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4.4.6 Baseline-based Calibration (blcal)
You can use the blcal task to solve for baseline-dependent (non-closing) errors. WARNING: this is in general a very dangerous thing to do, since baseline-dependent errors once introduced are difficult to remove. You must be sure you have an excellent model for the source (better than the magnitude of the baseline-dependent errors).
The inputs are:
vis = ’’ # Name of input visibility file
caltable = ’’ # Name of output gain calibration table
field = ’’ # Select field using field id(s) or field name(s)
spw = ’’ # Select spectral window/channels
intent = ’’ # Select observing intent
selectdata = False # Other data selection parameters
solint = ’inf’ # Solution interval
combine = ’scan’ # Data axes which to combine for solve (scan, spw,
# and/or field)
freqdep = False # Solve for frequency dependent solutions
calmode = ’ap’ # Type of solution" (’ap’, ’p’, ’a’)
solnorm = False # Normalize average solution amplitudes to 1.0
gaintable = [’’] # Gain calibration table(s) to apply on the fly
gainfield = [’’] # Select a subset of calibrators from gaintable(s)
interp = [’’] # Interpolation mode (in time) to use for each gaintable
spwmap = [] # Spectral windows combinations to form for
# gaintables(s)
gaincurve = False # Apply internal VLA antenna gain curve correction
opacity = [] # Opacity correction to apply (nepers), per spw
parang = False # Apply parallactic angle correction
async = False # If true the taskname must be started using blcal(...)
The freqdep parameter controls whether blcal solves for “gain” (freqdep=False) or “bandpass” (freqdep=True) style calibration.
Other parameters are the same as in other calibration tasks. These common calibration parameters are described in § 4.4.1.
More information about CASA may be found at the
CASA web page
Copyright © 2010 Associated Universities Inc., Washington, D.C.
This code is available under the terms of the GNU General Public Lincense
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