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China News Service, Beijing, September 27. Title: Demystifying Environmental Disaster Mitigation No.2 Stars A and B: An image is produced in 2 days. The width of the chamber is better than 800 kilometers
Author Guo Chaokai
On September 27, the Environmental Disaster Reduction II A and B satellites were successfully launched at the Taiyuan Satellite Launch Center. After the satellite launch, disaster prevention and mitigation and environmental protection will be the main business, and the needs of land and resources, water conservation, agriculture, forestry, earthquakes will be taken into account and other industries.
At 11:23 a.m. on September 27 Beijing time, China used the Long March 4B carrier rocket at the Taiyuan Satellite Launch Center to successfully launch the Environmental Disaster Mitigation 2 A and B satellites with an arrow and two stars. . The Long March 4B carrier rocket took off.Photo by Zhang Yongjiang
A photo in 2 days
The Environmental Disaster Mitigation II satellites A and B were developed by the China Academy of Space Technology under the China Aerospace Science and Technology Corporation. Both satellites are in the same technical condition and have a 5-year design life. Each satellite is equipped with 4 types of optical payloads: 16-meter cameras, hyperspectral imagers, infrared cameras, and atmospheric correction devices .
The two satellites can quickly obtain ground images through the same orbital network and have the capability of visible and infrared multispectral data, 1 country map in 2 days and hyperspectral data, 1 country map in 15 days, which will greatly improve Measure China’s medium resolution visible and infrared light. And hyperspectral data acquisition capabilities to meet the country’s urgent needs for continuous provision of remote sensing data in related fields.
In the future, the Environmental Disaster Mitigation-2 A and B satellites will replace the Environmental Disaster Mitigation-1 A / B satellites that have been in orbit for 12 years. The image data will be used extensively in disaster monitoring and assessment, post-disaster recovery and reconstruction, and environmental monitoring and inspection.
At 11:23 a.m. on September 27 Beijing time, China used the Long March 4B carrier rocket at the Taiyuan Satellite Launch Center to successfully launch the Environmental Disaster Mitigation 2 A and B satellites with an arrow and two stars. . The image shows the Long March 4B carrier rocket firing up.Photo by Zhang Yongjiang
4 cameras capture “largely wide” images
Environmental Disaster Mitigation II satellites A and B each carry an optical payload developed by the China Academy of Space Technology 508. Each optical payload consists of four 16-meter multispectral cameras (16-meter cameras for short). The camera has the characteristics of small size, light weight, short development period and high system reliability, and it has great adaptability to applications.
A single 16-meter camera has a width of more than 200 kilometers, and a single satellite with 4 cameras can reach a width of more than 800 kilometers, which is equivalent to the distance from Beijing to Shenyang. A single image with 4 cameras, each camera captures a different image, after a simple stitching process, you can get a 800km “largely wide” image.
The wide practicality is well deserved. Since June this year, southern China has given way to continuous heavy rains, which have a wide range of influence. In the face of large-scale disasters such as floods, snow disasters, and droughts, quick access to the scope and loss of disasters is essential for disaster relief. A 16 meter “wide wide” camera can capture the impact of a wide range of disasters and provide an important assurance for timely and effective disaster prevention and mitigation work.
The satellite uses the CAST2000 platform
The platform is the key to building a high-level satellite. Environmental Disaster Mitigation II satellites A and B use the CAST2000 platform. This platform has wide load adaptability and can be configured with attitude control, wide-range attitude lateral maneuverability, and flexible orbit maneuverability according to load requirements to meet high mobility. , High precision control, high stability, long life and high reliability requirements.
So far, relying on the CAST2000 platform, Aerospace Dongfanghong, a subsidiary of the China Academy of Space Technology, has successively developed and launched Gaofen-1, the Environmental Disaster Mitigation-1C satellite, the Venezuelan Remote Sensing Satellite-1, the Haiyang-1 C / D satellite and the Chinese-French. Marine satellites and other models have made outstanding contributions to China’s high-resolution observation, environmental disaster reduction, remote ocean color sensing, and international cooperation.
It is understood that once the Environmental Disaster Reduction Satellites A and B enter orbit, they will cooperate with Gaofen-1 and Gaofen-6. This is the first time that environmental disaster reduction satellites have carried out integration and coordination between satellite projects. Constellation coordination will improve satellites Utilization rate, overall improvement of China’s remote sensing observation efficiency on the ground. (Finish)
