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Wavefront controls for a large submillimeter-wave observatory

Redding, David and Lou, John Z. and Kissil, Andy and Bradford, Matt and Padin, Steve and Woody, David (2010) Wavefront controls for a large submillimeter-wave observatory. In: Ground-based and Airborne Telescopes III. Proceedings of SPIE. No.7733. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 773329. ISBN 978-0-81948-223-5.

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The 25-m aperture Cornell Caltech Atacama Telescope (CCAT) will have a primary mirror that is divided into 162 individual segments, each of which is equipped with 3 positioning actuators. This paper presents a mathematical description of the telescope, its actuators and sensors, and uses it to derive control laws for figure maintenance. A Kalman Filter-based Optical State Estimator is used to continuously estimate the aberrations of the telescope; these are used in a state-feedback controller to maintain image quality. This approach provides the means to correct for the optical effects of errors that occur in un-actuated degrees of freedom, such as lateral translations of the segments. The control laws are exercised in Monte Carlo and simulation analysis, to bound the closed-loop performance of the telescope and to conduct control design trades.

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Additional Information:© 2010 SPIE The International Society for Optical Engineering. This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Funding AgencyGrant Number
Subject Keywords:Segmented mirror, wavefront control, edge sensors, Kalman filter
Series Name:Proceedings of SPIE
Issue or Number:7733
Record Number:CaltechAUTHORS:20161031-141458642
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Official Citation:David Redding ; John Z. Lou ; Andy Kissil ; Matt Bradford ; Steve Padin ; David Woody; Wavefront controls for a large submillimeter-wave observatory. Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773329 (August 04, 2010); doi:10.1117/12.858097.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71629
Deposited By: Ruth Sustaita
Deposited On:31 Oct 2016 23:59
Last Modified:03 Oct 2019 16:09

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