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Fixed-time attitude coordination control for spacecraft with external disturbance.

Minglei Zhuang1, Liguo Tan2, Shenmin Song1

  • 1Center for Control Theory and Guidance Technology, Harbin Institute of Technology, Harbin, 150001, China.

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Summary

This study ensures spacecraft formation flying (SFF) achieves fixed-time stability using a novel nonsingular terminal sliding mode surface (NTSMS). Controllers guarantee rapid, predictable convergence even with unknown disturbances.

Keywords:
Adaptive controlAttitude synchronizationFixed-time stabilityRotation matrix.Sliding mode control

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Area of Science:

  • Aerospace Engineering
  • Control Theory
  • Robotics

Background:

  • Spacecraft formation flying (SFF) requires robust attitude coordination control.
  • External disturbances and unknown parameters pose significant challenges to stability.
  • Existing finite-time control methods may lack guaranteed convergence times.

Purpose of the Study:

  • To develop fixed-time attitude coordination control for SFF systems.
  • To ensure state convergence within a predetermined time bound.
  • To address control challenges posed by external disturbances and unknown parameters.

Main Methods:

  • Design of a novel nonsingular terminal sliding mode surface (NTSMS).
  • Development of an attitude synchronization controller based on NTSMS for undirected communication topologies.
  • Creation of a fixed-time adaptive control law for unknown disturbance boundaries.
  • Utilizing a revised NTSMS for guaranteed fixed-time stability.

Main Results:

  • The proposed NTSMS ensures fixed-time convergence for SFF attitude control.
  • The attitude synchronization controller guarantees fixed-time stability under undirected communication.
  • The adaptive control law ensures fixed-time stability even with unknown disturbance bounds.
  • Simulations demonstrate superior performance over existing finite-time controllers.

Conclusions:

  • The novel NTSMS and associated controllers achieve guaranteed fixed-time stability for SFF.
  • The adaptive control law effectively handles unknown external disturbances.
  • The proposed methods offer enhanced performance and predictable convergence for spacecraft formations.