China News Service, Beijing, September 27th. Title: Demystifying Environmental Disaster Mitigation No.2 A and B Stars: A picture is produced in 2 days and the camera width 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 launch of the satellite, disaster prevention and mitigation, and environmental protection will be the main business, and the needs of the land and resources, water conservancy, agriculture, forestry, earthquake and other industries will be taken into consideration.

At 11:23 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 satellites A and B with one arrow and two stars.

The Long March 4B carrier rocket took off.

Photo by Zhang Yongjiang

One picture 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.

The two satellites are in the same technical state and have a design life of 5 years. 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 ability of visible and infrared multi-spectral data, 1 map of the country in 2 days, and hyperspectral data, 1 map of the country in 15 days, which will greatly improve China's medium-resolution visible light and infrared And hyperspectral data acquisition capabilities to meet the urgent needs of the country for the continuous supply 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 widely used in disaster monitoring and assessment, post-disaster recovery and reconstruction, and environmental monitoring and inspection.

At 11:23 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 satellites A and B with one arrow and two stars.

The picture shows the Long March 4B carrier rocket igniting off.

Photo by Zhang Yongjiang

4 cameras capture "largely wide" images

  Environmental Disaster Mitigation-2 A and B satellites 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 has strong application adaptability.

  A single 16-meter camera has a width of more than 200 kilometers, and a single satellite with 4 cameras can achieve a width of more than 800 kilometers, which is equivalent to the distance from Beijing to Shenyang.

4 cameras take a single image, each camera captures a different image, and then after a simple stitching process, you can get an 800 km "largely wide" image.

  The wide practicality is well deserved.

Since June this year, southern China has ushered in continuous heavy rainfall, which has 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 “largely wide” 16-meter camera can capture the impact of a large-scale disaster and provide an important guarantee for timely and effective disaster prevention and mitigation work.

At 11:23 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 satellites A and B with one arrow and two stars.

The picture shows the simulated images of Environmental Disaster Reduction II A and B satellites.

Photo courtesy of China Academy of Space Technology issued by China News Service

Satellite uses CAST2000 platform

  The platform is the key to building a high-level satellite.

Environmental Disaster Reduction II A and B satellites use the CAST2000 platform, which has wide load adaptability, and can be configured with attitude control, wide-range side swing maneuverability, and flexible orbit maneuverability according to load requirements to meet high maneuverability. , High precision control, high stability, long life and high reliability requirements.

  So far, relying on the CAST2000 platform, Aerospace Dongfanghong, a subsidiary of China Academy of Space Technology, has successively developed and launched Gaofen-1, Environmental Disaster Mitigation-1C satellite, Venezuelan Remote Sensing Satellite-1, Ocean-1 C/D satellite, Sino-French Marine satellites and other models have made outstanding contributions to China's high-resolution observation, environmental disaster reduction, ocean color remote sensing, and international cooperation.

  It is understood that after 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 over the ground.

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