Aerospace Knowledge and Technology Journal

Aerospace Knowledge and Technology Journal

Designing a fixed time observer for attitude control system of flexible satellites

Document Type : Research Paper

Authors
Erfan Rezaei 1
Hossein bolandi 2
Mohammad Fathi 3
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.
Keywords
Flexible satellite
fixed time observer
attitude control
adaptive robust controller
Subjects
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