Reduced-Order Fixed-Time Control for Under-actuated Spacecraft Hovering
作者单位：College of Aerospace Science and Engineering National University of Defense Technology
会议名称：《第40届中国控制会议》
会议日期：2021年
学科分类：08[工学] 081105[工学-导航、制导与控制] 0802[工学-机械工程] 0811[工学-控制科学与工程] 080201[工学-机械制造及其自动化]
关 键 词：Under-actuated Spacecraft Hovering Fixed-Time Control Reduced-Order Control
摘 要：This paper proposes a Reduced-Order Fixed-Time Control（ROFTC） method for the hovering problem of the under-actuated spacecraft. Firstly, the dynamic equation of the under-actuated relative motion is established for the hovering mission of the under-actuated spacecraft, and the controllability of the system and the feasible set of hovering are analyzed. Then,under-actuated relative motion model is deduced by dimensionality reduction. Based on the reduced-order dynamics model, a fixed-time controller is proposed. The simulation results show that the under-actuated spacecraft can achieve hovering motion to the given position under the reduced-order fixed-time controller, and the system state can converge in a fixed time with high accuracy.