Liu Ling, male, was born in August 2006 1936. 1In July, 959, Nanjing University stayed as a teacher after graduating from the Department of Mathematics and Astronomy. At present, he is also a consultant to the professional Committee of Aircraft Measurement and Control of China Aerospace Society, the editorial board of Journal of Aircraft Measurement and Control, and the editorial board of Journal of China Aerospace; Member of the 92 1 Engineering Orbit Expert Group of the General Armament Department, member of the Academic Committee of the Joint Research Center for Deep Space Exploration of the Ministry of Education and member of the Science and Technology Committee of the Joint Research Center for Satellite Navigation of the Ministry of Education; Orbital mechanics consultant of Xi Satellite Measurement and Control Center of General Armament Department, external expert of National Astronomical Observatory of Chinese Academy of Sciences, member of China Space Research Committee, etc.