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Basic Information on wvcal
Task: wvcal
Purpose: Estimate antenna gains from WVR measurements.
Categories: calibration, atmospheric phase
WVCAL estimates atmospheric phase corrections
from WVR measurements. The WVR data are interpolated
to the integration times of the interferometer data
and written into the gains item.
Key: vis
Name of input uv-data file. No default.
Key: wvr
Name of input WVR data files. WVCAL looks for filenames
wvrN, where N=1,nants. The phase correction is set to zero
if no WVR data file is found for any antenna. No default.
Key: pgain
`pgain' gives the antenna phase change with WVR path length in
in units of radians/millimeter. Default = 0. calculates
-2pi/lambda radians/millimeter from the observing frequency.
Key: interval
The length of time, in minutes, of a gain solution.
Default uses the interferometer integration interval,
but use a larger value in cases of poor signal to noise, or
if the atmosphere and instrument is fairly stable.
Key: timeoff
time offset in seconds for each antenna.
Key: out
Name of output uv-data file. The default is to write the gain
corrections into the input visibility file.
Key: device
PGPLOT device to plot mmpath versus airmass. Default is no plot.
Key: airmass
airmass range (min,max) to use.
default=1,5
Key: mmpath
mmpath range (min,max) to use.
default=0,1000.
Key: options
Extra processing options. Several can be given, separated by
commas. Minimum match is used. Possible values are:
filter Filter out data more than 2 sigma from the mean path.
scale Scale the measured path by the slope for each antenna.
subtract Subtract the average for each antenna.