Although many of these calibration parameters are antenna based,
CLIC is able to keep simultaneously two values for these parameters:
an antenna-based value and a baseline-based value. Whenever an
antenna-based calibration function is computed (i.e. a part of the
, or of the
), CLIC offers the possibility of solving
for an antenna-based or a baseline-based function. In general, solving
for antenna based parameters should be preferred, since this mode
offers less free parameters (so that they are better constrained) and
uses a priori knowledge of the instrument (e.g. the phase closure
relations). However, in some cases, well-identified baseline-related
problems make it difficult to calibrate in antenna-based mode, so it
may be needed to look for baseline-based solutions, mainly for
amplitude or phase calibration.