Disturbance Observer-based Pointing Control of Leighton Chajnantor Telescope

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Weirui Chen, Zheng Wang
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引用次数: 0

Abstract

Abstract Leighton Chajnantor Telescope (LCT), i.e., the former Caltech Submillimeter Observatory (CSO) 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 disturbance 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 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 (CSP) 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.
基于扰动观测器的Leighton chajantor望远镜指向控制
Leighton Chajnantor望远镜(LCT),即前加州理工学院亚毫米天文台(CSO)望远镜,将于2023年在智利Chajnantor高原新址进行翻新。LCT搬迁后的环境将发生明显变化,望远镜在观测过程中由于外壳完全打开,将直接暴露在较大的风扰动中。由于现有的控制方法不能很好地抑制风扰动,因此风扰动对LCT的指向控制是一个挑战。因此,有必要开发一种新的具有良好抗干扰能力的指向控制方法。本文设计了一种基于扰动观测器的复合位置控制器(DOB-CPC),该控制器采用H∞反馈控制器对扰动进行压缩,并采用前馈线性二次型调节器根据估计的扰动信号对扰动进行精确补偿。采用控制器切换策略(CSP),将比例控制器应用于瞬态过程以实现快速响应,将DOB-CPC应用于稳态以实现较小的位置误差。数值实验验证了所提出的指向控制器(即DOB-CPC)在抑制作用于LCT上的干扰方面的良好性能。
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来源期刊
Research in Astronomy and Astrophysics
Research in Astronomy and Astrophysics 地学天文-天文与天体物理
CiteScore
3.20
自引率
16.70%
发文量
2599
审稿时长
6.0 months
期刊介绍: Research in Astronomy and Astrophysics (RAA) is an international journal publishing original research papers and reviews across all branches of astronomy and astrophysics, with a particular interest in the following topics: -large-scale structure of universe formation and evolution of galaxies- high-energy and cataclysmic processes in astrophysics- formation and evolution of stars- astrogeodynamics- solar magnetic activity and heliogeospace environments- dynamics of celestial bodies in the solar system and artificial bodies- space observation and exploration- new astronomical techniques and methods
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