Finite-Time Disturbance Observer Design and Attitude Tracking Control of a Rigid Spacecraft

[+] Author and Article Information
Qixun Lan

School of Automation Southeast University Nanjing, Jiangsu, 210096, ChinaSchool of Mathematics & Physics Henan University of Urban Construction Pingdingshan, Henan,467036, China

Chunjiang Qian

Department of Electrical & Computer Engineering The University of Texas at San Antonio San Antonio, TX 78249 USA

Shihua Li

School of Automation Southeast University Nanjing, Jiangsu, 210096, China

1Corresponding author.

ASME doi:10.1115/1.4035457 History: Received December 06, 2015; Revised December 07, 2016


This paper considers the problem of finite-time disturbance observer (FTDO) design and the problem of FTDO-based finite-time control (FTC) for systems subject to nonvanishing disturbances. First of all, based on the homogeneous domination approach and saturation technique, a continuous FTDO is proposed. Then, by using the proposed FTDO design method, an FTDO is constructed to estimate the disturbances that exist in a rigid spacecraft system. Furthermore, a composite controller consisting of a baseline FTC law and a feedforward compensation term based on the estimation of FTDO is constructed for the rigid spacecraft system. It is shown that under the proposed composite controller the rigid spacecraft can track the desired attitude trajectory in a finite time. Simulation results are included to demonstrate the effectiveness of the proposed control approach.

Copyright (c) 2016 by ASME
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