The PRIMA fringe sensor unit

@article{Sahlmann2009ThePF,
  title={The PRIMA fringe sensor unit},
  author={Johannes Sahlmann and S{\'e}rge M{\'e}nardi and Roberto Abuter and Matteo Accardo and Sergio Mottini and Francoise Delplancke Eso and Observatoire de Geneve and Thales Alenia Space},
  journal={Astronomy and Astrophysics},
  year={2009},
  volume={507},
  pages={1739-1757}
}
Context. The fringe sensor unit (FSU) is the central element of the phase referenced imaging and micro-arcsecond astrometry (PRIMA) dual-feed facility and provides fringe sensing for all observation modes, comprising off-axis fringe tracking, phase referenced imaging, and high-accuracy narrow-angle astrometry. It is installed at the Very Large Telescope Interferometer (VLTI) and successfully served the fringe-tracking loop during the initial commissioning phase. Aims. To maximise sensitivity… 
First results from fringe tracking with the PRIMA fringe sensor unit
TLDR
The fringe sensor unit (FSU), the central element of the phase referenced imaging and micro-arcsecond astrometry (PRIMA) dual-feed facility for the Very Large Telescope interferometer (VLTI), is undergoing commissioning and preparation for science operation.
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Simulation of Kalman-filter fringe tracking with on-sky measurements of the PRIMA Fringe Sensor Unit
TLDR
The Kalman algorithm as a fringe tacker for GRAVITY is validated and it is found that tracking with the Kalman controller is more efficient than with the PRIMA FSU for all archive data provided by ESO.
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