Content-type: text/html Manpage of blcal

blcal

Section: User Commands (1)
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NAME

blcal - Compute and apply baseline calibration.  

PERSON RESPONSIBLE

rjs  

CATEGORIES

uv analysis  

DESCRIPTION

BLCAL computes and applies baseline-based calibration to a visibility dataset.

This reads two datasets. It uses the first dataset to determine baseline-based calibration, and applies these calibration corrections to the second dataset.  

PARAMETERS

vis
Normally, this gives the name of two visibility datasets, being the "reference" and the "source" datasets respectively. The reference dataset is used to determine the baseline calibration, whereas the source contains the data that is corrected and written out. If only a single dataset is given, then this is self-calibrated. Baseline-based self-calibration is a very dubious operation, and generally should not be performed.

Note: Both the reference and source datasets should be in time order.

select
The normal uv selection commands -- see the help on "select" for more information. This selection is applied to both the reference and source input datasets.
line
The normal uv linetype in the form:
  line,nchan,start,width,step
See the help on "line" for more information. The default is all channels (or all wide channels if there are no spectral channels). The output will consist of only spectral or wideband data (but not both).
stokes
Normal Stokes/polarisation processing. See the help on "stokes" for more information. The default is to use the Stokes/polarisations present in the dataset.
interval
Solution time interval, in minutes. The default is 5 minutes.
out
The name of the output uv data set. No default.
options
Extra processing options. Possible values are:
  nopassol  Determine a solution which is independent of channel number.
  nopolsol  Solve for parallel-hand polarisations only. When
            applying corrections, cross-hand correlations get corrected
            with a parallel-hand gain. In particular XY and YX are
            corrected with the mean of the XX and YY gains; RL and LR
            are corrected with the mean of RR and LL gains; Q,U, and V
            are corrected with the I gain.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

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Time: 18:35:38 GMT, July 05, 2011