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Proceedings Paper

GRAVITY: design and performance of the fringe tracker
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Paper Abstract

GRAVITY is a second generation instrument for the VLTI. It will combine four telescopes in the K band and perform fringe tracking on stars as faint as 10 magnitude with a lambda/8 accuracy, thus counterbalancing atmospheric piston and UTs longitudinal vibrations, despite flux drop-outs due to residual tip-tilt jitter. To achieve such a performance, new developments have to be tested. We have developed a complete simulator so as to improve algorithms and establish an efficient fringe tracking strategy. In addition, a prototype of the fringe tracker for GRAVITY is being built up in order to demonstrate the results of this simulator. We present here the current status of these developments, achieved by simulating realistic tracking at VLTI.

Paper Details

Date Published: 21 July 2010
PDF: 13 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77341Z (21 July 2010); doi: 10.1117/12.855984
Show Author Affiliations
E. Choquet, LESIA, Observatoire de Paris à Meudon (France)
Groupement d'intérêt Scientifique PHASE (France)
F. Cassaing, ONERA/DOTA (France)
Groupement d'intérêt Scientifique PHASE (France)
G. Perrin, LESIA, Observatoire de Paris à Meudon (France)
Groupement d'intérêt Scientifique PHASE (France)
F. Eisenhauer, Max-Planck-Institut für extraterrestrische Physik (Germany)
W. Brandner, Max-Planck-Institut für Astronomie (Germany)
C. Straubmeier, Univ. zu Köln (Germany)
K. Perraut, Lab. d'Astrophysique, Observatoire de Grenoble (France)
S. Gillessen, Max-Planck-Institut für extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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