[daip] [!9732]: AIPS - R-L delay calibration: rldly & crsfring
Yuri Kovalev
nraohelp at nrao.edu
Sun Jan 29 10:17:45 EST 2017
Yuri Kovalev updated #9732
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R-L delay calibration: rldly & crsfring
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Ticket ID: 9732
URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/9732
Full Name: Yuri Kovalev
Email: yyk at asc.rssi.ru
Creator: User
Department: AIPS Data Reduction
Staff (Owner): -- Unassigned --
Type: Issue
Status: Open
Priority: Default
SLA: NRAO E2E
Template Group: Default
Created: 29 January 2017 03:17 PM
Updated: 29 January 2017 03:17 PM
Due: 01 February 2017 12:00 AM (2d 8h 43m)
Resolution Due: 07 February 2017 12:00 AM (8d 8h 43m)
Dear colleagues,
There are two ways to calibrate the R-L delay in AIPS: rldly & crsfring.
It seems that both of them stopped working, at least for Matt Lister and myself reducing MOJAVE 2 cm VLBA data.
The story is as follows:
rldly does not result in proper outcome already for a very long time. This means, at least within 31DEC15 and 31DEC16 version.
See the most recent example (BL229AD, 31DEC16 AIPS) here but we stopped using it more than a year ago, I think, even under 31DEC15:
ftp://jet.asc.rssi.ru/outgoing/yyk/2cm/BL229AD_RLDLY/POSSM_CROSS_RLDLY.PS
The calibration was done for BL229AD with the following parameters:
AIPS 1: RLDLY: Task to fringe fit data for R-L delay difference
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: Input uv data.
AIPS 1: INNAME 'BL229AD' UV file name (name)
AIPS 1: INCLASS 'UVDATA' UV file name (class)
AIPS 1: INSEQ 1 UV file name (seq. #)
AIPS 1: INDISK 1 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 16 Time range to use.
AIPS 1: 50 47 IMPORTANT, NO DEFAULT
AIPS 1: 0 16 57 40
AIPS 1: BCHAN 1 Lowest channel number 0=>all
AIPS 1: ECHAN 0 Highest channel number
AIPS 1: CHINC 1 Spectral channel increment
AIPS 1: (data are averaged)
AIPS 1: ANTENNAS *all 0 Antennas to select. 0=all
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:
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
AIPS 1: Cal. info for input:
AIPS 1: DOCALIB 2 > 0 calibrate data & weights
AIPS 1: > 99 do NOT calibrate weights
AIPS 1: GAINUSE 6 CL table to apply.
AIPS 1: DOPOL -1 If >0 correct polarization.
AIPS 1: PDVER 0 PD table to apply (DOPOL>0)
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: Solution control adverbs:
AIPS 1: REFANT 2 Reference antenna 0 -> all
AIPS 1: SOLINT 0 Data integration time (sec)
AIPS 1: 0 => found in data
AIPS 1: DOIFS 0 0 => solve all IFs separately
AIPS 1: 1 => 1 solution for all IFs
AIPS 1: 2 => 2 solutions, 1 each for
AIPS 1: IFs by halves
AIPS 1: 3 => 3 solutions, 1 each for
AIPS 1: IFs by thirds
AIPS 1: 4 => 4 solutions, 1 each for
AIPS 1: IFs by quarters
AIPS 1: etc. SEE HELP WARNING
AIPS 1: BIF 1 First IF included when
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
AIPS 1: DOIFS > 0
AIPS 1: EIF 0 Last IF included when DOIFS>0
AIPS 1: APARM 2 *rest 0 (1) Minimum SNR to include in
AIPS 1: solution average 0 -> 5
AIPS 1: (2) > 0 -> do NOT write CL
AIPS 1: table even when 1 scan
AIPS 1: SN table always written
AIPS 1: (3) max allowed error in
AIPS 1: delay in ns. 0 -> 1.E6
AIPS 1: PRTLEV 0 > 0 => diagnostic outputs
AIPS 1: BADDISK *all 0 Disk no. not to use for
AIPS 1: scratch files.
