The Active Compensation Technique for Large Reflector Antennas Based on Quadratic Curve Fitting

作     者：Tian-Xiang Zheng Bin-Bin Xiang Han-Wei Cui Wei Wang Pei-Yuan Lian Shang-Ming Lin Yang Zhang Jian-Ping Zhou Kai Li Tian-Xiang Zheng;Bin-Bin Xiang;Han-Wei Cui;Wei Wang;Pei-Yuan Lian;Shang-Ming Lin;Yang Zhang;Jian-Ping Zhou;Kai Li

作者机构：School of Mechanical EngineeringXinjiang UniversityUrumqi 830017China School of Mechano-Electronic EngineeringXidian UniversityXi’an 710017China Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2024年第24卷第7期

页      面：226-234页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：funded by the National Natural Science Foundation of China(NSFC,grant Nos.12363011,52275270,and 52275269) Natural Science Foundation of Xinjiang Uygur Autonomous Region(No.2023D01C22) the Tianchi Talents Program of Xinjiang,the National Key Basic Research Program of China(No.2021YFC2203501) the Xinjiang Postdoctoral Foundation 

主　　题：Methods analytical-Methods numerical-Telescopes 

摘      要：Active reflectors are often used to compensate the surface distortion caused by environmental factors that degrade the electromagnetic performance of large high-frequency reflector *** is crucial for maintaining high gain operation in antennas.A distortion compensation method for the active reflector of a large dual-reflector antenna is proposed.A relationship is established between the surface deformation and the optical path difference for the primary reflector by geometric ***,employing finite element analysis,a polynomial fitting approach is used to describe the impact of adjusting points on the reflector surface based on the coordinates of each *** standardizing the positions of various panels on the reflector,the fitting ns can be applied to the reflector panels of similar ***,based on the distribution characteristics of the primary reflector panels,the adjustment equation for the actuators is derived by the influence matrix *** can be used to determine the adjustment amount of actuators to reduce the rms of the optical path ***,the least squares method is employed to resolve the matrix *** example of a 110 m aperture dual-reflector antenna is carried out by finite element analysis and the proposed *** results show that the optical path difference is reduced significantly at various elevation cases,which indicates that the proposed method is effective.