Turbulence modeling and estimation for AO systems

Alessandro Beghi; Angelo Cenedese; Andrea Masiero

doi:10.1117/12.926019

13 September 2012 Turbulence modeling and estimation for AO systems

Alessandro Beghi, Angelo Cenedese, Andrea Masiero

Proceedings Volume 8447, Adaptive Optics Systems III; 844718 (2012) https://doi.org/10.1117/12.926019
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Nowadays, the adaptive optics (AO) system is of fundamental importance to reduce the effect of atmospheric turbulence on the images formed on large ground telescopes. In this paper the AO system takes advantage of the knowledge of the current turbulence characteristics, that are estimated by data, to properly control the deformable mirrors. The turbulence model considered in this paper is based on two assumptions: considering the turbulence as formed by a discrete set of layers moving over the telescope lens, and each layer is modeled as a Markov-Random-Field. The proposed Markov-Random-Field approach is exploited for estimating the layers' characteristics. Then, a linear predictor of the turbulent phase, based on the computed information on the turbulence layers, is constructed. Since scalability and low computational complexity of the control algorithms are important requirements for real AO systems, the computational complexity properties of the proposed model are investigated. Interestingly, the proposed model shows a good scalability and an almost linear computational complexity thanks to its block diagonal structure. Performances of the proposed method are investigated by means of some simulations.

Citation Download Citation

Alessandro Beghi, Angelo Cenedese, and Andrea Masiero "Turbulence modeling and estimation for AO systems", Proc. SPIE 8447, Adaptive Optics Systems III, 844718 (13 September 2012); https://doi.org/10.1117/12.926019

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