|Chattering Free Distributed Consensus Control for Attitude Tracking of Spacecraft Formation System with Unmeasurable Angular Velocity
Miao Xu, Yiming Fang*, Jianxiong Li, and Xiaodong Zhao
International Journal of Control, Automation, and Systems, vol. 18, no. 9, pp.2277-2288, 2020
Abstract : In this paper, the attitude tracking control of spacecraft formation is studied when the velocities of spacecrafts are unmeasurable. Firstly, a Finite-Time Extended State Observer (FTESO) is constructed to estimate the unmeasured angular velocity and compensate the external disturbance for each spacecraft. Secondly, a chattering free distributed consensus controller which did not require inversion of Laplacian matrix is proposed based on FTESO and Integral Nonsingular Terminal Sliding Mode (INTSM). It is proved that the proposed consensus controller can realize finite-time attitude tracking control of spacecraft by the Lyapunov stability theory. Finally, a simulation example with one leader and four followers is given. The simulation results show that the proposed consensus controller can eliminate system chattering, and provide fast finite-time convergence performance and high precision Tracking.
Attitude tracking, finite time extended state observer, spacecraft formation system, super-twisting algorithm.