[News from the News Center] Several days ago, China Academy of Space Technology (CAST) - Xi’an Institute of Space Radio Technology sent a letter of thanks to YSU expressing gratitude to Prof. Zhao Yongsheng and his team for their outstanding contribution of the launching program of the first BDS-3 GEO satellite.
At 23:57, November 1, 2018, the 41st BDS satellite (the first BDS-3 GEO satellite) was successfully launched onboard a Long March 3B rocket at Xichang Satellite Launch Center. On the morning of November 8, the two satellite antennas were successfully deployed, and the payload was opened. The structure of deployable satellite antenna is developed by CAST - Xi’an Institute of Space Radio Technology, andYSU Prof. Zhao Yongsheng as well as his team is involved in its research and development.
The 41st BDS satellite was successfully launched. (Photo from People.cn)
The BeiDou Navigation Satellite System (BDS), independently constructed and operated by China, is considered as the fourth global navigation satellite system afterthe United States’ Global Positioning System (GPS), Russia’s Global Navigation Satellite System(GLONASS) the European Union’s Galileo Satellite Navigation System.
China has completed the construction of BDS-1 and provided services to the whole country by the end of 2000, and completed the construction of BDS-2 and provided services to the Asia-Pacific region by the end of 2012. BDS-3to be completed is designed to provide services worldwide. The 41st BDS satellite is the first BDS-3 satellite in high orbit, about 36,000 km above the Earth. It is called “BDS-3 GEO satellite” because it operates on a geostationary orbit.
The satellite-borne deployable antenna is one of the key payloads of the satellite, which is of significance in communication and data transmission between the satellites in orbit and the ground base station. Whether it can be successfully deployed is a key factor determining the success or failure of the satellite. The antenna adopted in this satellite is a multi-closed-loop coupling mechanism. It is the most complex type of space mechanism. The innovative design, mechanism analysis and optimization of the structure are more complexthan those of the traditional parallel mechanism. Prof. Zhao Yongsheng and his team have been working with the Institute of Space Radio Technology since 2014, and they have accumulated profound academic strength in mechanism. Together with the research group of the Institute of Space Radio Technology, Professor Yao Jiantao and Associate Professor Xu Yundoufrom this team led their research groupto make breakthrough in the configuration synthesis, deployment kinematics, and deployment dynamics of the satellite-borne deployable antenna, and they innovatively established a theoretical system of the configuration synthesis and mechanism analysis, laying theoretical and technological foundation for further research and development of higher-level satellite-borne deployable antennas.In the cooperative researchof the kinematics analysis and mechanism algorithm, Professor Zhao and his team have always kept a high sense of responsibility and a strong sense of professionalism, and they completed a series of key technical researchwith perseverance and hard work, making outstanding contributionsto the successful developmentof this type of antenna.
Prof. Zhao gives a key-note speech at the 3rd deployable space structure academic conference. (Photo from School of Mechanical Engineering)
Before the research of the deployable antenna of the BDS-3 GEO satellite, Prof. Zhao and his teamhave conducted cooperation with the 54th Research Institute of China Electronics Technology Group Corporation (CETC54) in the accurate adjustment system for sub-reflectorpose of Shanghai 65m radio telescope (Tianma Telescope) and in the Five-hundred-meter Aperture Spherical Telescope (FAST), and have cooperation with CETC14in AirborneActive Phased ArrayWide-angle Domain Fire-control Rader. The deployable antenna is another breakthrough in the aerospace industry of Prof. Zhao Yongsheng and his team, markingthe successful application of their space multi-closed-loop special robots in aerospace deployable antennas.
[Translated by Xing Tong]