[daip] Problem with UVFIX
Eric Greisen
egreisen at nrao.edu
Thu Nov 8 13:46:00 EST 2007
dbgob at brandeis.edu writes:
> Showing ignorance, how would I know if it is VLBA like? The original
> file looks like VLA data and when I run PRTAN I get a VLA pattern like
> I normally would. Beyond this what should I look for?
That is good enough - the BX, By, Bz are a few 1000's of m and so
are VLA not earth size.
>
> This error is for more than this data source. I cam across another on
> the other day.
UVFIX is run all the time and the problems you report do not
occur but UVFIX does not have enough parameters for you to make a
mistake either.
>
> My new fun problem just now is also with the AN table from a
> observation on 8/13/83 where all antennas are out, but data was taken.
> Somehow I can manipulate this data pre UVFIX, and I can also find
> solutions using calib, but I cannot display the data after UVFIX using
> UVPLT. I get scale errors. UVFIX is somehow using the bad AN file
> information and corrupting the data with it. Thoughts?
Are they out and show 0 for the coordinates?
I will try to locate these data from the archive and try UVFIX
myself.
Eric Greisen
>
> ~Doug
>
>
> > go prtan
> PRTAN1: Task PRTAN (release of 31DEC07) begins
> galaxy PRTAN(31DEC07) 3666 08-NOV-2007 13:33:57 Page 1
> File=19890123 .X BAND. 1 An.ver= 1 Vol= 1 User= 3666
> Array= VLA Freq= 8414.900000 MHz Ref.date= 23-JAN-1989
>
> Array reference position in meters (Earth centered)
> Array BX= -1601185.36500 BY= -5041977.54700 BZ= 3554875.87000
> Polar X = 0.00000 Polar Y = 0.00000 arcsec
> Earth rotation rate = 360.9856449729 degrees / IAT day
> GST at UT=0 = 122.3062868243 degrees
> UT1-UTC= 0.0000000 Data time(IAT )-UTC= 0.0000000 seconds
> Solutions not yet determined for a particular FREQID
>
> Ant 1 = VLA:_W48 BX= 3275.1448 BY= -8682.4850 BZ= -4854.8510
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 2 = VLA:_N72 BX= -10577.4709 BY= -1651.4341 BZ= 15618.8268
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 3 = VLA:_N24 BX= -1660.4986 BY= -259.4043 BZ= 2454.4275
> Mount=ALAZ Axis offset= -0.0033 meters IFA IFB
> Feed polarization type = R L
>
> Ant 4 = VLA:_W24 BX= 1005.4337 BY= -2642.9971 BZ= -1472.1934
> Mount=ALAZ Axis offset= 0.0078 meters IFA IFB
> Feed polarization type = R L
>
> Ant 5 = VLA:_N8 BX= -243.6082 BY= -38.0379 BZ= 360.0547
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 6 = VLA:_N48 BX= -5271.3100 BY= -823.5495 BZ= 7791.9733
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 7 = VLA:_E72 BX= 4857.9207 BY= 19090.2761 BZ= -7275.8913
> Mount=ALAZ Axis offset= -0.0036 meters IFA IFB
> Feed polarization type = R L
> Type Q to stop, just hit RETURN to continue
>
> galaxy PRTAN(31DEC07) 3666 08-NOV-2007 13:34:13 Page 2
> File=19890123 .X BAND. 1 An.ver= 1 Vol= 1 User= 3666
> Array= VLA Freq= 8414.900000 MHz Ref.date= 23-JAN-1989
>
> Ant 8 = VLA:_N64 BX= -8642.1437 BY= -1349.2398 BZ= 12760.7074
> Mount=ALAZ Axis offset= 0.0084 meters IFA IFB
> Feed polarization type = R L
>
> Ant 9 = VLA:_W8 BX= 152.7597 BY= -401.2722 BZ= -223.4035
> Mount=ALAZ Axis offset= -0.0177 meters IFA IFB
> Feed polarization type = R L
>
> Ant 10 = VLA:_W72 BX= 6536.2723 BY= -17410.2207 BZ= -9755.4677
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 11 = VLA:_W64 BX= 5349.1512 BY= -14224.3521 BZ= -7964.4484
> Mount=ALAZ Axis offset= 0.0048 meters IFA IFB
> Feed polarization type = R L
>
> Ant 12 = VLA:_W56 BX= 4258.9919 BY= -11311.5142 BZ= -6329.9779
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 13 = VLA:_N16 BX= -801.3991 BY= -124.9723 BZ= 1182.1133
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 14 = VLA:_E64 BX= 4083.2592 BY= 15550.4506 BZ= -5990.5016
