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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

On-sky results for adaptive optics control with data-driven models on low-order modes Thumbnail


Baptiste Sinquin

Léonard Prengere

Caroline Kulcsár

Henri-Francois Raynaud

Eric Gendron

Alastair Basden

Jean-Marc Conan

Lisa Bardou

Lazar Staykov

Tim Morris

Tristan Buey

Fanny Chemla

Matthieu Cohen


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.


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.

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


Published Journal Article (2.2 Mb)

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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