Mobile phones can make satellite calls, and the satellite system behind it in China is not ordinary
2023-09-15
The world's first Volkswagen smartphone to support satellite calls, the Huawei Mate 60 Pro, has recently been launched. The "mobile age" of satellite mobile communication has arrived, and the "behind the scenes hero" who provides users with voice, data and other satellite communication services is China's independently developed Tiantong 1 satellite system. At present, the effectiveness evaluation of the satellite system in orbit is ongoing, and communication services will be evaluated and the potential of the system will continue to be explored. The Tiantong 1 satellite system was developed by the Fifth Academy of China Aerospace Science and Technology Group, and its primary task is to achieve emergency communication in the event of severe natural disasters in China. On August 6, 2016, the first satellite of China's S-band high-capacity geosynchronous orbit mobile communication satellite, Tiantong-1 01, was successfully launched, achieving a breakthrough in China's mobile communication satellite zero. Its successful launch marks China's entry into the era of satellite mobile communication, filling the gap in national civilian and commercial autonomous satellite mobile communication services. Subsequently, the Tiantong 1 satellite system officially provided services to society. Tiantong satellite has played an important role in emergency communication environments such as the 7.0 earthquake in Jiuzhaigou Valley Scenic and Historic Interest Area County, Aba Prefecture, Sichuan Province, and the landing of typhoon "Shanzhu" in China. The image of the launch of the Long March 11 rocket at sea was also transmitted through the Tiantong satellite signal. From 2020 to 2021, the 02 and 03 satellites of Tiantong 1 were launched and launched one after another. After the successful networking and operation of the 03 and 01, 02 satellites, full coverage of the Asia Pacific region has been achieved, greatly expanding the voice and data communication coverage of various handheld and small mobile terminals in China's territory and surrounding waters. It can meet the diverse communication needs of more civil and commercial users, providing 24/7, 24/7, stable and reliable mobile communication services such as voice, short message, and data. In addition to disaster rescue, maritime rescue, and remote area rescue in emergency communication, communication satellites can also achieve functions such as remote education, remote medical treatment, broadcasting, and live broadcasting; In terms of commercial communication, it can provide internet access, personal mobile communication, and other services for high-end commercial users such as scientific research and exploration. According to experts from the Communication and Navigation Satellite General Department of Aerospace Science and Technology Group, the terrain covered by the Tiantong 1 satellite system is not limited, and seamless coverage can be achieved in oceans, mountainous areas, grasslands, forests, Gobi, and deserts. Various mobile users such as vehicles, planes, ships, and individuals can use it, and the biggest advantage lies in the miniaturization and portability of the terminal. According to incomplete statistics, the end users of China's mobile communication satellite system have exceeded 3 million. The "divine power of Tiantong 1" originates from significant breakthroughs in multiple key technologies. Among them, low passive intermodulation (PIM) technology is one of the most critical technologies in the entire satellite system, and it is also a technical challenge of common concern in the international aerospace industry. When the antenna is launched at high power, due to its high receiving sensitivity, the emitted clutter will fall into the receiving channel and form interference, seriously affecting communication capabilities. The project team completed the first international full star wireless PIM test, meeting the requirements of satellite missions, marking that China's technology is at the international leading level. At present, the Fifth Academy of Aerospace Science and Technology Group is carrying out the Tiantong satellite system in orbit
Edit：Hou Wenzhe Responsible editor：WeiZe
Source：Beijing Daily
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