“One Arrow and Two Stars”!Beidou’s global networking goal is one step closer

At 15:22 on December 16, my country successfully launched the fifty-second and fifty-three Beidou navigation satellites at the Xichang Satellite Launch Center in a “one arrow and two stars” method. In the future, Beidou will further integrate with the Internet, Internet of Things, 5G, big data, etc., and usher in a period of rapid development of applications and industries.

China Beidou Satellite Navigation System——

At the end of 2000, the Beidou No. 1 system was built to provide services to China;

At the end of 2012, the Beidou-2 system was built to provide services to the Asia-Pacific region;

Before June 2020, two more satellites in geosynchronous orbit will be launched, and the Beidou-3 system will be fully completed to provide services to the world.

The successful launch of the fifty-second and fifty-three Beidou navigation satellites marks the completion of the deployment of the core constellation of the Beidou-3 global system, laying a solid foundation for global networking. In the past two years, the Beidou system has achieved 18 consecutive launches of 30 satellites, setting a world record for the networking speed of the global satellite navigation system. All-weather, high-precision positioning, navigation and timing services are widely used in transportation, agriculture, forestry, fishery and other fields, producing significant economic and social benefits and changing people’s lives.

So far, all medium-circle earth orbit satellites have been launched, marking the completion of the Beidou-3 global system core constellation deployment, which will further improve system service performance and user experience, and lay a solid foundation for the ultimate global networking.

The deployment of the core constellation of the Beidou-3 system has been completed, providing navigation, search and rescue services for the world

The success of this mission marks the completion of the deployment of the core constellation of the Beidou-3 system and the full realization of Beidou’s global service capabilities, providing global users with navigation services with excellent performance, as well as global short message communication, international search and rescue and other special services.

Wang Ping, chief designer of the Beidou-3 satellite of the China Academy of Space Technology of China Aerospace Science and Technology Corporation, introduced that the two satellites launched this time are medium-circle earth orbit satellites. It is about 12 hours, which is not synchronized with the rotation period of the earth. “From the ground, it moves continuously from west to east and covers the whole world. Therefore, in order to provide global navigation services, it mainly relies on satellites in medium-circle earth orbit. They have therefore become the core constellation of Beidou’s global network.”

The success of this mission also marks the victory of a tough battle. The Beidou high-density networking launch mission, which lasted for two years, has been completed. In 2009, the Beidou-3 project was officially launched. Since the first launch of the Beidou-3 network satellite on November 5, 2017, the Beidou system has achieved 18 consecutive launches of 30 satellites in two years, with an average monthly launch of 1.2 satellites. The world record for satellite navigation system networking speed.

At present, the Beidou-3 global system network has entered the sprint stage of decisive battles. According to the plan, two geostationary orbit satellites will be launched in the first half of next year, and the launch of all networked satellites will be completed half a year ahead of schedule. It is understood that relevant departments have also started the overall demonstration and key technology research of the continuous development of the Beidou system. It is planned to build a comprehensive positioning, navigation and timing (PNT) system with the Beidou system as the core before 2035.

The 100% success rate under high-density launch depends on the persistence and innovation of astronauts

According to Yang Changfeng, chief designer of the Beidou satellite navigation system, the 100% success rate of Beidou-3 networking in a high-density situation is hard-won. Among them, it depends not only on the efforts and innovation of major systems, but also on the persistence of several generations of Beidou people.

The launch vehicle is the basis for carrying out space activities. Every Beidou launch mission is inseparable from the support of the “Beidou Special Train” of the Long March 3A series rockets. As the rocket series with the largest carrying capacity, the most complex technology and the strongest adaptability among the medium-sized high-orbit launch vehicles currently in service in my country, the Changsanjia series of rockets have covered almost all high-orbit spacecraft launch missions in my country. At present, the Changsanjia series of rockets have escorted 57 Beidou satellites into orbit with a total of 42 launch success rates of 100%.

According to Academician Jiang Jie, chief designer of the Long March-3A series of launch vehicles of China Aerospace Science and Technology Corporation, the development team has created a precedent for the launch of high-orbit satellites by “one arrow and two stars”, and the “space shuttle” – ” Expedition No. 1” flew with the upper-level partner and sent the Beidou navigation satellite directly into the working orbit. This technological innovation has contributed to saving energy and extending the working life of satellites, and has also greatly accelerated the construction progress of the Beidou project and greatly reduced the construction cost.

From Beidou-1 to develop one star in a few years, to Beidou-2 to develop 15 stars in 3 years, and then to Beidou-3 to develop 20 stars in parallel in 3 years; Thousands of sets… At the China Academy of Space Technology of China Aerospace Science and Technology Corporation, such a speed benefits from continuous innovation.

