EAS Publications Series
Volume 59, 2013New Concepts in Imaging: Optical and Statistical Models
|Page(s)||93 - 130|
|Section||Physical Bases and New Challenges in High Resolution Imaging|
|Published online||13 March 2013|
D. Mary, C. Theys and C. Aime (eds)
EAS Publications Series, 59 (2013) 93-130
Adaptive Optics Feedback Control
UMR 7293, Lagrange Université de Nice
Sophia-Antipolis/CNRS/Observatoire de la Côte d’Azur, Parc Valrose, 06108
Nice Cedex 2,
This paper concentrates on the control aspects of Adaptive Optics (AO) systems and includes a prior exposure to linear control systems from the “classical” point of view. The AO control problem is presented and the well-established optimized modal gain integral control approach is discussed. The design of a controller from a modern control point of view is addressed by means of a linear quadratic Gaussian control methodology. The proposed approach emphasizes the ability of the adaptive optics loop to reject the atmospheric aberration. We derive a diagonal state space system which clearly separates the dynamics of the plant (deformable mirror & wavefront sensor) from the disturbance dynamics (atmospheric model). This representation facilitates the numerical resolution of the problem. A frequency analysis is carried out to check performance and robustness specifications of the multiple-input multiple-output feedback system. The effectiveness of the approach is demonstrated through numerical experiments.
© EAS, EDP Sciences 2013
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