[daip] [!16073]: AIPS - UVRMS

[Eric Greisen]

Eric Greisen updated #16073
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UVRMS
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           Ticket ID: 16073
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/16073
                Name: Lynn Matthews
       Email address: lmatthew at haystack.mit.edu
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 22 April 2020 01:07 PM
             Updated: 22 April 2020 03:37 PM
           Reply due: 24 April 2020 01:07 PM (1d 21h 29m)
      Resolution due: 16 January 2023 05:00 PM (999d 1h 22m)

BLAVG is not the simple task that you are assuming.  It averages RL and LR and outputs them as RR and LL after much manipulation of phase,  "Note that this method of averaging will retain ONLY the relative phase and delay differences between the IFs." is a quote from the explain file.  I have been playing with UVRMS some more using UVMOD output with a simple point source model (at 0 and offset a bit) and the results appear to make sense.
Try a single baseline to start with.  Averaging baselines with my offset model produced some interesting oddities particularly in phase (the data set is VLBA so only 45 baselines max).  When I did a single baseline a simple curve of phase with some noise comes out, averaging all baselines makes a real mess.  The 2 plots of UVRMS are crucial - the statistical values only have value in well behaved cases.  The CASA task does not do the plots.  I am mostly done with the spectral one which makes 2 plots, the mean and standard deviation of the selected OPTYPE.
Glad you solved the MNJ issue.
Eric




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