crsfring was working fine for me under 31DEC15 but Matt Lister reported issues recently and I also did not manage to get it working as soon as I upgraded to 31DEC16:
LOCALH> BLAVG1: Task BLAVG (release of 31DEC16) begins
LOCALH> BLAVG1: OUTPUT BASELINE 1 - 2
LOCALH> BLAVG1: Create CROSSPOL TMP.BLAVG . 666 (UV) on disk 1 cno 2
LOCALH> BLAVG1: UVGET: Using flag table version 1 to edit data
LOCALH> BLAVG1: BLAVDO: NO. OF PARAMETERS 12 NOT NORMAL - AVG MAY BE BAD
LOCALH> BLAVG1: BLAVDO: 4 Visibility records written
LOCALH> BLAVG1: Copied WX file from vol/cno/vers 1 1 1 to 1 2 1
LOCALH> BLAVG1: Copied FQ file from vol/cno/vers 1 1 1 to 1 2 1
LOCALH> BLAVG1: Copied AN file from vol/cno/vers 1 1 1 to 1 2 1
LOCALH> BLAVG1: Copied SU file from vol/cno/vers 1 1 1 to 1 2 1
LOCALH> BLAVG1: Appears to have ended successfully
LOCALH> BLAVG1: localhos 31DEC16 TST: Cpu= 9.3 Real= 104 IO= 290
LOCALH> INDXR1: Task INDXR (release of 31DEC16) begins
LOCALH> INDXR1: Appears to have ended successfully
LOCALH> INDXR1: localhost 31DEC16 TST: Cpu= 0.0 Real= 0
LOCALH> FRING1: Task FRING (release of 31DEC16) begins
LOCALH> FRING1: UVGET: doing no flagging this time
LOCALH> FRING1: Selecting the data
LOCALH> FRING1: No need to divide by flux densities in this task
LOCALH> FRING1: Determining solutions
LOCALH> FRING1: Writing SN table 1
LOCALH> FRING1: BAD BASELINE CODE= 1- 0 NO. ANT.= 10
LOCALH> FRING1: BAD BASELINE CODE= 1- 0 NO. ANT.= 10
LOCALH> FRING1: BAD BASELINE CODE= 1- 0 NO. ANT.= 10
LOCALH> FRING1: BAD BASELINE CODE= 1- 0 NO. ANT.= 10
LOCALH> FRING1: Time= 0/ 08 25 44, Polarization = 1
LOCALH> FRING1: QINIT: did a GET of 5120 Kwords, OFF 17455403342597
LOCALH> FRING1: Time= 0/ 08 25 44, Polarization = 2
LOCALH> FRING1: ERROR: NO VALID SOLUTIONS FOUND
Here are crsfring parameters (I tried for two different calibrator scans):
AIPS 1: CRSFRING: Procedure to calibrate cross pol. delays
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: Use RUN CRSFRING first
AIPS 1: INNAME 'BL229AD' UV file name (name)
AIPS 1: INCLASS 'UVDATA' UV file name (class)
AIPS 1: INSEQ 1 UV file name (seq. #)
AIPS 1: INDISK 1 UV file disk drive #
AIPS 1: OUTDISK 1 Disk for temporary files
AIPS 1: FLAGVER 1 Flag table to use
AIPS 1: GAINUSE 6 Calibration table to use
AIPS 1: NO DEFAULT
AIPS 1: SUBARRAY 0 Selected subarray
AIPS 1: ANTENNAS *all 0 List of antennas, 0->use all
AIPS 1: REFANT 2 Reference antenna
AIPS 1: CALSOUR *all ' ' Calibrator sources to use.
AIPS 1: See note in HELP file!
AIPS 1: TIMERANG 0 18 Time range
AIPS 1: 23 27 0 18
AIPS 1: 30 21
AIPS 1: SOLINT 2 Pre-averaging interval (min)
AIPS 1: BADDISK *all 0 Disk drive #'s to avoid
In the same time, if I load 31DEC15 AIPS version, the same crsfring parameters result in (i) working crsfring, (ii) an acceptable R-L delay calibration output:
ftp://jet.asc.rssi.ru/outgoing/yyk/2cm/BL229AD_31DEC15_CRSFRING/POSSM_CROSS_CRSFRING_31DEC15.PS
Any comments?
Cheers,
Yuri
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