Designing a Fixed time Observer for Flexible Satellite Attitude Control System

Articles in Press

Document Type : Research Paper

Authors

1 Master of Science, Aerospace Engineering, Iran University of Science and Technology, Tehran

2 Faculty Member/ Department of Electrical Engineering- Iran University of Science and Technology

3 Electrical Engineering Department, Iran University of Science and Technology, Tehran, Iran.

Abstract

In this paper, the attitude stabilization problem of a flexible satellite that is affected by unknown disturbances, inherit uncertainties and vibrations of the flexible modes of solar panels is investigated. Since the flexible modes of the satellite and the external disturbances cannot be measured directly in most of cases, a fixed time observer is designed to estimate them and its convergence is guaranteed. In the following, an adaptive robust controller is designed for the attitude control system of the flexible satellite. In this work, the sliding mode control is used due to its high inherent robustness, and then to increase the robustness of the closed loop system against disturbances, the proposed controller is developed with an adaptive law. Moreover, the stability of the closed-loop system is guaranteed by using the Lyapunov theory. Finally, results of the numerical simulations confirm the satisfactory performance of the proposed attitude control system for flexible satellites.

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Aerospace Knowledge and Technology Journal

Articles in Press, Accepted Manuscript
Available Online from 20 February 2024

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