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Efficient implementation of pseudo open loop control for adaptive optics on Extremely Large Telescopes

Basden, AG; Jenkins, D; Morris, TJ; Osborn, J; Townson, MJ

Efficient implementation of pseudo open loop control for adaptive optics on Extremely Large Telescopes Thumbnail


Authors

D Jenkins



Abstract

Closed-loop adaptive optics systems which use minimum mean square error wavefront reconstruction require the computation of pseudo open loop wavefront slopes. These techniques incorporate a knowledge of atmospheric statistics which must therefore be represented within the wavefront slope measurements. These pseudo open loop slopes are computed from the sum of the measured residual slopes and the reconstructed slopes that would be given if the deformable mirror was flat, generally involving the multiplication of an interaction matrix with actuator demands from the previous time-step. When using dense algebra, this multiplication is computationally expensive for Extremely Large Telescopes, requiring a large memory bandwidth. Here we show that this requirement can be significantly reduced, maintaining mathematical correctness and significantly reducing system complexity. This therefore reduces the cost of these systems and increases robustness and reliability.

Citation

Basden, A., Jenkins, D., Morris, T., Osborn, J., & Townson, M. (2019). Efficient implementation of pseudo open loop control for adaptive optics on Extremely Large Telescopes. Monthly Notices of the Royal Astronomical Society, 486(2), 1774-1780. https://doi.org/10.1093/mnras/stz918

Journal Article Type Article
Acceptance Date Mar 27, 2019
Online Publication Date Mar 29, 2019
Publication Date Jun 30, 2019
Deposit Date Apr 4, 2019
Publicly Available Date Apr 23, 2019
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 486
Issue 2
Pages 1774-1780
DOI https://doi.org/10.1093/mnras/stz918

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative
Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium,
provided the original work is properly cited.





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