Transactions of Nanjing University of Aeronautics & Astronautics
Prescribed-Time Attitude Control of Combined Spacecraft Based on Disturbance Observer
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Abstract:
In on-orbit servicing missions， the servicing spacecraft typically docks with the target spacecraft to form a combined spacecraft to carry out subsequent tasks， and the cooperative attitude control between the two spacecraft is one of the challenging techniques. To address the issues of inertia uncertainty， communication delays， and external disturbances in combined spacecraft attitude control， a prescribed-time attitude cooperative control method based on disturbance observer is proposed. Firstly， a distributed control model for combined spacecraft is established， and a prescribed performance function with directly adjustable convergence time is designed to characterize both the transient and steady-state behaviors of the system. Secondly， integrating the backstepping method， an attitude controller based on prescribed-time performance is developed to achieve fast and accurate attitude maneuvering of the combined spacecraft. Thirdly， a disturbance observer is introduced to estimate the composite disturbance caused by inertia uncertainty and external perturbations. Meanwhile， based on consensus theory， an attitude cooperative controller is designed to compensate for the control torque mismatch caused by communication delays. The system’s stability is then proved using Lyapunov method. Finally， numerical simulations demonstrate that the proposed controller achieves accurate cooperative attitude control of combined spacecraft within the prescribed time under the above disturbances.
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This work was supported by the National Natural Science Foundation of China （No. 12572054）.
Clc Number:
TN925
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