10 July 2008 Acceleration feedback control on an AT
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Abstract
he VLT observatory operated by ESO is located on Cerro Paranal in Chile and consists of four identical 8-m telescopes and four 1.8-m VLTI Auxiliary telescopes (ATs). In order to further improve the tracking axes performance of telescopes regarding wind rejection, different control techniques have been evaluated. Ongoing investigation and studies show that by measuring the acceleration and using that in appropriate control strategy the performance of telescope tracking in face of external perturbation can be improved. The acceleration signal contains the non filtered information (advanced phase compared to velocity and position) of the perturbation load, e.g. wind load. As a result the reaction of the control is faster and hence the perturbation rejection is more efficient. In this paper, two acceleration feedback techniques are discussed and the results of the measurement test on an AT telescope are presented.
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B. Sedghi, B. Sedghi, B. Bauvir, B. Bauvir, M. Dimmler, M. Dimmler, } "Acceleration feedback control on an AT", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70121Q (10 July 2008); doi: 10.1117/12.789333; https://doi.org/10.1117/12.789333
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