Wavefront controls for a large submillimeter-wave observatory

David Redding; John Z. Lou; Andy Kissil; Matt Bradford; Steve Padin; David Woody

doi:10.1117/12.858097

4 August 2010 Wavefront controls for a large submillimeter-wave observatory

David Redding, John Z. Lou, Andy Kissil, Matt Bradford, Steve Padin, David Woody

Proceedings Volume 7733, Ground-based and Airborne Telescopes III; 773329 (2010) https://doi.org/10.1117/12.858097
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

David Redding, John Z. Lou, Andy Kissil, Matt Bradford, Steve Padin, and David Woody "Wavefront controls for a large submillimeter-wave observatory", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773329 (4 August 2010); https://doi.org/10.1117/12.858097

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