Modeling and prediction of turbulence-induced wavefront distortions

Conference paper (2010)
Department
Delft Centre for Systems and Control (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: ©2010 Fraanje, R.; Doelman, N.
DOI: https://doi.org/doi:10.1117/12.858076
Turbulence modeling, Kalman filter, autoregressive model, 1-step ahead predictor, Optimal control, adaptive optics
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Published Date

31-12-2010

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Source:

Proceedings of SPIE, 2010 vol. 7736

ISSN:

0277-786X

Faculty

Mechanical, Maritime and Materials Engineering

Department

Delft Centre for Systems and Control

Abstract

In recent years various researchers have proposed an optimal control approach for the rejection of turbulence-induced wavefront distortions in an AO system. The essential element in the design of an optimal controller is the choice for the turbulence model, which predicts the turbulence to compensate for the inherent delay in the AO control loop. In this paper various models as proposed in literature are considered; ranging from first order temporal models to high-order full spatialtemporal models. The various models are analyzed and the resulting 1-step ahead predictors are derived. The performance of the predictors are compared for a von Karman type of turbulence with frozen flow propagation in and time-varying propagation directions.

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