First laboratory validation of LQG control with the CANARY MOAO pathfinder

Gaetano Sivo 1 Henri-François Raynaud 1 Jean-Marc Conan Caroline Kulcsár 1 Eric Gendron Fabrice Vidal Alastair Basden
1 L2TI - Laboratoire de Traitement et Transport de l'Information
Abstract : Many concepts of Wide Field AO (WFAO) systems are under development, especially for Extremely Large Tele­ scopes (ELTs) instruments. Multi-Object Adaptive Optics (MOAO) is one of these WFAO concepts, well suited to high redshifts galaxies observations in very wide Field of View (FoV). The E-ELT instrument EAGLE will use this approach. CANARY, the on-sky pathfinder for MOAO, has obtained the first compensated images on Natural Guide Stars (NGSs) at the William Herschel Telescope in September 2010. We present in this paper numerical and experimental validations of a Linear Quadratic Gaussian (LQG) control. This is an appealing strategy that provides an optimal control in the sense of minimum residual phase variance. It also provides a unified formalism that allows accounting for multi WaveFront Sensors (WFSs) channels, both on Laser Guide Stars (LGSs) and NGSs, and for various disturbance sources (turbulence, vibrations). We show how the specific MOAO CANARY configuration can be embedded in a state-space framework. We present experimental laboratory validations that demonstrate the gain brought by tomographic LQG control for CANARY, together with comparative simulations. Model identification necessary for a robust on-sky operation is discussed.
Type de document :
Communication dans un congrès
Astronomical Telescopes+ Instrumentation, Adaptive Optics Systems III, 2012, Amsterdam, Netherlands. 8447, pp.84472Y, 2012, Proc. SPIE. 〈10.1117/12.926257〉
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https://hal-iogs.archives-ouvertes.fr/hal-01395579
Contributeur : Caroline Kulcsár <>
Soumis le : jeudi 10 novembre 2016 - 23:02:51
Dernière modification le : mercredi 6 février 2019 - 01:25:46

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IOGS | TDS-MACS | L2TI | PARISTECH | UNIV-PARIS13 | USPC | GALILE

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Gaetano Sivo, Henri-François Raynaud, Jean-Marc Conan, Caroline Kulcsár, Eric Gendron, et al.. First laboratory validation of LQG control with the CANARY MOAO pathfinder. Astronomical Telescopes+ Instrumentation, Adaptive Optics Systems III, 2012, Amsterdam, Netherlands. 8447, pp.84472Y, 2012, Proc. SPIE. 〈10.1117/12.926257〉. 〈hal-01395579〉

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