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Proceedings Paper

Simulation of Kalman-filter fringe tracking with on-sky measurements of the PRIMA Fringe Sensor Unit
Author(s): Élodie Choquet; Roberto Abuter; Jonathan Menu; Guy Perrin; Pierre Fédou
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Paper Abstract

GRAVITY is a second generation instrument for the VLTI that will combine four telescopes in the K band. To achieve astrometric precision of 10μas and angular resolution of 4mas for objects with magnitude up to K=16 in the science beam, its fringe tracker will stabilize fringes to 350nm rms on a reference star as faint as K=10. To efficiently correct both atmospheric piston and longitudinal vibrations, we developed a controller based on Kalman filtering, which is a predictive algorithm providing optimized commands based on a model of the disturbances. In order to validate the Kalman algorithm as a fringe tacker for GRAVITY, we performed numerical simulations of 2-telescope fringe tracking with a Kalman controller with on-sky measurements from the PRIMA Fringe Sensor Unit (FSU). We find that tracking with the Kalman controller is more efficient than with the PRIMA FSU for all archive data provided by ESO. We deduced an average gain of 170nm rms over the residual OPD using the PRIMA FSU.

Paper Details

Date Published: 12 September 2012
PDF: 8 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452Y (12 September 2012); doi: 10.1117/12.925578
Show Author Affiliations
Élodie Choquet, LESIA - Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie, Univ. Paris-Diderot (France)
Groupement d'intérêt Scientifique PHASE (France)
Roberto Abuter, European Southern Observatory (Germany)
Jonathan Menu, Katholieke Univ. Leuven (Belgium)
Guy Perrin, LESIA - Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie, Univ. Paris-Diderot (France)
Groupement d'intérêt Scientifique PHASE (France)
Pierre Fédou, LESIA - Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie, Univ. Paris-Diderot (France)
Groupement d'intérêt Scientifique PHASE (France)


Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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