All in place! The deployment of beidou-3 global satellite navigation constellation ended successfully

 All in place! The deployment of beidou-3 global satellite navigation constellation ended successfully

This is the third geosynchronous orbit satellite of beidou-3 global satellite navigation system (GEO satellite, known as lucky star by Beidou, the Fifth Academy). Although the number of geo series satellites is not large, its role is critical. As a big block stationed in high orbit Tianjiang, the satellite shoulders the responsibility of significantly enhancing the overall technical indicators of beidou-3, and also carries a lot of artifacts to open up land for the operation and application of beidou-3 in orbit.

With the success of the launch, all 30 networking satellites of beidou-3 have been in place, and the deployment of the constellation of beidou-3 global satellite navigation system has been completed.

The satellite was transported to the launch tower. Photo by Nan Yong

Beidou characteristics leap to a new height

Since 1980s, China began to explore the development path of satellite navigation system suitable for national conditions, and gradually formed a three-step development strategy. By the end of 2000, Beidou-1 system will be built to provide services to China; by the end of 2012, beidou-2 system will be built to provide services to the Asia Pacific region. Before beidou-2 officially provided regional navigation and positioning services, the demonstration and verification of beidou-3 global navigation system had begun. On November 5, 2017, the long march 3B launch vehicle successfully launched two beidou-3 global networking satellites, marking the beginning of the deployment of beidou-3 global satellite navigation system constellation.

Beidou-3 global satellite navigation system is composed of MEO satellite, IGSO satellite and GEO satellite, including 24 MEO satellites, 3 IGSO satellites and 3 geo satellites. Compared with the active MEO satellite and elegant IGSO satellite, the Jixing satellite family runs 36000 kilometers away from the earth.

The satellite platform adopted by Jixing is the dongfanghong-3b (navigation) satellite platform developed by the Fifth Academy of Sciences, which is one of the large-scale satellite platforms in active service in China. With strong carrying capacity, the satellite has six abilities of radio navigation, radio measurement, satellite based enhancement, precise single point positioning, power enhancement, time synchronization between stations and positioning, which can provide navigation and enhancement services for users in China and surrounding areas.

The lucky star family follows the most distinctive features of Beidou system, active positioning and short message communication, which is the pioneering work of Beidou System in China. Active positioning, using radio measurement technology, is a unique gene of Beidou. Through the cooperation of two geo navigation satellites, it can not only answer the user where am I, but also tell the interested parties who are concerned about the users whereabouts where are you. It is widely used in search and rescue, fishing and other fields, and it is a clairvoyance to ensure the safety of peoples livelihood. Beidou-3s short message communication ability has been significantly improved, and the information transmission ability has been improved from 120 Chinese characters to 1200 Chinese characters once. In case of emergency, there is no need to weigh words, which is enough to make the plot clear at one time, and can also send pictures and other information, so the application scenarios are more abundant. In addition, the service capacity of beidou-3 is 10 times larger than that of beidou-2. More people can enjoy the inclusive service of Beidou navigation system in the fields of communication, power, finance, surveying and mapping transportation, fishery, agriculture, forestry, etc.

In March this year, after the second GEO satellite of beidou-3 was put in place, the active positioning function of Beidou system under the new system was verified, and the comprehensive upgrade of radio measurement function began. With the entry of one belt, one road, third Jetion, the Beidou three Jetion will open a larger distance on the equator, providing services for the wider area along the one belt and one road. The Beidou characteristics will leap to a new height.

At present, in order to better meet the diversified needs of users, foreign satellite navigation systems will provide characteristic services as the development direction in the next generation system or upgrade design. Chinas Beidou features lead the world and show Chinas great powers responsibility and action!

The picture of beidou-3 satellite in orbit. Drawing provided by the fifth hospital

A masterpiece of localization

As the last finishing star of Beidous global navigation system, the lucky star launched this time adheres to the idea of Beidous research and development, which has been firmly following the road of localization, and is also a masterpiece in terms of localization.

The key core technology is not to come, to buy, to ask for, which is deeply felt by Beidou people of the Fifth Academy on the road of Beidou development. They have experienced the setback of key single machines and components being stuck by some countries, but they have never wavered in their determination to take the road of independent control. Because Beidou people of the five academies know that Beidou is the most important tool of the country, which is related to the modernization of national defense and the development of national economy.

