[daip] [!13162]: AIPS - DTSIM, still not ok

[Eric Greisen]

Eric Greisen updated #13162
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       Staff (Owner): Eric Greisen (was: -- Unassigned --)

DTSIM, still not ok
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           Ticket ID: 13162
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/13162
                Name: Thomas Krichbaum
       Email address: tkrichbaum at mpifr-bonn.mpg.de
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 13 December 2018 09:54 AM
             Updated: 14 December 2018 05:41 PM
      Resolution due: 07 September 2021 05:00 PM (997d 23h 19m)

Yes - in fact the old code is correct.  RR and LL do wander apartin phase due to the difference in parallactic angle between the2 telescopes.  I suspect that the DiFX correlator "corrects" thiswith a phase shift.  I have added to the old code two corrections1. We must do this whether or not the D terms are non-zero2. By default, I will correct for the parallactic angle (a la CLCOR)so that a point source at the origin has a constant I visibility.  To get the actual observed vis one can set DPARM(4) > 0 and thenthe code does not do the correction.Note that I also changed to polarization type to APPROX fromVLBI.  I am not sure what the latter does.Eric Greisen


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