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Wavefront Controls for a Large Submillimeter-Wave ObservatoryThe 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 unactuated degrees of freedom, such as lateral translations of the segments. The control laws are exercised in Monte Carlo and covariance analysis, to bound the closed-loop performance of the telescope and to conduct control design trades.
Document ID
20150008505
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Redding, David
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lou, John Z.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kissil, Andy
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bradford, Matt
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Padin, Steve
(California Inst. of Tech. Pasadena, CA, United States)
Woody, David
(California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 20, 2015
Publication Date
June 27, 2010
Subject Category
Astronomy
Cybernetics, Artificial Intelligence And Robotics
Statistics And Probability
Meeting Information
Meeting: SPIE Astronomical Telescopes and Instrumentation 2010
Location: San Diego, CA
Country: United States
Start Date: June 27, 2012
End Date: July 2, 2012
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
edge sensors
segmented mirror
Kalman filter

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