13 September 2012 Evidence that wind prediction with multiple guide stars reduces tomographic errors and expands MOAO field of regard
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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.
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S. Mark Ammons, S. Mark Ammons, Lisa Poyneer, Lisa Poyneer, Donald T. Gavel, Donald T. Gavel, Renate Kupke, Renate Kupke, Claire E. Max, Claire E. Max, Luke Johnson, Luke Johnson, } "Evidence that wind prediction with multiple guide stars reduces tomographic errors and expands MOAO field of regard", Proc. SPIE 8447, Adaptive Optics Systems III, 84471U (13 September 2012); doi: 10.1117/12.927283; https://doi.org/10.1117/12.927283
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