[daip] aips polarization cal
Eric Greisen
egreisen at nrao.edu
Mon Nov 7 18:11:49 EST 2011
bob at physics.ucdavis.edu wrote:
>> bob at physics.ucdavis.edu wrote:
>>>> bob at physics.ucdavis.edu wrote:
>>>>> hello again. i am running pcal with multiple calsources.
>>>>> not surprisingly, the solutions on some days are better than others.
>>>>> if i want to move a solution from one day to another,
>>>>> does copying the an file suffice?
>>>>>
>>>>> do you advise against this? i have been told that the solutions
>>>>> are very stable.
>>>>>
>>>>> bob becker
>>>> If you are doing continuum move the AN tables
>>>> If you are doing line move the PD tables
>>>>
>>>> Eric
>>>>
>>> i am still not happy with my polarization calibration based on
>>> using j0318+1628, 0521+166 and 0137+331 as inputs to pcal. my original
>>> plan was to use 3c84 to get the D terms. If you recall, i was not
>>> able to get pcal to work using just 3c84 but i would like to try
>>> again. do remember that discussion and do you have any new suggestions
>>> to make pcal work with just 3c84 as an input?
>>>
>>> thanks as always
>>>
>>> bob becker
>> I made a change to PCAL that worked well with 3C84 as a single several
>> minute scan. I broke up the scan with SOLINT and got excellent
>> solutions. The task (if you run MNJ on 31DEC11) will now automatically
>> break up a single scan into 3 parts.
>>
>> It should be better now...
>>
>> Eric
>>
> that is encouraging. can you give me all the inputs you used for pcal
> that resulted in a successful run?
>
> bob
AIPS 1: INNAME 'PCAL 1 scan' Input UV file name (name)
AIPS 1: INCLASS 'UVCOP' Input UV file name (class)
AIPS 1: INSEQ 1 Input UV file name (seq. #)
AIPS 1: INDISK 6 Input UV file disk unit #
AIPS 1: Data selection (multisource):
AIPS 1: CALSOUR 'J0319+4130' Sources to calibrate with
AIPS 1: *rest ' '
AIPS 1: QUAL -1 Calibrator qualifier -1=>all
AIPS 1: CALCODE ' ' Calibrator code ' '=>all
AIPS 1: TIMERANG *all 0 Time range to use.
AIPS 1: SELBAND -1 Bandwidth to select (kHz)
AIPS 1: SELFREQ -1 Frequency to select (MHz)
AIPS 1: FREQID 0 Freq. ID to select.
AIPS 1: BIF 0 Lowest IF number 0=>all
AIPS 1: EIF 0 Highest IF number 0=>all
AIPS 1: ANTENNAS *all 0 Antennas to solve for.
AIPS 1: UVRANGE 0 0 UV range in kilolamdba
AIPS 1: SUBARRAY 0 Subarray, 0=>all
AIPS 1: Cal. info for input:
AIPS 1: DOCALIB 1 > 0 calibrate data & weights
AIPS 1: > 99 do NOT calibrate weights
AIPS 1: GAINUSE 0 CAL table to apply.
AIPS 1: CLEAN map (optional)
AIPS 1: BLVER -1 BL table to apply.
AIPS 1: FLAGVER 0 Flag table version
AIPS 1: DOBAND 1 If >0 apply bandpass cal.
AIPS 1: Method used depends on value
AIPS 1: of DOBAND (see HELP file).
AIPS 1: BPVER 1 Bandpass table version
AIPS 1: SMOOTH *all 0 Smoothing function. See
AIPS 1: HELP SMOOTH for details.
AIPS 1: ICHANSEL 5 60 Array of start and stop chan
AIPS 1: 1 *rest 0 numbers, plus a channel
AIPS 1: increment and IF to be used
AIPS 1: to select channels to sum to
AIPS 1: find the polarization.
AIPS 1: 0 => all channels
AIPS 1: IN2NAME ' ' Cleaned map name (name)
AIPS 1: IN2CLASS ' ' Cleaned map name (class)
AIPS 1: IN2SEQ 0 Cleaned map name (seq. #)
AIPS 1: IN2DISK 0 Cleaned map disk unit #
AIPS 1: INVERS 0 CC file version #.
AIPS 1: NCOMP *all 0 # comps to use for model.
AIPS 1: 1 value per field
AIPS 1: FLUX 0 Lowest CC component used.
AIPS 1: NMAPS 0 No. Clean map files
AIPS 1: CMETHOD ' ' Modeling method:
AIPS 1: 'DFT','GRID',' '
AIPS 1: CMODEL ' ' Model type: 'COMP','IMAG'
AIPS 1: 'SUBI' (see HELP re images)
AIPS 1: DOMODEL 1 > 0 => use model, do not
AIPS 1: fit source Q and U
AIPS 1: = 2 use CP table model
AIPS 1: PMODEL *all 0 Source poln. model
AIPS 1: SPECPARM *all 0 Spectral index: I Q U V for
AIPS 1: each CALSOUR
AIPS 1: SOLINT 0.4 Soln. interval (min) 0=>5.
AIPS 1: SOLTYPE ' ' Solution type:
AIPS 1: 'ORI-', 'APPR', 'RAPR'
AIPS 1: SPECTRAL 1 > 0 do spectral PCAL
AIPS 1: <= 0 do continuum PCAL
AIPS 1: INTPARM *all 0 Smoothing parameters for
AIPS 1: spectral mode
AIPS 1: PRTLEV 1 Print statistics 0=>none
AIPS 1: 1 = some, 2 = lots. Use 1.
AIPS 1: REFANT 24 Reference antenna, 0->pick
AIPS 1: BPARM *all 0 Task enrichment parameters
AIPS 1: for SOLTYPE 'ORI-' only:
AIPS 1: (1) if > 0 use default
AIPS 1: initial feed parameters.
AIPS 1: (2) > 0 -> no error calc.
AIPS 1: (3) if > 0 then fit for R-L
AIPS 1: phase difference
AIPS 1: (4) initial R-L phase
AIPS 1: (5) >0 solve for Vpol.
AIPS 1: (6) >0 fix ref. ori. 1
AIPS 1: (7) >0 fix ref. ori. 2
AIPS 1: (8) >0 fix all orientations
AIPS 1: (9) >0 fix all ellipticities
AIPS 1: (10) >0 fix source poln.
AIPS 1: CPARM *all 0 Task enrichment parameters
AIPS 1: (1) >0 => average in IF
AIPS 1: and find common solution.
AIPS 1: (2) >0 => update source
AIPS 1: table with pol. solution
AIPS 1: (3) >0 => do NOT interpolate
AIPS 1: over flagged channels
AIPS 1: (4) CP table version if
AIPS 1: DOMODEL = 2
AIPS 1: (8) >0 => max. no. iter
AIPS 1: (9) >0 => conv. tolerance
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: (10) >0 => conv. tol.
AIPS 1: BADDISK *all 0 Disk no. not to use for
AIPS 1: scratch files.
Nothing hard about it - note that solint can be zero and the task will
set it or one can try break the single scan up in small pieces.
Eric Greisen
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