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The first atmospheric phase correction scheme was based on the total
power measured in the 1mm band (when dual-frequency observing was
available). The calibration scans are processed similarly to the
regular astronomical calibration (see section 4.8.1), then the
derivative of the path length over the emission temperature of the
atmosphere at the atmospheric monitoring frequency is computed.
It is possible to fit a straight line within a time
to
remove drift of non-atmospheric origin (such as receiver gain
variations), before computing the corrections.

As for the WVR, this correction was applied online and can only be
recomputed for the continuum units.

Gildas manager
2022-01-17