Robust Saturated Finite-time Output Feedback Attitude Stabilization for Rigid Spacecraft

QL Hu, B Jiang (Harbin Institute of Technology, China) & MI Friswell (Swansea University)

Journal of Guidance, Control, and Dynamics, Vol. 37, No. 6, November 2014, pp. 1914-1929

Abstract

This paper investigates the velocity-free feedback control problem associated with finite-time attitude stabilization of a rigid spacecraft subject to external disturbance and input saturation. First of all, to address the lack of angular velocity measurement, a novel fast finite-time convergent observer is proposed to recover the unknown angular velocity information in a finite time under external disturbance. Then, a finite-time output feedback controller is proposed using the designed finite-time observer, in which the control input saturation nonlinearity is explicitly considered in the proposed finite-time stabilizer. Rigorous proofs show that the proposed observer can achieve finite-time stability, the controller rigorously enforces actuator-magnitude constraints and the attitude of the rigid spacecraft will converge to the equilibrium in a finite time. Numerical simulations illustrate the spacecraft performance obtained using the proposed controllers.

Paper Availability

This material has been published in the Journal of Guidance, Control, and Dynamics, Vol. 37, No. 6, November 2014, pp. 1914-1929. Unfortunately the copyright agreement with AIAA does not allow for the PDF file of the paper to be available on this website. However the paper is available from AIAA - see the link below.


Link to paper using doi: 10.2514/1.G000153

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