign spacecraft into space.

Zhang Xueyu said that since this year, the center has been facing difficulties, effectively responding to the challenges of simultaneous test and alternate launching of three arrows and multiple satellites, strengthening overall work, strengthening quality control, strengthening risk prevention and control, ensuring smooth operation of one node, accurate operation at a time, and successfully completed 10 Beidou navigation satellites. Launch mission.

"Up to now, the center has successfully completed 15 launches this year, breaking the record of 9 launches a year, and will carry out 2 missions before the end of the year." Central Party committee secretary Dong Zhongqing said.

From 2019 to 2020, China will launch six Beidou-3 MEO satellites, three Beidou-3 IGSO satellites and two Beidou-3 GEO satellites. Dong Chongqing said that the center will carefully organize, precisely command, precisely operate, and strive to ensure that the mission is foolproof, so as to make greater contributions to building a strong aerospace country.

Measurement and control system: precision measurement, excellent control, and animal husbandry

In the early morning of November 19, after the separation of Beidou binary satellite and Long March rocket, the test of Xi'an Satellite TT&C Center has just begun.

"If the rocket launches the satellite successfully, we will take the baton from the launch site, because if there is no accurate measurement and control, the satellite just launched is like a kite with a broken line, let alone provide navigation services for users." Gao Ning, head of the Beidou project team of Xi'an TT & C center, Sanya satellite measurement and control center, said.

Since the launch of Beidou 3 in November 2017, the "Herdsmen" of Xi'an Satellite TT&C Center has securely escorted 19 Beidou networked satellites to the predetermined orbit, laying the foundation for Beidou Navigation Satellite to maximize its effectiveness and provide precise navigation services.

At present, the scientists and technicians of the long-term spacecraft Management Department of Xi'an Satellite TT&C Center have taken 20 days to "check-up" dozens of Beidou navigation satellites in orbit one by one. They have established detailed health checklists for each satellite, checked key telemetry parameters of satellite cycle, summarized the abnormal characteristics of satellites in the past, and analyzed the satellite on-board regularities. The failure is affected, and the health inspection and analysis report is formed.

"It is our glorious mission to protect these valuable national space assets with high risk and investment in space industry." Director Xu Binglin said. (Wang Yulei, Wang Weitong, Pan Chen, Lv Binghong participate in writing)


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