[daip] CALIB
Crystal Brogan
cbrogan at nrao.edu
Mon Jul 14 19:32:51 EDT 2008
Hi,
Something seems to be wrong with CALIB in the case of self-calibration and
multiple subarrays.
Attached is a UV dataset with three AN files corresponding to three days
of SMA data. This file is the result of a previous phase only self-cal
with a 1-minute solution interval, and now I am attempting a longer
phase& self-cal.
Also attached is the model image.
When I try to do solmode='a&p' using this combination, and the most recent
version of 31DEC08, I get very odd results. If the solution interval is
shorter than 4.5 minutes, subarray 1 is ok, but many (unreasonably) failed
in subarrays 2 & 3 - they are definitely NOT failing to S/N. If I increase
to 5 minutes, it refuses to find any solutions for subarrays 2 & 3 saying:
CALIB1: ERROR: NO VALID SOLUTIONS FOUND
CALIB1: Destroyed UV image file: catno= 27 disk= 9
I calibrated this same data a few months ago with no problems (I started
over to make a small tweak to overall flux scale).
Something very odd is going on. An example of my inputs is below.
Please let me know if you have any suggestions.
thanks,
crystal
AIPS 1: CALIB: Task to determine calibration for data.
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: Input uv data.
AIPS 1: INNAME 'N6334IN_217C' UV file name (name)
AIPS 1: INCLASS 'CALIB' UV file name (class)
AIPS 1: INSEQ 7 UV file name (seq. #)
AIPS 1: INDISK 9 UV file disk drive #
AIPS 1: Data selection (multisource):
AIPS 1: CALSOUR *all ' ' Calibrator sources
AIPS 1: QUAL -1 Calibrator qualifier -1=>all
AIPS 1: CALCODE ' ' Calibrator code ' '=>all
AIPS 1: SELBAND -1 Bandwidth to select (kHz)
AIPS 1: SELFREQ -1 Frequency to select (MHz)
AIPS 1: FREQID 1 Freq. ID to select.
AIPS 1: TIMERANG *all 0 Time range to use.
AIPS 1: BCHAN 1 Lowest channel number 0=>all
AIPS 1: ECHAN 0 Highest channel number
AIPS 1: ANTENNAS *all 0 Antennas to select. 0=all
AIPS 1: DOFIT *all 0 Subset of ANTENNAS list for
AIPS 1: which solns are desired.
AIPS 1: ANTUSE *all 0 Mean gain is calculated
AIPS 1: (CPARM(2)>0) using only the
AIPS 1: listed antennas. See explain.
AIPS 1: SUBARRAY 0 Subarray, 0=>all
AIPS 1: UVRANGE 0 0 Range of uv distance for full
AIPS 1: weight
AIPS 1: WTUV 0 Weight outside UVRANGE 0=0.
AIPS 1: WEIGHTIT 0 Modify data weights function
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 CL table to apply.
AIPS 1: DOPOL -1 If >0 correct polarization.
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:
AIPS 1: CLEAN map. See HELP.
AIPS 1: IN2NAME 'N6334IN_217C' Cleaned map name (name)
AIPS 1: IN2CLASS 'ICL001' Cleaned map name (class)
AIPS 1: IN2SEQ 10 Cleaned map name (seq. #)
AIPS 1: IN2DISK 9 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 'DFT' Modeling method:
AIPS 1: 'DFT','GRID',' '
AIPS 1: CMODEL ' ' Model type: 'COMP','IMAG'
AIPS 1: SMODEL *all 0 Source model, 1=flux,2=x,3=y
AIPS 1: See HELP SMODEL for models.
AIPS 1:
AIPS 1: Output uv data file.
AIPS 1: OUTNAME ' ' UV file name (name)
AIPS 1: OUTCLASS ' ' UV file name (class)
AIPS 1: OUTSEQ 0 UV file name (seq. #)
AIPS 1: OUTDISK 9 UV file disk drive #
AIPS 1:
AIPS 1: Solution control adverbs:
AIPS 1: REFANT 6 Reference antenna
AIPS 1: SOLINT 5 Solution interval (min)
AIPS 1: SOLSUB 0 Solution subinterval
AIPS 1: SOLMIN 0 Min solution interval
AIPS 1: APARM *all 0 General parameters
AIPS 1: 1=min. no. antennas
AIPS 1: 2 > 0 => data divided
AIPS 1: 3 > 0 => avg. RR,LL
AIPS 1: 5 > 0 => avg. IFs.
AIPS 1: 6=print level, 1=good,
AIPS 1: 2 closure, 3 SNR
AIPS 1: 7=SNR cutoff (0=>5)
AIPS 1: 8=max. ant. # (no AN)
AIPS 1: 9 > 0 => pass failed soln
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: 10 < 99 cal output weights
AIPS 1: Phase-amplitude Parameters:
AIPS 1: DOFLAG 0 Flag on closure error?
AIPS 1: SOLTYPE ' ' Soln type,' ','L1','GCON',
AIPS 1: 'R', 'L1R', 'GCOR'
AIPS 1: SOLMODE 'A&P' Soln. mode: 'A&P','P','P!A',
AIPS 1: 'GCON',
AIPS 1: SOLCON 0 Gain constraint factor.
AIPS 1: MINAMPER 0 Amplitude closure error
AIPS 1: regarded as excessive in %
AIPS 1: MINPHSER 0 Phase closure error regarded
AIPS 1: as excessive in degrees
AIPS 1: CPARM *all 0 Phase-amp. parameters
AIPS 1: 1 = Min el for gain
AIPS 1: normalization (deg)
AIPS 1: 2 >0 => normalize gain
AIPS 1: 3 avg. amp. closure err
AIPS 1: 4 avg. ph. closure err
AIPS 1: 5 >0 => scalar average
AIPS 1: 6 limit clipping in robust
AIPS 1: 7 limit display of closure
AIPS 1: errors
AIPS 1: SNVER 0 Output SN table, 0=>new table
AIPS 1: ANTWT *all 0 Ant. weights (0=>1.0)
AIPS 1: GAINERR *all 0 Std. Dev. of antenna gains.
AIPS 1: BADDISK *all 0 Disk no. not to use for
AIPS 1: scratch files.
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