Disturbance observer-based fault-tolerant attitude tracking control for rigid spacecraft with finite-time convergence

Abstract

In this paper, finite-time fault-tolerant attitude tracking control is investigated for rigid spacecraft system with external disturbances, inertia uncertainties and actuator faults. A novel finite-time disturbance observer combined with a nonsingular terminal sliding mode controller is developed. Using an equivalent output error injection approach, a finite-time disturbance observer with simple structure is firstly designed to estimate lumped uncertainty. Then, to remove the requirement of prior knowledge about lumped uncertainty and reduce chattering, an adaptive finite-time disturbance observer is further proposed, and the estimations converge to the neighborhood of the true values. Based on the designed observer, a unified finite-time attitude controller is obtained automatically. Finally, both additive and multiplicative faults are considered for simulations and the results illustrate the great fault-tolerant capability of the proposed scheme.

Immersion and invariance sliding mode control with time-delay estimation for rigid spacecraft with uncertainties and actuator faults

“…However, these approaches only compromise on tracking accuracy and robustness, which may lead to over-conservatism. There are still some works that involve the online fault detection and diagnosis procedure (Shen et al, 2019; Zhang et al, 2018; Zong et al, 2019). They utilized the information reconstructed by fault detection and diagnosis procedure to re-configure controller to maintain the stability and acceptable performance.…”

The Attitude Control Algorithm of Agile Optical Satellite Oriented to Nonparallel-Ground-Track-Imaging

“…Considering for the convergence rate, controllers proposed in [21]- [25] possess finite-time stability. Especially, methods in [23] is capable of tackling the actuator fault and the input saturation constraint will not be violated in [24], [25].…”