Sliding-mode control for staring-mode spacecraft using a disturbance observer

Abstract

This article studies the attitude control problem for spacecraft staring-mode observation. The staring mode of spacecraft is initially presented, and its advantages for observation are analysed. Then, based on the dynamic equation and kinematic equation using error quaternion and angular velocity error, a sliding-mode controller is designed to improve control effect, which prolongs observation time and enhances observation precision. Afterwards, a disturbance observer is devised and included in this proposed controller to reduce inherent chattering of sliding-mode control and to improve the stability of the spacecraft platform. Besides, the convergence of the proposed disturbance observer is proved theoretically. Finally, simulations are performed, and the results demonstrate that the proposed controller has quicker response, better robustness to uncertainty of spacecraft inertia parameters and external disturbance, and effectively weakens the chattering.

A Novel Disturbance Observer for Multiagent Tracking Control with Matched and Unmatched Uncertainties

“…It means the tracking trajectory could have the property of chattering reduction as well as excellent dynamic and static performance. The readers can also refer to [32][33][34] for the same argument.…”

Robust Finite-Time Control for Spacecraft with Coupled Translation and Attitude Dynamics

“…If there exist larger uncertainties and perturbations, should be then increased to guarantee the stability of the closed-loop system, which will enlarge the chattering. To alleviate the chattering problem and deal with the coupled dynamics, the observer approach is widely investigated [16][17][18]. Linear observers are designed for hybrid systems which contain coupling dynamics in [16].…”

Disturbance observer based finite-time attitude control for rigid spacecraft under input saturation

“…In Ref. [32], a DO was proposed to reduce inherent chattering of SMC and improve the stability and robustness of the spacecraft platform. Also, the advantages of the sliding mode based DO (SMDO) are, handling the disturbances and uncertainties in a robust way simply with fast response, alleviating the chattering problem and retaining its nominal control performance.…”