The objective
of this work package is to develop and analyze algorithms for phase tracking/delay
estimation and group delay tracking. This analysis could be applied to the current
VLTI hardware and also to the VLTI infrastructure feeding a superior fringe
tracker utilizing a photon-counting NIR detector (such as the Super Tunnel Junction).
The goal would be to enable fringe tracking (and thus coherent integration)
using the faintest possible reference star. To reach this objective, a study
is conducted described as analysis, development, and testing (using simulated
data) of fringe tracking algorithms for interferometric instruments using spectrally
dispersed detection.