China News Agency, Beijing, February 27th (Ma Shuaisha, He Jialing, Yu Zeyou) At 7:44 on February 27th, China successfully launched the Land Exploration No. 1 using the Long March 4 Bingyao 30 carrier rocket at the Jiuquan Satellite Launch Center. 01 group B star (also known as: L-band differential interferometric synthetic aperture radar satellite B star).

At 7:44 on February 27, Beijing time, China successfully launched the L-SAR 01 group B satellite into the sky with the Long March 4C carrier rocket at the Jiuquan Satellite Launch Center.

Photo by Wang Jiangbo

  The Land Exploration-1 01 satellite is the first scientific research satellite project approved in the "National Civil Space Infrastructure Medium and Long-term Development Plan (2015-2025)", consisting of A and B satellites.

A satellite has been successfully launched at the Jiuquan Satellite Launch Center on January 26, and the on-orbit test is currently being carried out as planned, and the satellite-related functions are performing normally.

After Star B enters orbit, it will conduct on-orbit tests alone, and then conduct formation tests with Star A.

  The technical status of the A and B double stars in the 01 groups of Land Exploration-1 is basically the same. Both are equipped with L-band synthetic aperture radar (SAR) loads. The interferometric altimetry and differential deformation measurement technologies are applied in orbit, which can realize heavy orbit interference deformation measurement and double star formation interference. With functions such as altimetry and single-star imaging, it can complete major observation tasks such as surface deformation measurement and digital elevation model acquisition. It has the characteristics of all-weather, all-day, multi-mode, and multi-polarization. , basic geographic information acquisition, forestry and other application needs, can form a rapid response capability to major disasters.

  Like the A star, the total area of ​​the SAR antenna of the 01 group B star of Land Exploration-1 exceeds 33 square meters, which is one of the SAR satellites with the largest in-orbit diameter in China.

The launch of the 01 group of Land Exploration-1 successfully realized the development of China's L-band interferometric SAR satellite "from nothing", and will realize the autonomous control of China's differential interferometric SAR data.

At 7:44 on January 26, 2022, Beijing time, China successfully launched the L-SAR 01 group A satellite with the Long March 4C carrier rocket at the Jiuquan Satellite Launch Center.

The satellite successfully entered the predetermined orbit, and the launch mission was a complete success.

The satellite is mainly used for effective monitoring of geological environment, landslides and earthquake disasters.

Photo by Wang Jiangbo

  Compared with similar international satellites, the Land Exploration-1 01 group of satellites have significantly improved in formation system design, SAR system sensitivity, and strict return-to-orbit control. ”, alleviate the dependence of industrial applications on foreign SAR data, and provide strong support for the “Belt and Road” initiative and the realization of sustainable development goals.

  In addition, the two satellites A and B of the 01 group of Land Exploration No. 1 use three-junction gallium arsenide solar cells with long life, high reliability and average photoelectric conversion efficiency greater than 30%, and use domestic germanium substrates for the first time.

The current on-orbit data of A star shows that the solar cell not only has electrical properties as good as imported solar cells, but also has better mechanical properties, which can meet the mission requirements for long life in orbit.

  This launch is the 87th launch of the Long March 4 series of launch vehicles and the 408th launch of the Long March series of launch vehicles.

The Star Arrows are all developed by the Eighth Academy of China Aerospace Science and Technology Corporation.

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