pipeline.hif.cli.hif_bandpass

pipeline.hif.cli.hif_bandpass = <pipeline.hif.cli.hif_bandpass._hif_bandpass object>

hif_bandpass —- Compute bandpass calibration solutions

Compute amplitude and phase as a function of frequency for each spectral window in each MeasurementSet.

Previous calibration can be applied on the fly.

Description

hif_bandpass computes a bandpass solution for every specified science spectral window. By default a ‘phaseup’ pre-calibration is performed and applied on the fly to the data, before the bandpass is computed.

The hif_refant task may be used to precompute a prioritized list of reference antennas.

Issues

There is currently some discussion about whether or not to do an ‘ampup’ operations at the same time as the ‘phaseup’. This is not required for the bandpass computation but the amplitude information may provide a useful quality assessment measure.

The specified minsnr parameter is currently applied to the bandpass solution computation but not the ‘phaseup’ computation. Some noisy solutions in the phaseup may not be properly rejected.

Output

results – If pipeline mode is ‘getinputs’ then None is returned. Otherwise the results object for the pipeline task is returned.

——— parameter descriptions ———————————————

vis The list of input MeasurementSets. Defaults to the list of

MeasurementSets specified in the h_init or hif_importdata task. ‘’: use all MeasurementSets in the context

Examples: ‘ngc5921.ms’, [‘ngc5921a.ms’, ngc5921b.ms’, ‘ngc5921c.ms’]

caltable The list of output calibration tables. Defaults to the

standard pipeline naming convention.

Example: caltable=[‘M82.gcal’, ‘M82B.gcal’]

field The list of field names or field ids for which bandpasses are

computed. Defaults to all fields.

Examples: field=’3C279’, field=’3C279, M82’

intent A string containing a comma delimited list of intents against

which the selected fields are matched. Defaults to all data with bandpass intent.

Example: intent=’PHASE’

spw The list of spectral windows and channels for which bandpasses

are computed. Defaults to all science spectral windows.

Example: spw=’11,13,15,17’

antenna Set of data selection antenna IDs phaseup Do a phaseup on the data before computing the bandpass

solution.

phaseupsolint The phase correction solution interval in CASA syntax.

Used when phaseup is True.

Example: phaseupsolint=300

phaseupbw Bandwidth to be used for phaseup. Defaults to 500MHz.

Used when phaseup is True.

Examples: phaseupbw=’’ to use entire bandpass

phaseupbw=’500MHz’ to use central 500MHz

solint Time and channel solution intervals in CASA syntax.

Examples: solint=’inf,10ch’, ‘inf’

combine Data axes to combine for solving. Axes are ‘’, ‘scan’, ‘spw’,

‘field’ or any comma-separated combination.

Example: combine=’scan,field’

refant Reference antenna names. Defaults to the value(s) stored in

the pipeline context. If undefined in the pipeline context defaults to the CASA reference antenna naming scheme.

Examples: refant=’DV01’, refant=’DV06,DV07’

solnorm Normalise the bandpass solution minblperant Minimum number of baselines required per antenna for each

solve. Antennas with fewer baselines are excluded from solutions.

minsnr Reject solutions below this SNR pipelinemode The pipeline operating mode.

In ‘automatic’ mode the pipeline determines the values of all context defined pipeline inputs automatically. In ‘interactive’ mode the user can set the pipeline context defined parameters manually. In ‘getinputs’ mode the user can check the settings of all pipeline parameters without running the task.

dryrun Run the task (False) or just display the command (True) acceptresults Add the results of the task to the pipeline context (True) or

reject them (False).

——— examples ———————————————————–

1. Compute a channel bandpass for all visibility files in the pipeline context using the CASA reference antenna determination scheme:

hif_bandpass()

  1. Same as the above but precompute a prioritized reference antenna list:

hif_refant() hif_bandpass()