[daip] Fring -solsub problem:
Craig Walker
cwalker at aoc.nrao.edu
Mon Apr 26 14:07:51 EDT 2004
I am having a problem where FRING seems to be getting perfectly fine
solutions as far as the screen output is concerned, but nothing is
being written to the SN table for some, but not all, of the data.
For the following, antenna 5 gives good solutions to the SN table,
as do all excluded antennas in a previous unconstrained run. The
other included antennas appear to give good solutions, but they do
not appear in the SN table.
I reran exactly the same inputs but with solsub=1 solint=2 and
antennas = 1,4,7,8. This time the data all ended up in the SN
table. Something very similar happened to me with CygnusA. So
there is something about the use of SOLSUB that can cause some valid
solutions to never find their way to the SN table.
I can provide the data set if necessary.
AIPS 1: FRING: Task to fringe fit data
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: Input uv data.
AIPS 1: INNAME 'BW067D ' UV file name (name)
AIPS 1: INCLASS 'UVDATA' UV file name (class)
AIPS 1: INSEQ 1 UV file name (seq. #)
AIPS 1: INDISK 2 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 0 5 Time range to use.
AIPS 1: 0 0 0 5
AIPS 1: 23 0
AIPS 1: BCHAN 1 Lowest channel number 0=>all
AIPS 1: ECHAN 0 Highest channel number
AIPS 1: ANTENNAS 1 4 Antennas to select. 0=all
AIPS 1: 5 7 8 *rest 0
AIPS 1: DOFIT *all 0 Subset of ANTENNAS list
AIPS 1: for which solns are desired.
AIPS 1: 0 => all in ANTENNAS
AIPS 1: < 0 => all not in DOFIT list
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:
AIPS 1: Cal. info for input:
AIPS 1: DOCALIB 2 If >0 calibrate data
AIPS 1: = 2 calibrate weights
AIPS 1: GAINUSE 3 CL table to apply.
AIPS 1: DOPOL -1 If >0 correct polarization.
AIPS 1: BLVER -1 BL table to apply.
AIPS 1: FLAGVER 2 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 (optional)
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: 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 1 UV file disk drive #
AIPS 1:
AIPS 1: Solution control adverbs:
AIPS 1: REFANT 8 Reference antenna
AIPS 1: SEARCH *all 0 Prioritized reference antenna
AIPS 1: list - supplements REFANT
AIPS 1: - but only if APARM(9)>0
AIPS 1: SOLINT 3 Solution interval (min)
AIPS 1: 0 => 10 min
AIPS 1: SOLSUB 3 Solution subinterval
AIPS 1: SOLMIN 1 Min solution interval
AIPS 1:
AIPS 1: APARM 2 0 General parameters
AIPS 1: 0 0 1=min. no. antennas
AIPS 1: 0 2 2 > 0 => data divided
AIPS 1: 4 0 3 > 0 => avg. RR,LL
AIPS 1: 1 0 4 > 0 => avg. freq. in IFs
AIPS 1: 5 > 0 => combine IFs.
AIPS 1: 6=print level, 1=some
AIPS 1: 7=SNR cutoff (0=>5)
AIPS 1: 8=max. ant. # (no AN)
AIPS 1: 9 > 0 => do exhaustive
AIPS 1: baseline search
AIPS 1: DPARM 2 200 Delay-rate parameters
AIPS 1: 100 2.0972 1=no. bl combo. (def=3)
AIPS 1: *rest 0 2=delay win (nsec), if <0
AIPS 1: no delay search done
AIPS 1: 3=rate win (mHz)
AIPS 1: 4=int. time (sec)
AIPS 1: 0 => min. found in data
AIPS 1: 5 >0 => don't do ls. soln
AIPS 1: 6 >0 => don't avg. in freq
AIPS 1: 7 >0 => don't rereference
AIPS 1: phase
AIPS 1: 8 > 0 => activate zero'ing
AIPS 1: options
AIPS 1: SNVER 0 Output SN table, 0=>new table
AIPS 1: ANTWT *all 0 Ant. weights (0=>1.0)
AIPS 1: BADDISK *all 0 Disk no. not to use for
AIPS 1: scratch files.
The above all happened at home. I copied the main data set to eolus and
stripped it down to the antennas and times (to 05:35) with the trouble.
I checked and the problem does occur with this test data set. It is on
eolus disk 2 user 450
AIPS 1: 43 2263 BW067D FTST .UVDATA. 1 UV 26-APR-2004 12:02:41
I made SN 6 with a fring like the above.
Cheers
Craig
---------------------------------------------------------------------
R. Craig Walker Array Operations Center
cwalker at nrao.edu National Radio Astronomy Observatory
Phone 505 835 7247 P. O. Box O
Fax 505 835 7027 Socorro NM 87801 USA
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