According to the Voice of China report, in 2017, China plans to launch six communication satellites, such as No.13, Zhongxing 9A, and Practice No.18. Among them, the practice of the 13th will be launched in April this year. At present, there are as many as 24 communication satellites in orbit operated by China on a global scale.
With the improvement of China's new generation of communication satellite technology, while completing the task of broadcasting and television signal transmission, in the future, it will become a reality by using communication satellite coverage, in the aircraft cabin, on high-speed railways running at high speed, and even in remote mountainous areas.
In last year's Rio Olympic Games in Brazil, when the audience did not leave the house and saw the Chinese women's volleyball team at the other end of the globe win, the communication satellite was working silently in the universe. Zhou Zhicheng, Minister of the Communications and Satellite Division of the China Academy of Aerospace Science and Technology, said: "The people do not realize what the satellites have done. Once they have a problem, they will realize that, for example, the national radio and television transmission, if there is a breakdown, there will be no TV signal. It is."
The transmission of broadcast television signals is one of the important tasks of communication satellites. This year, China plans to launch six communication satellites, such as No.13, Zhongxing 9A, and Practice No.18. Among them, in April this year, the implementation of the 13th satellite will be first launched by the Long March 3B carrier rocket at the Xichang Satellite Launch Center. Wang Min, deputy chief of the 13th satellite, said that the practice of the 13th is China's first high-throughput communication satellite, the first application of the Ka-band multi-beam broadband communication system. After the completion of the test verification, the satellite will be included in the "Zhongxing" series, named "Zhongxing 16". The 'pass' of high-throughput satellites is the 'pass' of communication. It is also called high-pass satellite, meaning that the communication capacity has one or two orders of magnitude higher than the previous satellites. The maximum total communication capacity exceeds 20 Gbps, which exceeds the total capacity of all communication satellites developed in China before.
The expansion of satellite communication capacity means that the transmission capacity is stronger. For example, Wang Min said that the original communication satellite can transmit seven or eighty sets of standard-definition television programs at the same time. Now it can simultaneously transmit seven or eighty sets of high-definition television programs, and in the future, it can simultaneously transmit a larger number of 4K programs.
Many listeners have the experience that mobile phone signals will be intermittent on high-speed trains running at high speeds, and mobile phones cannot be used in the cabin of the aircraft, or there is no cell phone signal in remote mountainous areas. This is because mobile base stations are unlikely to achieve full coverage. Wang Min said that communication satellites can solve this problem. "The most intuitive feeling is that the original service is for broadcast TV, backbone network government users, enterprise users, large users, and now can serve ordinary personal users, such as carrying a wifi adapter, you can put satellite signals It will become a wifi, and in the future, places like the aeronautical communication, high-speed rail and other ground coverage networks will not be able to supplement it well."
In addition, the implementation of the 13th satellite is China's first high-orbiting satellite using electric propulsion technology, its on-orbit life is 15 years. Wang Min introduced that this is the first time that China has used electric propulsion to complete the north-south position maintenance of the satellite during its full life. It is a revolutionary technological breakthrough for China's high-orbit satellites. Electric propulsion is an advanced propulsion technology, and its specific impulse can reach More than 3,000 seconds, more than 10 times the conventional chemical propellant. The benefit is that the amount of propellant carried by the satellite can be significantly reduced. Originally, a satellite required 3 tons of chemical propellant. After electric propulsion, only 300 kg of propellant is needed at the theoretical limit. This is very important for satellite weight reduction and increasing the payload capacity of the payload.
According to the plan, after the launch of the 13th satellite, China will launch the implementation of the No.18 satellite in the middle of this year, which will make China truly a "club" of world-class communication satellites. Zhou Zhicheng said that after a number of satellites are in orbit, the mobile communication satellite system built in China will provide better applications.
Zhou Zhicheng said that let the people get benefits, such as mountain climbing or natural disasters. Where is China's satellite communication? Everyone only knows that the "Beidou System" provides short message service during the Wenchuan earthquake. If the government is equipped with the Tiantong system application, there will be an emergency and it will be emergency.
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