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Advanced control of low order modes in laser guide star multi-conjugate adaptive optics systems

Correia, Carlos and Véran, Jean-Pierre and Herriot, Glen and Ellerbroek, Brent and Wang, Lianqi and Gilles, Luc (2012) Advanced control of low order modes in laser guide star multi-conjugate adaptive optics systems. In: Adaptive Optics Systems III. Proceedings of SPIE. Vol.8447. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 84471S. ISBN 9780819491480.

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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.

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Additional Information:© 2012 Society of Photo-optical Instrumentation Engineers (SPIE).
Subject Keywords:Minimum-variance reconstruction, tilt anisoplanatism, Kalman filtering, Atmospheric tomography
Series Name:Proceedings of SPIE
Record Number:CaltechAUTHORS:20180619-153918164
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Official Citation:Carlos Correia, Jean-Pierre Véran, Glen Herriot, Brent Ellerbroek, Lianqi Wang, Luc Gilles, "Advanced control of low order modes in laser guide star multi-conjugate adaptive optics systems", Proc. SPIE 8447, Adaptive Optics Systems III, 84471S (13 September 2012); doi: 10.1117/12.926872;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87240
Deposited By: Tony Diaz
Deposited On:19 Jun 2018 22:46
Last Modified:15 Nov 2021 20:46

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