Prescribed Performance Attitude-Tracking Control for Rigid Satellite Under External Disturbance

Area of Science:

• Aerospace Engineering
• Control Systems Theory
• Robotics

Background:

• Satellite attitude control is critical for mission success.
• External disturbances pose significant challenges to maintaining accurate satellite orientation.
• Existing control methods may struggle with rapid disturbance rejection and guaranteed performance bounds.

Purpose of the Study:

• To develop an anti-disturbance prescribed performance control (PPC) scheme for rigid satellite attitude control.
• To ensure accurate attitude tracking under external disturbances within a prescribed time.
• To enhance the robustness and performance of satellite attitude control systems.

Main Methods:

• Development of a prescribed-time disturbance observer (PTDO) for rapid and precise disturbance estimation.
• Introduction of an appointed-time performance function (ATPF) to establish asymmetric performance boundaries.
• Application of Lyapunov stability theory to guarantee system stability and error boundedness.

Main Results:

• The proposed PTDO accurately estimates external disturbances within a prescribed time.
• The PPC scheme ensures that the satellite attitude system achieves desired tracking performance with guaranteed convergence time.
• The control strategy demonstrates uniform ultimate boundedness of disturbance estimation error and system errors.

Conclusions:

• The developed anti-disturbance PPC scheme effectively addresses the satellite attitude control problem under external disturbances.
• The integration of PTDO and ATPF provides a robust solution for achieving precise and time-bound attitude tracking.
• Numerical simulations validate the superior performance and effectiveness of the proposed control strategy.