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Share the QR code with wechat scanning code < / P > < p > to friends and circles of friends < / P > < p > People's daily client Feng Huazhang Wei < / P > < p > at 7:44 on January 26, China successfully launched landsat-1 01 group a satellite (L-band differential interference synthetic aperture radar satellite a satellite) by using the long march 4C carrier rocket at Jiuquan Satellite Launch Center. The satellite has the characteristics of all-weather, all-time, multi-mode and multi polarization. It can meet the acquisition needs of basic geographic information such as land and resources, earthquake, disaster prevention and mitigation, surveying and mapping and forestry, accelerate the formation of rapid response capacity for major disasters, and provide space observation technical support for the realization of global goals such as sustainable development < p > landsat-1 group 01 satellites are scientific research satellites in the medium and long term development plan of national civil space infrastructure (2015-2025). They are composed of satellites A and B and operate in quasi solar synchronous orbit at an altitude of about 600 kilometers. Both satellites are equipped with L-band synthetic aperture radar (SAR) payload, with a variety of imaging modes, with a maximum resolution of 3M and a maximum observation width of 400km. It will make full use of the long wave length of L-band radar and its penetration ability in vegetation area, which can provide long wave synthetic aperture radar data with wide coverage, high density of measurement points and high repetition frequency for solving the early identification of potential hazards in areas with complex conditions and difficult to reach by ground investigation < p > dual satellites can carry out two flight modes: follow-up flight and around flight. It runs on the same regression orbital plane in the follow-up mode, with a phase interval of 180 degrees, and has the ability of repeated orbit observation of single satellite for 8 days and double satellite for 4 days. Using the differential interferometric synthetic aperture radar deformation measurement technology, it obtains multiple images before and after the change of land subsidence, carries out data processing, extracts deformation information, and effectively supports land subsidence, landslide, land collapse Seismic deformation and other application requirements. Flying around formation mode can realize interferometric synthetic aperture radar high-precision ground elevation measurement through high-precision phase, time and space synchronization between satellites. The satellite project will promote the independent control of such data in China and significantly reduce the dependence of geological, earthquake, emergency and other industries on foreign data < p > the National Space Administration is responsible for the organization and management of the satellite project, the organization and coordination of major issues and the approval of launch license. The Ministry of natural resources is the main user unit, and the user departments such as the Ministry of emergency management and the Ministry of civil affairs are responsible for the construction and operation of the application system. The China Resources Satellite Application Center and the Aerospace Information Innovation Institute of the Chinese Academy of sciences are responsible for the construction and operation of the ground system, Shanghai Aerospace Technology Research Institute of Aerospace Science and technology group is responsible for the overall development of satellite system and carrier system, and China satellite launch measurement and control system department is responsible for the organization and implementation of launch site and measurement and control system. Landsat-1 group-01 B satellite is scheduled to be launched at the end of February < p > this is the 407th launch of the long march series of launch vehicles < p > photographer: Wang Jiangbo, video: Zhang Jie, Hao Yutong, Jiang Jiali

2023-03-22 10:04:49