Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Dynamic Modeling and Developing a Sliding Mode Controller Based on a Fixed-Time Disturbance Observer for Simultaneous Control of Distance and Attitude in Spacecraft Proximity Operations

Authors
Ahmad Hemmati 1
Mohammad-Reza Sayyed Noorani 2
Jalil Beyramzad 3
1 PhD Student, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
2 Associate Professor, Department of Mechatronics Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
3 PhD Student, Faculty of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
10.30506/ijmep.2025.2040441.1991
Abstract
This paper presents a sliding mode control scheme based on a fixed-time disturbance observer for satellite proximity operations in the presence of parameter uncertainties and external disturbances. The observer is designed to estimate aggregated uncertainties, including kinematic coupling, parameter uncertainties, and environmental disturbances. Based on the observer's output, a sliding mode control is developed to achieve fixed-time convergence, where the observer neutralizes the effect of uncertainties and reduces chattering. Furthermore, the proposed control method enhances convergence speed and improves tracking accuracy. The fixed-time stability of the proposed control system is proven using the Lyapunov method. Additionally, its effectiveness is verified through numerical simulations.
Keywords
Satellite proximity operations
Fixed-time convergence
Sliding mode control
Disturbance observer

Subjects

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  • Receive Date 06 September 2024
  • Revise Date 18 December 2024
  • Accept Date 08 March 2025