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Velocity-free attitude coordinated tracking control for spacecraft formation flying
Qinglei Hu1, Jian Zhang2, Youmin Zhang3
1School of Automation Science and Electrical Engineering, Beihang University, Beijing, 100191, China.
ISA Transactions
|January 3, 2018
Summary
This study introduces a novel velocity-free attitude control for spacecraft formations, enabling coordinated tracking without needing angular velocity data. The method ensures stable formation control despite external disturbances.
Area of Science:
- Aerospace Engineering
- Control Systems Theory
- Robotics
Background:
- Spacecraft formations require precise attitude coordination for complex missions.
- Traditional control methods often rely on readily available angular velocity measurements, which are not always feasible.
- External disturbances can significantly impact the stability and performance of spacecraft formations.
Purpose of the Study:
- To develop a velocity-free attitude coordinated tracking control scheme for spacecraft formations.
- To address the challenge of unavailable angular velocity measurements in control feedback.
- To enhance the robustness and tracking performance of spacecraft formations under external disturbances.
Main Methods:
- An angular velocity observer is constructed using individual spacecraft attitude quaternions.
- A distributed attitude coordinated control law is designed based on observed states.
- An adaptive control method is employed to mitigate external disturbances.
- Theoretical stability analysis of the closed-loop system is performed.
Main Results:
- The proposed control scheme enables velocity-free attitude coordinated tracking.
- The system trajectory converges to a small set around the origin with a fast convergence rate.
- Numerical simulations validate the fast convergence and improved tracking performance.
- The adaptive control effectively handles external disturbances.
Conclusions:
- The velocity-free attitude coordinated tracking control is effective for spacecraft formations.
- The developed observer and adaptive control law ensure system stability and performance.
- This approach offers a robust solution for missions where angular velocity is not measurable.
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