| DOI | Trouver le DOI : https://doi.org/10.1117/12.926872 |
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| Auteur | Rechercher : Correia, C.1; Rechercher : Véran, J.-P.1; Rechercher : Herriot, G.1; Rechercher : Ellerbroek, B.; Rechercher : Wang, L.; Rechercher : Gilles, L. |
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| Affiliation | - Conseil national de recherches du Canada. Institut Herzberg d'astrophysique du CNRC
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| Format | Texte, Article |
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| Conférence | Adaptive Optics Systems III, July 1-6, 2012, Amsterdam, the Netherlands |
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| Sujet | Advanced control; Anisoplanatism; Atmospheric tomography; Double integrator; Kalman-filtering; Laser guide star; Low order; Lower bounds; Modal gain; Multi-conjugate adaptive optics systems; Parameter optimisation; Thirty Meter Telescope; Lasers; Mineralogy; Optimization; Stars |
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| Résumé | Laser-guide-star-based multi-conjugate adaptive optics (MCAO) systems require natural guide-stars to measure tilt and tilt-anisoplanatism modes. This paper focuses on the parameter optimisation of sub-optimal integrator-based controllers using a single and a double integrator (baseline option) to drive the low-order loop of NFIRAOS, the 1st light MCAO system for the Thirty-Meter Telescope. The minimum-variance (MV) controller is outlined, against which integrators are compared. Simulations using ∼500 asterisms considered in sky-coverage simulations for the TMT show that the double integrator gives competitive results thoughout the range of asterisms and magnitudes considered. It is shown that using an optimal modal gain integrator can further improve the performance with respect to using an averaged gain for all of part of the modes. However, it is outperformed by the MV controller, in particular for asterisms with relatively dim stars (lower bound is magnitude 22 in H-band) requiring low temporal frame-rates (as low as 16Hz) to integrate more flux. Over all the cases tested, an average of ∼100 nm rms (23 nm rms median) improvement can be achieved with the MV. The MV further increases by 15% the probability of working below the 50th-percentile residual of the double integrator. © 2012 SPIE. |
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| Date de publication | 2012 |
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| Maison d’édition | SPIE |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 21269178 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 14337dcd-f395-43c7-8ad2-58e594044b2d |
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| Enregistrement créé | 2013-12-12 |
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| Enregistrement modifié | 2020-04-21 |
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