title: Autonomous Pointing Control of a Large Satellite Antenna Subject to Parametric Uncertainty.
abstract: With the development of satellite mobile communications, large antennas are now widely used. The precise pointing of the antenna's optical axis is essential for many space missions. This paper addresses the challenging problem of high-precision autonomous pointing control of a large satellite antenna. The pointing dynamics are firstly proposed. The proportional-derivative feedback and structural filter to perform pointing maneuvers and suppress antenna vibrations are then presented. An adaptive controller to estimate actual system frequencies in the presence of modal parameters uncertainty is proposed. In order to reduce periodic errors, the modified controllers, which include the proposed adaptive controller and an active disturbance rejection filter, are then developed. The system stability and robustness are analyzed and discussed in the frequency domain. Numerical results are finally provided, and the results have demonstrated that the proposed controllers have good autonomy and robustness.
authors.affiliation: School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China. wushunan@dlut.edu.cn.
authors.forename: Shunan
authors.initials: S
authors.lastname: Wu
authors.affiliation: Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, China. liuyufei@qxslab.cn.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK. gianmarco.radice@glasgow.ac.uk.
authors.forename: Gianmarco
authors.initials: G
authors.lastname: Radice
authors.affiliation: School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China. tansj@dlut.edu.cn.
authors.forename: Shujun
authors.initials: S
authors.lastname: Tan
keywords: adaptive; antenna pointing; attitude control; autonomous control; satellite