Minimum-Variance Control for Astronomical Adaptive Optics with Resonant Deformable Mirrors

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Correia, C (Autor) Outra; Raynaud, HF (Autor) Outra; Kulcsár, C (Autor) Outra; Conan, JM (Autor) Outra

Revista

Título: European Journal of Control

Vol. 17 Nº 1

Páginas: 222-236

ISSN: 0947-3580

Editora: LAVOISIER

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 7 Citações

Outras Informações

ID Authenticus: P-009-FZ2

DOI: 10.3166/ejc.17.222-236

Abstract (EN): Adaptive Optics (AO) systems use a Deformable Mirror (DM) to counter in real-time the nefarious effects of atmospheric turbulence on ground-based telescope imaging. This article presents a brief historical overview of AO design, seen as a strongly multi-variable Minimum- Variance (MV) disturbance rejection problem associated with a hybrid continuous/discrete time MV control problem. It is shown that for a wide class of LTI DM and turbulence models, this hybrid MV problem can be transformed into an equivalent discrete-time LQG formulation. A discrete-time stochastic model enables to compute the optimal control in standard reconstructed feedback form and to evaluate performance degradation for simpler sub-optimal solutions. An example of tip-tilt DM control for the European Extremely Large Telescope (E-ELT) is presented. © 2011 EUCA.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 15