[daip] [!16728]: AIPS - Help Explaining Phase Calibrator Plots

[Eric Greisen]

Eric Greisen updated #16728
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Help Explaining Phase Calibrator Plots
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           Ticket ID: 16728
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/16728
                Name: Gregory Walsh
       Email address: gwalsh4758 at gmail.com
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 06 August 2020 11:49 AM
             Updated: 06 August 2020 04:23 PM
           Reply due: 10 August 2020 11:49 AM (3d 19h 25m)
      Resolution due: 02 May 2023 05:00 PM (999d 0h 36m)

This is curious to say the least.  You might want to plot real versus imaginary.  You seem to have peaks in amplitude at plus/minus 45 and 135 degrees.  Is it possible that the noise is so high in individual channels that they scatter all over.  Try looking at the spectrum with only a little time integration and only 1 baseline at a time (AIPS task POSSM for example).  Averaging all channels still seems rather too noisy.  Try plotting averaged amplitude versus uv distance or other parameters.
Cheers
Eric Greisen


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