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| == Help on blcal task: ==
| | {{blcal}} |
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| <pre>
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| Calculate a baseline-based calibration solution (gain or bandpass)
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| This task determines a baseline by baseline gain (time) or bandpass (freq)
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| for all baseline pairs in the data set. For the usual antenna-based calibration
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| of interferometric data, this task gaincal is recommended, even with only one
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| to three baselines. For arrays with closure errors, use blcal
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| Keyword arguments:
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| vis -- Name of input visibility file
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| default: none; example: vis='ngc5921.ms'
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| caltable -- Name of output Gain calibration table
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| default: none; example: caltable='ngc5921.gcal'
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| --- Data Selection (see help par.selectdata for more detailed information)
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| field -- Select field using field id(s) or field name(s).
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| [run listobs to obtain the list id's or names]
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| default: ''=all fields
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| If field string is a non-negative integer, it is assumed a field index
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| otherwise, it is assumed a field name
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| field='0~2'; field ids 0,1,2
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| field='0,4,5~7'; field ids 0,4,5,6,7
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| field='3C286,3C295'; field named 3C286 adn 3C295
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| field = '3,4C*'; field id 3, all names starting with 4C
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| spw -- Select spectral window/channels
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| default: ''=all spectral windows and channels
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| spw='0~2,4'; spectral windows 0,1,2,4 (all channels)
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| spw='<2'; spectral windows less than 2 (i.e. 0,1)
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| spw='0:5~61'; spw 0, channels 5 to 61
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| spw='0,10,3:3~45'; spw 0,10 all channels, spw 3, channels 3 to 45.
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| spw='0~2:2~6'; spw 0,1,2 with channels 2 through 6 in each.
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| spw='0:0~10;15~60'; spectral window 0 with channels 0-10,15-60
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| spw='0:0~10,1:20~30,2:1;2;3'; spw 0, channels 0-10,
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| spw 1, channels 20-30, and spw 2, channels, 1,2 and 3
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| selectdata -- Other data selection parameters
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| default: True
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| timerange -- Select data based on time range:
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| default = '' (all); examples,
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| timerange = 'YYYY/MM/DD/hh:mm:ss~YYYY/MM/DD/hh:mm:ss'
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| Note: if YYYY/MM/DD is missing dat defaults to first day in data set
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| timerange='09:14:0~09:54:0' picks 40 min on first day
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| timerange= '25:00:00~27:30:00' picks 1 hr to 3 hr 30min on next day
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| timerange='09:44:00' data within one integration of time
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| timerange='>10:24:00' data after this time
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| uvrange -- Select data within uvrange (default units kilo-lambda)
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| default: '' (all); example:
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| uvrange='0~1000kl'; uvrange from 0-1000 kilo-lamgda
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| uvrange='>4kl';uvranges greater than 4 kilo lambda
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| uvrange='0~1000km'; uvrange in kilometers
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| antenna -- Select data based on antenna/baseline
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| default: '' (all)
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| If antenna string is a non-negative integer, it is assumed an antenna index
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| otherwise, it is assumed as an antenna name
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| antenna='5&6'; baseline between antenna index 5 and index 6.
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| antenna='VA05&VA06'; baseline between VLA antenna 5 and 6.
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| antenna='5&6;7&8'; baseline 5-6 and 7-8
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| antenna='5'; all baselines with antenna 5
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| antenna='5,6,10'; all baselines with antennas 5 and 6
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| scan -- Scan number range - New, under developement
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| msselect -- Optional complex data selection (ignore for now)
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| solint -- Solution interval (units optional)
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| default: 'inf' (~infinite, up to boundaries controlled by combine);
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| Options: 'inf' (~infinite), 'int' (per integration), any float
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| or integer value with or without units
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| examples: solint='1m'; solint='60s', solint=60 --> 1 minute
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| solint='0s'; solint=0; solint='int' --> per integration
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| solint-'-1s'; solint='inf' --> ~infinite, up to boundaries
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| enforced by combine
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| combine -- Data axes to combine for solving
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| default: 'scan' --> solutions will break at field and spw boundaries,
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| but may extend over multiple scans (per field and spw) up
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| to solint.
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| Options: '','scan','spw',field', or any comma-separated combination
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| example: combine='scan,spw' --> extend solutions over scan boundaries
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| (up to the solint), and combine spws for solving
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| freqdep -- Solve for frequency dependent solutions
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| default: False (gain; True=bandpass); example: freqdep=True
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| calmode -- Type of solution
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| default: 'ap' (amp and phase); example: calmode='p'
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| Options: 'p','a','ap'
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| solnorm -- Normalize solutions. For freqdep=F, this is a global (per-spw)
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| normalization of amplitudes (only). For freqdep=T, each baseline
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| solution spectrum is separately normalized by its (complex) mean.
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| default: False (no normalization)
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| gaintable -- Gain calibration table(s) to apply
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| default: '' (none);
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| examples: gaintable='ngc5921.gcal'
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| gaintable=['ngc5921.ampcal','ngc5921.phcal']
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| gainfield -- Select a subset of calibrators from gaintable(s)
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| default:'' ==> all sources in table;
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| same syntax as field
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| example: gainfield='0~3'
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| but may extend over multiple scans (per field and spw) up
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| to solint.
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| Options: '','scan','spw',field', or any comma-separated combination
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| example: combine='scan,spw' --> extend solutions over scan boundaries
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| (up to the solint), and combine spws for solving
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| freqdep -- Solve for frequency dependent solutions
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| default: False (gain; True=bandpass); example: freqdep=True
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| calmode -- Type of solution
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| default: 'ap' (amp and phase); example: calmode='p'
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| Options: 'p','a','ap'
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| solnorm -- Normalize solutions. For freqdep=F, this is a global (per-spw)
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| normalization of amplitudes (only). For freqdep=T, each baseline
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| solution spectrum is separately normalized by its (complex) mean.
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| default: False (no normalization)
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| gaintable -- Gain calibration table(s) to apply
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| default: '' (none);
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| examples: gaintable='ngc5921.gcal'
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| gaintable=['ngc5921.ampcal','ngc5921.phcal']
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| gainfield -- Select a subset of calibrators from gaintable(s)
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| default:'' ==> all sources in table;
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| same syntax as field
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| example: gainfield='0~3'
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| gainfield=['0~3','4~6']
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| interp -- Interpolation mode (in time) to use for each gaintable
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| default: '' --> 'linear' for all gaintable(s)
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| example: interp='nearest'
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| interp=['nearest','linear']
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| Options: 'nearest', 'linear', 'aipslin'
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| spwmap -- Spectral windows combinations to form for gaintable(s)
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| default: [] (apply solutions from each spw to that spw only)
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| Example: spwmap=[0,0,1,1] means apply the caltable solutions
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| from spw = 0 to the spw 0,1 and spw 1 to spw 2,3.
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| spwmap=[[0,0,1,1],[0,1,0,1]]
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| gaincurve -- Apply internal VLA antenna gain curve correction (True/False)
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| default: False;
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| Use gaincurve=True ONLY for VLA data
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| opacity -- Opacity correction to apply (nepers)
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| default: 0.0 (no opacity correction)
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| example: opacity=0.051
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| Typical VLA values are: 5 GHz - 0.013, 8 GHz - 0.013
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| 15 GHz - 0.016, 23 GHz - 0.051, 43 GHz - 0.07
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| parang -- If True, apply the parallactic angle correction (required
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| for polarization calibration)
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| default: False
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| </pre>
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