Baptiste Sinquin
On-sky results for adaptive optics control with data-driven models on low-order modes
Sinquin, Baptiste; Prengere, Léonard; Kulcsár, Caroline; Raynaud, Henri-Francois; Gendron, Eric; Osborn, James; Basden, Alastair; Conan, Jean-Marc; Bharmal, Nazim; Bardou, Lisa; Staykov, Lazar; Morris, Tim; Buey, Tristan; Chemla, Fanny; Cohen, Matthieu
Authors
Léonard Prengere
Caroline Kulcsár
Henri-Francois Raynaud
Eric Gendron
Dr James Osborn james.osborn@durham.ac.uk
Associate Professor
Alastair Basden
Jean-Marc Conan
Dr Nazim Bharmal n.a.bharmal@durham.ac.uk
Senior Adaptive Optics Scientist
Lisa Bardou
Lazar Staykov
Tim Morris
Tristan Buey
Fanny Chemla
Matthieu Cohen
Abstract
Dedicated tip-tilt loops are commonly implemented on adaptive optics (AO) systems. In addition, a number of recent high-performance systems feature tip-tilt controllers which are more efficient than the integral action controller. In this context, Linear Quadratic Gaussian (LQG) tip-tilt regulators based on stochastic models identified from AO telemetry have demonstrated their capacity to effectively compensate for the cumulated effects of atmospheric disturbance, windshake and vibrations. These tip-tilt LQG regulators can also be periodically re-tuned during AO operations, thus allowing to track changes in the disturbances’ temporal dynamics. This paper investigates the potential benefit of extending the number of low-order modes to be controlled using models identified from AO telemetry. The global stochastic dynamical model of a chosen number of turbulent low-order modes is identified through data-driven modelling from wavefront sensor measurements. The remaining higher modes are modelled using priors with autoregressive models of order 2. The loop is then globally controlled using the optimal LQG regulator build from all these models. Our control strategy allows for combining a dedicated tip-tilt loop with a deformable mirror that corrects for the remaining low-order modes and for the higher orders altogether, without resorting to mode decoupling. Performance results are obtained through evaluation of the Strehl ratio computed on H-band images from the scientific camera, or in replay mode using on-sky AO telemetry recorded in July 2019 on the CANARY instrument.
Citation
Sinquin, B., Prengere, L., Kulcsár, C., Raynaud, H., Gendron, E., Osborn, J., …Cohen, M. (2020). On-sky results for adaptive optics control with data-driven models on low-order modes. Monthly Notices of the Royal Astronomical Society, 498(3), 3228-3240. https://doi.org/10.1093/mnras/staa2562
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 18, 2020 |
Online Publication Date | Aug 26, 2020 |
Publication Date | 2020-11 |
Deposit Date | Sep 1, 2020 |
Publicly Available Date | Oct 6, 2020 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 498 |
Issue | 3 |
Pages | 3228-3240 |
DOI | https://doi.org/10.1093/mnras/staa2562 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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