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An Improved Wavefront Control Algorithm for Large Space TelescopesWavefront sensing and control is required throughout the mission lifecycle of large space telescopes such as James Webb Space Telescope (JWST). When an optic of such a telescope is controlled with both surface-deforming and rigid-body actuators, the sensitivity-matrix obtained from the exit pupil wavefront vector divided by the corresponding actuator command value can sometimes become singular due to difference in actuator types and in actuator command values. In this paper, we propose a simple approach for preventing a sensitivity-matrix from singularity. We also introduce a new "minimum-wavefront and optimal control compensator". It uses an optimal control gain matrix obtained by feeding back the actuator commands along with the measured or estimated wavefront phase information to the estimator, thus eliminating the actuator modes that are not observable in the wavefront sensing process.
Document ID
20150008606
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Sidick, Erkin
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Basinger, Scott A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Redding, David C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 20, 2015
Publication Date
June 23, 2008
Subject Category
Optics
Numerical Analysis
Instrumentation And Photography
Meeting Information
Meeting: SPIE Conference on Astronomical Instrumentation
Location: Marseille
Country: France
Start Date: June 23, 2008
End Date: June 28, 2008
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
adaptive optics
deformable mirrors
space telescopes
Wave-front sensing and control

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