Commands COLLECT and DERIVE are typically used to improve wide-
bandwidth self-calibration solutions. At NOEMA, a self-calibration solu-
tion can be computed independently for each of the 4 Wide band UV table.
Assume these are stored in Wide-'i'-phase-sol.gdf, with i varying from 1
to 4.
COLLECT Wide-phase*.gdf Cont-sol.gdf
DERIVE Cont-sol.gdf Cont-cgains.uvt
READ CGAINS Cont-cgains.uvt
FOR I 1 to 4
READ UV Wide-'i'.uvt
APPLY DELAY /FLAG
WRITE UV Self-Wide-'i'.uvt
NEXT
will average the (antenna-based) Phase calibration solutions (COLLECT)
and compute the corresponding Baseline-based gains (DERIVE). The loop
then applies this better self-calibration solution to each UV table,
scaling the Phases according to Frequency.
Gildas manager
2023-06-01