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High performance controllers towards ELT-sized adaptive optics systems

Abstract : Adaptive Optics (AO) systems compensate the nefari-ous effects of atmospheric turbulence affecting image formation on ground-based telescopes. Deformable Mirrors (DMs) are inserted in the telescope optical path to correct for the deformations induced by turbulence, in real-time, using Wave Front Sensor (WFS) measurements. The upcoming AO systems for ELTs (Extremely Large Telescopes) will feature a huge number of WFS measurements and DM actuators, and the design of high performance controllers adapted to these dimensions is a real challenge. In this article we compare the performance of several controllers: standard integral action, LQG (Linear Quadratic Gaussian) based on Kalman filter, and a highly paralleliz-able LQG based on Distributed Kalman Filter (DKF), which is built on Fourier domain models. Performance evaluation for a Single Conjugated AO (SCAO) configuration of a VLT-like telescope (8m) allows to discuss the extension to ELT-size high performance controllers.
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Submitted on : Wednesday, April 11, 2018 - 4:51:13 PM
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  • HAL Id : hal-01763017, version 1


Léonard Prengère, Caroline Kulcsár, Henri-François Raynaud, Jean-Marc Conan. High performance controllers towards ELT-sized adaptive optics systems. 8th International Symposium on Optronics In Defence And Security (OPTRO 2018), Feb 2018, Paris, France. ⟨hal-01763017⟩



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