Robust Stationkeeping Control for Libration Point Quasi-Periodic Orbits
Publication: Journal of Aerospace Engineering
Volume 21, Issue 2
Abstract
Libration orbit stationkeeping controls are designed based on selected reference quasi-periodic orbit trajectories. The baseline trajectory is designed to meet science requirements and in the same time achieve minimum fuel consumptions. The success of finding libration point reference orbits is based on accurate numerical computation, dynamics, and space environment modeling. The linear quadratic regulator controller has been developed widely for maintaining a spacecraft in such libration orbit reference trajectories as close as possible. However, any dynamics models, including the circular restricted three-body dynamics, space environment, sensor, and actuator, are only approximations of real physical systems. Any noise and uncertainties can cause spacecraft’ motion to diverge due to the high instability region around libration points. This study investigates the modeling and designing of a passive robust controller and an active adaptive linear quadratic regulator in libration point stationkeeping controls around . The adaptive law in the linear quadratic regulator is used to estimate unknown gains of spacecraft’ subsystems. The results are compared for a family of libration orbits with reasonable yearly budgets under the influence of perturbations, noise, and unmodeled dynamics. The comparison with a publicly accessible work indicates that the controller developed in this work can provide comparable annual cost by nearly even including the worst case of perturbations.
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Acknowledgments
This research work was supported by the University of Oklahoma. The guidance from Dr. B. G. Marchand regarding the orbit finding is appreciated. The writers gratefully acknowledge the reviewers and the associate editor for their useful suggestions.
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Information
Published In
Journal of Aerospace Engineering
Volume 21 • Issue 2 • April 2008
Pages: 102 - 115
Copyright
© 2008 American Society of Civil Engineers.
History
Received: Jun 20, 2006
Accepted: Sep 6, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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