Koopman Operator-Based Data-Driven Identification of Tethered Subsatellite Deployment Dynamics
Publication: Journal of Aerospace Engineering
Volume 36, Issue 4
Abstract
Compact tether-based actuation is a suitable approach for the deployment of femto/picosatellite bodies from CubeSats using ultrasmall electrodynamic tethers for fuel-free propulsion and deorbiting. Despite the advantages of tethered satellite systems, control technologies for these have yet to mature in several domains including robustness to structural faults and unmodeled dynamics. A proposed solution for the identification of disturbances to tethered satellite dynamics is to use a data-driven algorithm to learn the system’s behavior over previous orbits and then provide an estimated prediction for the evolution of system states. To achieve the goal of state prediction via a globally linearized system model, this paper employs the Koopman operator constructed from observed dynamics to extrapolate future motion of a tethered subsatellite subject to unknown disturbances while being deployed from its mothership. Numerical simulations of the constructed model versus the nonlinear model of the tethered satellite system demonstrate the effective prediction capabilities of the proposed Koopman operator-based numerical algorithm for the general flight characteristics many orbits into the future.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was partially funded by the Michigan Space Grant Consortium, NASA: #NNX15AJ20H.
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Journal of Aerospace Engineering
Volume 36 • Issue 4 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 23, 2022
Accepted: Jan 30, 2023
Published online: Mar 25, 2023
Published in print: Jul 1, 2023
Discussion open until: Aug 25, 2023
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