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 15 = VLA:_N56 BX= -6870.9392 BY= -1072.9351 BZ= 10148.7516
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 16 = VLA:_E48 BX= 2495.7756 BY= 9491.9086 BZ= -3654.7132
> Mount=ALAZ Axis offset= -0.0051 meters IFA IFB
> Feed polarization type = R L
> Type Q to stop, just hit RETURN to continue
>
> galaxy PRTAN(31DEC07) 3666 08-NOV-2007 13:34:14 Page 3
> File=19890123 .X BAND. 1 An.ver= 1 Vol= 1 User= 3666
> Array= VLA Freq= 8414.900000 MHz Ref.date= 23-JAN-1989
>
> Ant 17 = VLA:_N40 BX= -3854.6932 BY= -602.2908 BZ= 5698.9437
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 18 = VLA:_E40 BX= 1836.9563 BY= 6942.0859 BZ= -2665.2383
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 19 = VLA:_W32 BX= 1640.0293 BY= -4329.9432 BZ= -2416.6959
> Mount=ALAZ Axis offset= -0.0030 meters IFA IFB
> Feed polarization type = R L
>
> Ant 20 = VLA:_E16 BX= 376.9970 BY= 1440.9959 BZ= -556.1077
> Mount=ALAZ Axis offset= 0.0045 meters IFA IFB
> Feed polarization type = R L
>
> Ant 21 = VLA:_W16 BX= 499.8340 BY= -1317.9786 BZ= -735.2063
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 22 = VLA:_OUT BX= 0.0000 BY= 0.0000 BZ= 0.0000
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 23 = VLA:_E8 BX= 114.4356 BY= 438.6875 BZ= -169.4956
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 24 = VLA:_E24 BX= 765.2135 BY= 2889.4444 BZ= -1108.8953
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 25 = VLA:_E32 BX= 1253.2479 BY= 4733.6234 BZ= -1816.9223
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
> Type Q to stop, just hit RETURN to continue
>
> galaxy PRTAN(31DEC07) 3666 08-NOV-2007 13:34:14 Page 4
> File=19890123 .X BAND. 1 An.ver= 1 Vol= 1 User= 3666
> Array= VLA Freq= 8414.900000 MHz Ref.date= 23-JAN-1989
>
> Ant 26 = VLA:_E56 BX= 3241.9561 BY= 12366.0629 BZ= -4767.4608
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 27 = VLA:_N32 BX= -2629.1222 BY= -410.6663 BZ= 3885.6152
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 28 = VLA:_W40 BX= 2394.9629 BY= -6350.0183 BZ= -3550.9533
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
>
> Ant 29 = VPT:_OUT BX= 0.0000 BY= 0.0000 BZ= 0.0000
> Mount=ALAZ Axis offset= 0.0000 meters IFA IFB
> Feed polarization type = R L
> Type Q to stop, just hit RETURN to continue
>
> galaxy PRTAN(31DEC07) 3666 08-NOV-2007 13:34:15 Page 5
> File=19890123 .X BAND. 1 An.ver= 1 Vol= 1 User= 3666
> Array= VLA Freq= 8414.900000 MHz Ref.date= 23-JAN-1989
>
> Location Of VLA Antennas
>
> N72 ( 2)
> N64 ( 8)
> N56 (15)
> N48 ( 6)
> N40 (17)
> N32 (27)
> N24 ( 3)
> N16 (13)
> N8 ( 5)
> ( 9) W8 E8 (23)
> (21) W16 E16 (20)
> ( 4) W24 E24 (24)
> (19) W32 E32 (25)
> (28) W40 E40 (18)
> ( 1) W48 E48 (16)
> (12) W56 E56 (26)
> (11) W64 E64 (14)
> (10) W72 E72 ( 7)
> VLA:_OUT (22)
> VPT:_OUT (29)
> PRTAN1: Appears to have ended successfully
> PRTAN1: galaxy 31DEC07 TST: Cpu= 0.0 Real= 18
> AIPS 1: Resumes
>
>
>
> Quoting Eric Greisen <egreisen at nrao.edu>:
>
> > dbgob at brandeis.edu writes:
> > > Hello,
> > >
> > > When running task UVFIX on a data set (Project AL0187 from 1/23/89) it
> > > seems to change the observation uv distances from VLA scales to VLBA
> > > scales! I have encountered this once before but thought it a fluke. It
> > > seems to be more than a one time thing. Any idea what is going wrong?
> > >
> > UVFIX uses the frequency information in the header and the antenna
> > information in the AN file. If one of these is in error, then wrong
> > results will arise. Have you gotten a VLBA like AN file attached to a
> > VLA data set? Run PRTAN and see.
> >
> > The usual complaint about UVFIX is over fractions of a millimeter, not
> > hundred of miles!
> >
> > Eric Greisen
> >
>
>
>
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