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Proceedings Paper

Evidence that wind prediction with multiple guide stars reduces tomographic errors and expands MOAO field of regard
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Paper Abstract

We explore the extension of predictive control techniques to multi-guide star, multi-layer tomographic wavefront measurement systems using a shift-and-average correction scheme that incorporates wind velocity and direction. In addition to reducing temporal error budget terms, there are potentially additional benefits for tomographic AO systems; the combination of wind velocity information and phase height information from multiple guide stars breaks inherent degeneracies in volumetric tomographic reconstruction, producing a reduction in the geometric tomographic error. In a tomographic simulation of an 8-meter telescope with 3 laser guide stars over 2 arcminute diameter, we find that tracking organized wind motion as it flows into metapupil regions sampled by only one guide star improves layer estimates beyond the guide star radius, allowing for an expansion of the field of view. For this case, we demonstrate improvement of layer phase estimates of 3% to 12%, translating into potential gains in the MOAO field of regard area of up to 40%. The majority of the benefits occur in regions of the metapupil sampled by only 1-2 LGS's downwind at high altitudes.

Paper Details

Date Published: 13 September 2012
PDF: 9 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84471U (13 September 2012); doi: 10.1117/12.927283
Show Author Affiliations
S. Mark Ammons, Lawrence Livermore National Lab. (United States)
Lisa Poyneer, Lawrence Livermore National Lab. (United States)
Donald T. Gavel, UCO Lick Observatory, Univ. of California, Santa Cruz (United States)
Renate Kupke, UCO Lick Observatory, Univ. of California, Santa Cruz (United States)
Claire E. Max, UCO Lick Observatory, Univ. of California, Santa Cruz (United States)
Luke Johnson, National Solar Observatory (United States)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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