Fringe tracking control model. Top: for each telescope, the residual piston error e corresponds to the fringe tracking command c removed from the piston disturbance d. The fringe sensor measures differential piston on baselines and introduces noise n. The layout of the fringe sensor is contained in the T2B matrix that converts the individual pistons at the level of the telescopes into the differential piston at the level of the fringe sensor baselines.
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