China's largest and most advanced communication satellite, Shi Jian 20, completed its core test.

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CCTV news client reported on April 22 that recently, China's largest and most advanced communication satellite, Practice 20, successfully completed all core tests, fully verifying satellite performance and a number of latest technologies. 20 19, 19 On February 27th, Shi Jian-20 satellite was launched by the Long March 5th Tele-3 carrier rocket, fixed in geosynchronous orbit on June 5th, 20 19, and then began on-orbit test.

Li Feng, chief designer of the No.20 satellite of the Fifth Academy of Aerospace Science and Technology Group: We have planned 84 on-orbit test projects of the whole satellite. At present, the important core load test has been completed, and the obtained results are very encouraging, which fully meet our design expectations.

It is understood that Shi Jian 20 satellite has successfully completed the first on-orbit verification of many core key technologies including ultra-high-speed laser communication technology and terahertz technology. Many new products in the field of aerospace technology have also passed the on-orbit test, which indicates that many key technologies, materials and products in China's aerospace field have reached the international leading level. Subsequently, the satellite will carry out long-term on-orbit work in the mode of providing services while testing.

Practice 20: On-orbit Verification of the World's Highest Transmission Rate

One of the core technologies of this practice is ultra-high speed laser communication technology. So what is the concept of this "super high speed"? What does this mean for communication satellites?

The size of "transmission rate" is the most intuitive embodiment of the ability of communication satellites. Before the implementation of Satellite 20, China had verified the super-strong optical communication technology on satellite 13, and the transmission rate at that time was 5Gbps. On the other hand, Practice 20 directly doubles this value to 10Gbps, which is also the highest transmission rate verified in the world at present.

Zhou Zhicheng, commander-in-chief of No.20 satellite of the Fifth Academy of Aerospace Science and Technology Group and academician of China Academy of Engineering: In the future, if movies are downloaded for ordinary people's entertainment, the transmission rate will increase a lot and people's experience will be different. Therefore, we have mastered 10 G laser communication, and we will provide you with many solutions in the manufacture of subsequent application satellites, including putting laser communication and Qualcomm in our LEO Internet constellation.

In other words, this ultra-high transmission rate will greatly change our future life. In fact, since China's first communication satellite "Dongfanghong II", the transmission rate of communication satellites has been continuously improved, and it has also provided people with upgrading services from generation to generation. Based on the practice of Dongfanghong-5 platform, Satellite 20 will further broaden the frequency band of communication transmission, enhance the user experience, and lay the foundation for the future development of Qualcomm Satellite.

Exercise 20: Comprehensive Verification of Electric Propulsion System

In addition to verifying the transmission rate of communication satellites, as a new technology test satellite, Practice 20 also verified the latest electric propulsion technology. In the future, this technology is expected to be widely used in various spacecraft and greatly improve the operational efficiency of satellites.

For high orbit communication satellites, the fixed-point position cannot be changed. Once it deviates from the predetermined position, it is impossible to provide services in the corresponding area. In order to maintain this fixed position, a propulsion system is needed to provide power. In the past, this kind of propulsion system generally used chemical fuel as propellant.

Li Feng, chief designer of No.20 satellite in the Fifth Academy of Aerospace Science and Technology Group, said: We need to carry almost half the weight of the satellite and do a series of work such as on-orbit east-west position protection and north-south position protection. In this case, the weight of the payload carried by our satellite cannot increase rapidly.

And electric propulsion can solve this problem. Satellites no longer need to carry heavy chemical fuel, but a special gas-"xenon", which can be electrolyzed to generate ion flow and form thrust. This propulsion efficiency has reached about ten times that of the past.

Geng Hai, General Manager of Electric Propulsion Division of No.510 Institute of the Fifth Academy of Aerospace Science and Technology Group: If such a large satellite needs chemical propulsion, it may bring nearly three tons of propellant, while we may only bring 200 kilograms of propellant, which is an order of magnitude difference.

According to experts, the material selection of electric propulsion system and the solution of high-voltage electrification in space are world-class difficulties. Nearly 50 years have passed since China began to show its electric propulsion system in 1970s. Practicing the realization of the No.20 technology verification will play an important role in the future development of spacecraft in deep space exploration and other fields.

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