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The goal of the calibration is to estimate and correct for the
instrumental gain in order to have an unbiased estimate of the true
visibilities. We use a simplified version of the radiointerferometry
measurement equation. The (complex) visibility
measured on the baseline from antenna
to antenna
at frequency
channel
is related to the true object visibility
by

(1) 
where
and
are the spatial frequencies corresponding
to baseline
at time
and frequency
, and we assume the
object has a flat spectrum. Calibrating the data is computing the
complex ``calibration curves''
and
.
Gildas manager
20220117