According to Chen Zhonggui, chief designer of beidou-3 satellite of the Fifth Academy of Aerospace Science and technology group, Beidou navigation system provides time benchmark and space location benchmark for national security, social and economic development and peoples life, which has a great impact on the importance of the country and peoples life. As the basic nominal time and space information, if it is provided by others, what is the sense of security? For example, the current hot new infrastructure construction will also be an important direction in the next stage of Chinas construction and development. Time benchmark and space position benchmark are the most important foundation. Beidou navigation system is the foundation of the new infrastructure construction.

Focusing on the country is the core value of Beidou, self-reliance is the backbone of Beidou, and constant innovation is the soul of Beidou.

When asked where it is difficult to build Beidou global navigation system, how to build a high-precision space lighthouse? Who will measure your position? How to maintain stability? And how can multiple satellites work safely and reliably? Xie Jun, deputy chief designer and chief chief satellite designer of Beidou No.3 project of the Fifth Academy of Aerospace Science and technology group, put forward four questions of Beidou soul in plain language.

Long march 3B rocket used to launch beidou-3 satellite. Photo by Gao Nan

Four linked questions involves four aspects: satellite body structure, overall navigation technology, core single machine development, independent innovation and breakthrough. The road of localization is hard to follow. Through the exploration and practice of three generations of Beidou system, we will never lose time and give up a brilliant answer sheet.

Beidou-1 has solved the most basic problems of the satellite, such as the solar sailboard for power supply and distribution, which provides the satellite with components from light to electricity, as well as the rotating mechanism of the control system. The localization of these core products gives Beidou a Chinese physique. Beidou-2 broke the technical blockade of foreign countries, conquered a number of key technologies represented by the overall technology of navigation satellite and high-precision onboard atomic clock, and let the heart of the satellite navigation system beat the heart rate of China. Beidou No. 3 is the first to start the journey from and to the leader. Under the leadership of Xie Jun, Chi Jun, Wang Ping, Chen Zhonggui and other experts, the satellite team of the Fifth Academy of Sciences took the lead in proposing the first international hybrid system of high and medium orbit inter satellite links, forming the inter satellite link network protocol with independent intellectual property rights, independent orbit determination, time synchronization and other system plans, filling the domestic gap; establishing the integration of device component localization from development, verification to application The system has completely broken the situation that the core parts rely on imports and are controlled by people for a long time! Beidou navigation system casts the soul of China.

With independent intellectual property rights and core technology, the localization rate of Beidou navigation satellite single machine and key components has reached 100%. The controllable core technology is the key to the innovation and development of Chinas space industry, which is also the most sincere tribute of Beidou people on the road to the powerful country!

Carefully test the satellite. Photo by Nan Yong

Double test to ensure no hidden danger of satellite

Under the double tests of the epidemic situation and severe quality situation, the satellite test team of the Fifth Academy of Sciences has experienced a special course of launching site. Under the pressure, the Beidou Iron Army has blossomed in high spirits and made every effort to sprint to the end of the global networking battle.

The third lucky star test team went to the launch site on April 2, 2020. In the past two and a half months experience of the launch site, it has the longest continuous time in the field.

In view of the impact of the epidemic, the experimental team planned ahead of time to prepare for and carry out the short-term project in advance. Some of the team members entered the site on February 1 after the Spring Festival and ended the launch of the last lucky star in mid March. In order to better complete the auxiliary line work before the satellite entered the site, they stayed in the launch site and two consecutive missions came down. Half of 2020 has passed. The working rhythm did not slow down due to the extension of time in the launch site, but became more tense. The test team takes the initiative to increase the code, strictly and carefully, and carry out data interpretation and verification over and over again to ensure that there is no hidden danger in the satellite. Although the old Beidou people who have rich mobilization experience stick to the launch site, they generally reflect that the mission of the launch site is the most tiring one. They are highly nervous to review documents, check data, make records and think about plans. In order to leave no hidden dangers and regrets, they have to fight, the team members joked.

For a long time, I have been stationed in the launch site, and my family has taken care of the overall situation. Although I feel sorry for my family, Beidou people have no regrets. Beidou is our child. For the sake of the babys healthy growth, its worth eating more bitterness and suffering more fatigue! This is the common aspiration of Beidou people.

From the launch site of beidou-3, the beginning of the mission, to the holding position of beidou-3, the more adversity it is, the more fearless Beidou Iron Army can be seen. More strict requirements, more detailed work, higher standards, and more rigid work style. The tenacious four changes standard of Beidou iron military ensures that the task of finishing up is foolproof and worthy of the mission of serving the country.

(function(){( window.slotbydup=window .slotbydup||[]).push({id:u6056789,container:ssp_ 6056789, async:true });}) (); source of this paper: surging news editor: Yao Wenguang_ NN1682