Rejecting the low-frequency noise in the 10m diameter primary mirror of the GRANTECAN telescope

Author

Acosta, Leopoldo ; Sigut, Marta ; Méndez, Juan A. ; Hamilton, Alberto ; Marichal, Graciliano N. ; Torres, Santiago ; Moreno, Lorenzo

Author_Institution

Dept. of Appl. Phys., Univ. of La Laguna, Tenerife, Spain

fYear

2001

fDate

2001

Firstpage

1002

Lastpage

1007

Abstract

The goal of this paper is to provide an overview of the studies that have been done with the aim of finding a controller that solves the noise rejection problem in the 10m diameter primary mirror of the Grantecan Telescope. In the first place, a method for decoupling the dynamics of this large-scale MIMO system is presented. A change of basis makes the decoupling possible, becoming an important result for control purposes. In addition to this, the possibility of making tests with a scale model of the mirror is specially interesting thanks to the decoupling. Secondly, this scale model is described and its dynamic identified using an ARMAX model. Finally, a discussion about the design of a controller for low-frequency noise rejection in the scale model´s segments and the results obtained are presented

Keywords

MIMO systems; astronomical telescopes; autoregressive moving average processes; control system synthesis; interference suppression; large-scale systems; mirrors; multivariable control systems; optical variables control; 10 m; ARMAX model; GRANTECAN telescope; controller design; large-scale MIMO system; low-frequency noise rejection; primary mirror; Actuators; Extraterrestrial measurements; Frequency; Image segmentation; Large-scale systems; Low-frequency noise; Mirrors; Optical design; Telescopes; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Control Applications, 2001. (CCA '01). Proceedings of the 2001 IEEE International Conference on

Conference_Location

Mexico City

Print_ISBN

0-7803-6733-2

Type

conf

DOI

10.1109/CCA.2001.974001

Filename

974001