Transactions of Nanjing University of Aeronautics & Astronautics
Predefined-Time Guaranteed Performance Attitude Tracking Control of Flexible Spacecraft Based on Multi-observers
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Abstract:
To overcome external environmental disturbances， inertial parameter uncertainties and vibration of flexible modes in the process of attitude tracking， a comprehensively effective predefined-time guaranteed performance controller based on multi-observers for flexible spacecraft is proposed. First， to prevent unwinding phenomenon in attitude description， the rotation matrix is used to represent the spacecraft’s attitude. Second， the flexible modes observer which can guarantee predefined-time convergence is designed， for the case where flexible vibrations are unmeasurable in practice. What’s more， the disturbance observer is applied to estimate and compensate the lumped disturbances to improve the robustness of attitude control. A predefined-time controller is proposed to satisfy the prescribed performance and stabilize the attitude tracking system via barrier Lyapunov function. Finally， through comparative numerical simulations， the proposed controller can achieve high-precision convergence compared with the existing finite-time attitude tracking controller. This paper provides certain references for the high-precision predefined-time prescribed performance attitude tracking of flexible spacecraft with multi-disturbance.
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This work was supported by the National Natural Science Foundation of China （No.12472045） and the Shanghai Aerospace Science and Technology Innovation Fund （No.SAST2022-036）.
Clc Number:
V412.4
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