It was learned from Pengcheng Laboratory that my countryThe first satellite based on geostationary orbit(about 36,000 kilometers from the ground)The Q/V frequency band satellite-to-ground communication test system was successfully operated in Pengcheng Laboratory, The system is based on the satellite-to-ground communication test system of ESA and the German Aerospace Center based on the AlphaSat (Alpha Satellite) Q/V frequency band load, which fills the gap in the construction and research of my country’s Q/V frequency band high-orbit satellite-to-ground communication test system.

With the continuous increase of the number of satellites in orbit, the satellite orbits are becoming more and more crowded, and all countries regard space frequency resources as strategic resources for reserve and preemption. At present, the frequency band used by traditional satellite-to-ground communication is approaching saturation, and satellite communication is looking for new available frequency bands. Due to its large bandwidth and high capacity, the Q/V frequency band will become a hot frequency band for future development, and it will also be the competition for international communication satellites in the next 10 years. Focus. However, satellite-to-ground communication in the Q/V frequency band is easily affected by the propagation environment such as rain attenuation (referring to the attenuation caused by radio waves entering the rain layer), and its radio transmission characteristics are the basic problems faced by satellite communication in the millimeter wave frequency band. The research method is to carry out long-term actual tests on the planet.

According to reports, the Q/V frequency band satellite-to-ground communication test system built by Pengcheng Laboratory consists of the Q/V frequency band payload of the Shijian 20 satellite, the Q/V frequency band ground station, the automatic weather station and the automatic data acquisition and storage system. It supports the actual measurement of Q/V frequency band satellite-to-earth channel in different meteorological environments and the validation of the effectiveness of anti-fading technology.

The reporter was informed that based on the above-mentioned satellite-to-earth communication test system, the research team has completed the data collection and measurement of Q/V frequency band satellite-to-earth channel propagation characteristics for the first time in China, and has accumulated more than 1,400 hours of Q/V frequency band satellite-to-earth channel data. Based on the measured data, the research team proposed an ITU rainfall attenuation correction model, which can more accurately predict the rainfall attenuation in the Q/V frequency band. At present, the research team is carrying out the mapping of rainfall attenuation contours in the Q/V frequency band in China, so as to provide a basis for the site selection and resource allocation of ground stations in the Q/V frequency band.

The establishment of the Q/V frequency band satellite-ground communication test system and the development of related experiments and research work will help my country to occupy the priority use rights of this frequency band in the world as soon as possible; It provides a real and effective scientific basis for the design work such as geographical indicators, communication system and location selection of gateway stations, and lays a solid foundation for the construction of space infrastructure represented by ultra-large-capacity broadband communication satellites.

Editor: Huang Fei

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