Premium
Finite‐time cooperative attitude control for leader‐follower spacecraft with fixed‐time observer
Author(s) -
Zhang Lijun,
Xia Yuanqing,
Cui Bing,
Zhang Jinhui,
Shen Ganghui
Publication year - 2020
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/rnc.5160
Subject(s) - control theory (sociology) , settling time , observer (physics) , convergence (economics) , angular velocity , actuator , state observer , computer science , upper and lower bounds , controller (irrigation) , spacecraft , control (management) , engineering , mathematics , control engineering , nonlinear system , physics , step response , quantum mechanics , artificial intelligence , aerospace engineering , biology , economics , economic growth , mathematical analysis , agronomy
Summary This article investigates the problem of distributed attitude tracking control for the leader‐follower spacecraft in the presence of the external disturbances, model uncertainties, and actuator faults. First, a novel fixed‐time observer is developed to estimate the angular velocity of the leader. In contrast to the existing finite‐time observer design methods, the settling time is independent of the initial conditions, and the upper bound of the angular acceleration of the leader is not required for each follower. To estimate and compensate the total uncertainties with finite‐time convergence, a fraction‐based adaptive scheme is designed. Based on the fixed‐time observer and the adaptive scheme, a continuous finite‐time distributed control law is developed such that the stability of the observer‐controller closed‐loop system is guaranteed. Numerical simulations are illustrated to demonstrate the performance of the control scheme.