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Updated: Jan 29, 2026

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Observer-based prescribed performance attitude control for flexible spacecraft with actuator saturation.

Chao Zhang1, Guangfu Ma1, Yanchao Sun2

  • 1Department of Control Science and Engineering, Harbin Institute of Technology, 150001 Harbin, People's Republic of China.

ISA Transactions
|February 5, 2019
PubMed
Summary

This study presents a novel attitude control method for flexible spacecraft, ensuring fast and precise responses despite disturbances and actuator limits. The approach guarantees bounded errors and predictable convergence times for enhanced spacecraft maneuverability.

Keywords:
Attitude controlDisturbance observerFlexible spacecraftPrescribed performance controlSaturation compensation

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Area of Science:

  • Aerospace Engineering
  • Control Systems Theory
  • Robotics

Background:

  • Flexible spacecraft attitude control is challenging due to external disturbances and actuator limitations.
  • Existing methods often lack explicit convergence time guarantees or struggle with saturation effects.

Purpose of the Study:

  • To develop a prescribed performance attitude control strategy for flexible spacecraft.
  • To ensure bounded attitude errors, fast convergence, and robustness against disturbances and actuator saturation.

Main Methods:

  • A novel performance function with a prespecified terminal time was introduced.
  • Error transformation converted the control problem into a bounded error system.
  • Modal and disturbance observers were designed for vibration and disturbance compensation.
  • An auxiliary system was employed to handle actuator saturation.

Main Results:

  • The proposed control strategy ensures expected dynamic and steady-state responses.
  • Explicit prespecified terminal time guarantees maximum convergence time.
  • The control system effectively compensates for flexible vibrations, external disturbances, and actuator saturation.
  • Lyapunov theory confirmed the closed-loop system stability.

Conclusions:

  • The developed prescribed performance control method is effective for flexible spacecraft.
  • The strategy ensures robust attitude control with guaranteed performance and convergence times.
  • Simulation results validate the proposed approach's performance and effectiveness.