Disturbance Observer-based Pointing Control of Leighton Chajnantor Telescope

作     者：Weirui Chen Zheng Wang Weirui Chen;Zheng Wang

作者机构：School of AutomationSoutheast UniversityNanjing 210096China Key Laboratory of Measurement and Control of Complex Systems of EngineeringMinistry of EducationSoutheast UniversityNanjing 210096China 

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1期

页      面：135-150页

核心收录：

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 0704[理学-天文学] 10[医学] 

基　　金：Universidad de Concepción, UdeC Southeast University, SEU 

主　　题：instrumentation:miscellaneous methods:analytical methods:numerical telescopes 

摘      要：Leighton Chajnantor Telescope(LCT), i.e., the former Caltech Submillimeter Observatory telescope, will be refurbished at the new site in Chajnantor Plateau, Chile in 2023. The environment of LCT will change significantly after its relocation, and the telescope will be exposed to large wind disturbances directly because its enclosure will be completely open during observation. The wind disturbance is expected to be a challenge for LCT s pointing control since the existing control method cannot reject this disturbance very well. Therefore, it is very necessary to develop a new pointing control method with good capability of disturbance rejection. In this research, a disturbance observer—based composite position controller(DOB-CPC) is designed, in which an H∞feedback controller is employed to compress the disturbance, and a feedforward linear quadratic regulator is employed to compensate the disturbance precisely based on the estimated disturbance signal. Moreover, a controller switching policy is adopted, which applies the proportional controller to the transient process to achieve a quick response and applies the DOB-CPC to the steady state to achieve a small position error. Numerical experiments are conducted to verify the good performance of the proposed pointing controller(i.e., DOB-CPC) for rejecting the disturbance acting on LCT.