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Nonsingular fixed-time attitude coordinated tracking control for multiple rigid spacecraft.

Ye Tian1, Changkun Du1, Pingli Lu1

  • 1School of Automation, Beijing Institute of Technology, Beijing 100081, PR China.

ISA Transactions
|March 6, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a new fixed-time attitude control method for multiple spacecraft, ensuring precise coordination even with unknown disturbances. The approach removes initial condition dependencies for robust and efficient spacecraft attitude tracking.

Keywords:
Attitude coordinated controlDistributed observerFixed-time controlNonsingular sliding modeSliding mode control(SMC)Spacecraft formation flying(SFF)

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Area of Science:

  • Aerospace Engineering
  • Control Systems Theory
  • Robotics

Background:

  • Multi-spacecraft systems require precise attitude coordination for complex missions.
  • Unknown external disturbances pose significant challenges to attitude control.
  • Existing methods may have limitations regarding initial conditions or convergence times.

Purpose of the Study:

  • To develop a fixed-time attitude coordinated control strategy for multi-spacecraft systems.
  • To address the challenge of unknown external disturbances in attitude control.
  • To eliminate dependence on initial conditions for spacecraft attitude tracking.

Main Methods:

  • A distributed fixed-time observer is designed to estimate virtual leader states.
  • A novel nonsingular fixed-time sliding mode tracking controller is proposed.
  • Sliding mode control principles are utilized for disturbance rejection.

Main Results:

  • The observer achieves complete leader tracking in a fixed time, independent of initial states.
  • The proposed controller enables fixed-time attitude tracking without initial condition requirements.
  • Each spacecraft precisely tracks desired attitude trajectories despite external disturbances.

Conclusions:

  • The developed algorithms effectively achieve fixed-time attitude coordination for multi-spacecraft systems.
  • The method demonstrates robustness against unknown external disturbances.
  • Numerical simulations validate the proposed control strategies' effectiveness.