All Beidou satellites are launched at the Xichang Satellite Launch Center, known as the “Beidou Port”, which is also a solid backing for the efficient networking of the Beidou system. In 2019, the Xichang Satellite Launch Center continued high-density launches and undertaken a total of 13 space launch missions, creating the transition of the next rocket on the day of launch, the state transition of the same launch station in only 7 days, and the presence of 5 stars, 2 arrows and 2 upper stages at the same time. Historical records such as tests, 97 positions and more than 3,000 operations for each task are accurate.

“Don’t let the test parameters fail, don’t let it go if there are problems with the performance of the equipment, don’t let it go if there are doubts in the test results, and don’t let it go if there is a fault…” Wang Zemin, deputy director of the Xichang Satellite Launch Center, said that the launch center has been practicing the these behavioral concepts. At the same time, the launch center has established an integrated management system for quality, environment and occupational health and safety in accordance with international standards, and adopts scientific, systematic and standardized management of the center’s space launch and related services, effectively improving the capabilities of the entire launch site and providing services for mission execution. strong guarantee.

The reporter met many front-line personnel at the launch site, and their perseverance was impressive. When the launch was successful, Bai Chunbo, who served as the “01 Commander” of the Changsan A series of rockets for the second time, was relieved. He, who has participated in more than 110 missions, told reporters that in comparison, the Changsanjia series rocket launch missions involved more systems, stricter organization and coordination, and many unprecedented challenges. “Now, our launch organization and command model Mature, stable and reliable equipment and facilities, complete system of post documents, and enough confidence to ensure the success of the mission.”

The post-90s Yu Xinchen is the commander of the low temperature power system of the launch vehicle of the Xichang Satellite Launch Center and the youngest sub-system commander of the Xichang Satellite Launch Center. He has been dealing with liquid hydrogen and liquid oxygen low-temperature propellants all the year round. It is an item known as “the energy of a grain of rice falling from a height of one meter will cause an explosion”, and a slight leakage will cause unpredictable consequences. In order to ensure airtightness, Yu Xinchen not only became a “living blueprint” in the eyes of people through hard training, but also developed the skill of “audio leak detection”. Yu Xinchen said that he hoped that he would have the opportunity to become a “01 conductor”. “’01’ is equivalent to the command center of the launch site. It is the big housekeeper of the command center. To be able to take this position is not only an affirmation of ability, but also an honor.”

Wang Zemin said, just like the huge slogan standing at the launch site, “Screw is connected to the aerospace industry, and small buttons maintain the dignity of the nation.” cause.

Autopilot, unmanned harvesting, disaster warning, all have the Beidou system

The transportation field is the key area for the large-scale application of Beidou. In the countryside, the Beidou positioning system, voice station announcement system, and “anti-fatigue, anti-collision” active safety defense system are installed on the buses connected to villages, which are networked with the Beidou dynamic monitoring center of the “buses to villages” to protect the safety of passengers in real time. Autopilot technology is inseparable from high-precision positioning and navigation, ranging from autonomous parking to the interaction of intelligent port automation and port machinery equipment, all of which are “embedded” with Beidou high-precision equipment.

No one is harvesting, no transplanting, no unloading… Beidou is being used in various processes of agricultural production to create smart agricultural machinery and even smart agriculture. Based on the Beidou satellite navigation system, the harvester system composed of unmanned harvesters and unmanned grain unloading vehicles can realize the automation of the grain harvesting process. The tractor equipped with Beidou automatic driving equipment pulls the precision seeder, which can make the seeding uniform, the depth is consistent, and the seedling emerges neatly, saving time and effort.

In terms of disaster prevention and mitigation, not long ago, the real-time monitoring of the high-precision Beidou monitoring system was used to successfully issue early warning information to a loess landslide in Yongjing County, Gansu Province, avoiding casualties and property losses. In terms of maritime search and rescue, the Ministry of Transport has cumulatively promoted more than 400,000 sets of Beidou alarm equipment to sea-related users, which has significantly improved the search efficiency of objects in distress at sea and reduced the number of casualties at sea. Using the Beidou disaster reporting terminal, you can receive the disaster warning broadcast information sent by the Beidou satellite. Once a major natural disaster such as floods, ice and snow, earthquakes occurs, and the telecommunications and power supply systems are interrupted, the disaster information personnel can use this system for the first time. to report a disaster or call for emergency help.

Beidou also gradually entered daily life. Real-time monitoring of Beidou positioning is used for gas inspections; outdoor Beidou satellite navigation system rescue alarms are installed for smart pensions; Fully monitor the operation trajectory of the snow removal and ice shovel to achieve efficient snow removal…

With the continuous acceleration of the Beidou system’s networking progress, by providing all-weather, all-day, high-precision positioning, navigation and timing services, the Beidou system is widely used in transportation, agriculture, forestry and fishery, weather forecasting and other fields. While producing significant economic and social benefits, it also changes people’s lives.

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