Adaptive prediction backstepping attitude control for liquid-filled micro-satellite with flexible appendages

Abstract

In order to study the influence of lightweight flexible appendages vibration (LFAV) and liquid fuel sloshing (LFS) on the micro- and nano-satellite, based on ZDPS-2 satellite of Zhejiang University, this paper develops a kind of attitude dynamics which considers flexible appendages vibration and liquid sloshing. An adaptive prediction backstepping controller (APBC) is designed under the consideration of estimation error of the moment of inertia, the flexible vibration, liquid fuel sloshing and disturbance torques. Also time delay problem is considered in this algorithm. The finite time convergence is performed using Lyapunov stability method. Numerical simulations are carried out to verify the validity of the proposed controller. The results show that compared with the traditional PD controller, under the same attitude measurement error, the APBC has good control performance on eliminating the effect of time delay and provides estimations of moment of inertia parameters online. It can also significantly decrease the magnitude of the flexible appendages vibration and liquid sloshing.