Shulou(Shulou.com)11/24 Report--

Thanks CTOnews.com net friend aviation gentleman, grass Luo Yuzi clue delivery! CTOnews.com March 5 news, CPPCC National Committee member, China Aerospace Science and Industry Second Hospital (hereinafter referred to as the Second Hospital) President Song Xiaoming revealed that the Second Hospital is planning the construction of ultra-low orbit satellite constellation, is currently carrying out the development of the first star, is expected to have launch conditions in September 2023.

According to introduction, after the successful orbit of the first satellite, key technologies such as ultra-low orbit flight technology, high-resolution earth-to-earth imaging technology, space-borne intelligent processing and direct information to user terminals will be demonstrated and verified.

CTOnews.com Science: Ultra-low orbit usually refers to orbits at altitudes of 150 km to 300 km. Compared with traditional orbits, ultra-low orbit flight can improve payload efficiency, reduce satellite development and launch costs, and improve information acquisition and transmission efficiency. It is suitable for mass production and high-density launch of satellites.

For example, for visible light loads, the focal length and aperture of the camera to obtain the same resolution image are basically scaled down due to the relatively short distance from the earth's surface. Similarly, for microwave remote sensing payload, the power aperture product decreases greatly with the decrease of orbit altitude, which can effectively reduce the power and electrical aperture of synthetic aperture radar (SAR) antenna.

At present, the United States, Japan, Europe and other countries and regions have carried out ultra-low orbit satellite research respectively, and the United States has proposed the "Devil Fish" program for high-score observation; Japan also launched ultra-low orbit test satellite in 2017, obtaining high-score remote sensing images and ultra-low orbit atmospheric data; European Space Agency launched gravity field and steady-state ocean current detector in 2009, and obtained high-precision gravity field measurement data.

Ultra-low orbit satellites have obvious application advantages in optics, microwave, geophysical field, electric separation layer and so on. However, ultra-low orbit satellites have not been developed for a long time. The main reason is that with the orbit decreasing, the atmospheric density increases sharply, the orbit environment is more and more affected by the atmosphere, the atmospheric drag perturbation and high concentration atomic oxygen environment have prominent effects on satellites, and the stable operation of ultra-low orbit satellites is extremely difficult.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.