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Proceedings Paper

Wavefront controls for a large submillimeter-wave observatory
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Paper Abstract

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.

Paper Details

Date Published: 4 August 2010
PDF: 11 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773329 (4 August 2010); doi: 10.1117/12.858097
Show Author Affiliations
David Redding, Jet Propulsion Lab. (United States)
John Z. Lou, Jet Propulsion Lab. (United States)
Andy Kissil, Jet Propulsion Lab. (United States)
Matt Bradford, Jet Propulsion Lab. (United States)
Steve Padin, California Institute of Technology (United States)
David Woody, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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