7 August 2014 Anti-windup control of tip-tilt mirror
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In the context of next generation instrumentation for current telescope and future Extremely Large Telescopes (ELT), the requirements on the correction of the tip-tilt modes are stringent. In a strong turbulence situation and in the presence of structural vibration of the telescope, tip-tilt mirror saturation phenomena can occur, which can degrade the performance or even destabilize the feedback system that is denoted the windup" effects. In this paper we investigate a control strategy which aims to mitigate the undesirable windup" effects. The approach gives possibilities to ensure the performance of a relevant anti-windup" control strategy invoking the small gain theorem and using the H optimization framework. The proposed control method, based on Hoptimization, guarantees the stability and performance of the tip-tilt loop.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean-Pierre Folcher, Jean-Pierre Folcher, } "Anti-windup control of tip-tilt mirror", Proc. SPIE 9148, Adaptive Optics Systems IV, 91484H (7 August 2014); doi: 10.1117/12.2056357; https://doi.org/10.1117/12.2056357

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