Context. The GRAVITY instrument was commissioned on the VLTI in 2016 and is now
available to the astronomical community. It is the first optical interferometer capable of …

Adaptive optics provides real time correction of wavefront disturbances on ground based
telescopes. Optimizing control and performance is a key issue for ever more demanding …

Atmospheric wavefront prediction based on previous wavefront sensor measurements can
greatly enhance the performance of adaptive optics systems. We propose an optimal linear …

Adaptive optics (AO) has become an indispensable tool for ground-based telescopes to
mitigate atmospheric seeing and obtain high angular resolution observations. Predictive …

In the ground-based astronomical telescope, the imaging quality is usually affected by tip-tilt
vibrations induced by the telescope structure. Long exposure time of the image sensor is …

The objective of this study was to evaluate the performance of the different systems and
techniques aimed at suppressing vibrations on optical ground-based telescopes. We …

This article proposes a fractional repetitive control (FRC) based on Youla parameterization
to reject arbitrary disturbances up to the Nyquist frequency. This control strategy transforms …

Abstract Mechanical vibrations in Tip-Tilt modes affect the closed-loop performance of
astronomical telescopes. Large integration time of the image sensor can restrict the Tip-Tilt …

Adaptive optics systems are an essential technology for the modern astronomy for ground-
based telescopes. One of the most recent revolution in the field is the introduction of the …

In this paper, we develop a new method based on Youla-Kucera parameterization in
frequency domain to reduce tip and tilt vibrations of astronomical telescopes. This proposed …