“Weather competition” struggle for more than 50 years of China fengyun satellite what “gold” skills?
Fengyun no. 3 E star development scene, data map China Aerospace Science and Technology Group eight institute for the map of The New Network in Shanghai on February 20, the topic: “weather competition” struggle for more than 50 years of China’s Fengyun satellite what “pick gold” skills?During the Beijing Winter Olympics, a number of Chinese Fengyun satellites “gazed” at the earth from space, monitoring the surface temperature and changes in the clouds, and helping to provide meteorological support.In the “arena” of space, China’s “Fengyunsatellite family”, who have been fighting for more than 50 years, is not without stories.These years, whether in polar orbit or geostationary orbit, the “Fengyun satellite family” has broken new ground.China’s Fengyun Satellite family, the first country in the world to cover the third orbit, is a gold medal winner because of its “wide coverage”.In 2021, China launched the world’s first civilian daybreak orbit meteorological satellite, Fengyun-3 E (Li Mingxing). Together with the previously launched Fengyun-3 C and D satellites, China has become the first country in the world to realize the three-star network of daybreak orbit, morning orbit and afternoon orbit.Similar to the US and Europe, China’s previous satellite observation time was concentrated around 10 am and 2 PM. Within the time window of observation assimilation every 6 hours, there were always 2 to 3 satellites in the global orbit in the blank area, which could not provide initial observations with global coverage.The launch of Fengyun-3 E satellite makes up for the deficiency of satellite observation orbit and observation data.China aerospace science and technology group eight, director of the general hospital of the 3rd satellite designer xiao-fei Chen told the news agency correspondent in an interview with introduction, compared with the west no. 4 “staring at the earth, 1 minute a picture”, a satellite of the 3rd 12 hours to a global “sweep”, that is, if it over at 10 in the morning in China,It will not be able to reappear over China until 10 p.m.Now, with a dawn orbit at 5:30 a.m., a morning orbit at 10 a.m., and an afternoon orbit at 2 p.m., Fengyun-3 can “sweep” the globe every four hours, making the data much more timely.China aerospace science and technology corporation, which is eight yuan 4 satellite product assurance manager, a department of meteorological satellite ZongTiBu overall environment xiao-jie Chen said, “the star” Lebanon after launch, China’s orbit earth observation orbit from a global perspective is one of the most abundant, Europe and the United States combined with morning and afternoon orbit, civilian satellites, China is the only one orbit at dawn, “so,Meteorological researchers in Europe and the United States, as well as other countries around the world, are looking forward to some observations of Li Mingxing.”The observation capacity of fengyun satellite has been greatly improved over the past decade, Chen said.From FY-2 to FY-4, China’s meteorological satellites have made a great leap forward in the field of geostationary meteorological satellites, which do not move relative to the Earth.”The original Fy-2, we called it ‘spin-stable’ because it was spinning all the time;Now Fengyun4, we call it ‘triaxial stability’ because it has a relatively stable attitude toward the Earth.”Chen Xiaojie said.In fact, for a geostationary weather satellite, the leap is very large, he says.China, the United States and Europe started to develop the latest generation of “three-axis stable” geostationary orbit meteorological satellites in the same way, probably from the 1990s, but so far only China and the United States have successfully developed independently.Why is “triaxial stability” important?Chen xiaojie explained, you can imagine that if the earth is in front of the satellite and the satellite wants to observe it, if the satellite is in the spin state, the observation time is very short, only about 4 to 5 percent of the effective time.Triaxial stability, which is the equivalent of a satellite staring straight at the Earth, improves efficiency more than 20 times.”It’s very important to have ‘staring’ in geostationary orbit. For example, if we were fixed over Beijing, the observation efficiency would not be fully utilized otherwise.Now when the ‘triaxial stability’ is stationary, the satellite will be able to pick up the dynamic changes of weather conditions in the Beijing area by staring directly at it.”At present, a number of Chinese Fengyun meteorological satellites have been included into the global operational and applied meteorological satellite sequence by the World Meteorological Organization (WMO), becoming important members of the Global Integrated Earth Observation System and duty satellites of the International Charter on Disasters mechanism, helping to facilitate global meteorological disaster observation and forecast.In January, for example, a volcano erupted on the South Pacific island of Tonga, observed by several orbiting fy-3 and FY-4 satellites.(after)