[daip] [!9104]: AIPS - S/N in gaincal in CASA

[Eric Greisen]

Eric Greisen updated #9104
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              Status: Closed (was: Open)

S/N in gaincal in  CASA
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           Ticket ID: 9104
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/9104
           Full Name: Laura Chomiuk
               Email: chomiuk at pa.msu.edu
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Closed
            Priority: Default
      Template Group: Default
             Created: 07 October 2016 05:24 PM
             Updated: 07 November 2016 10:51 PM



The data weights are taken to be proportional to 1/sigma^2 to start
with.  Then the weights of the data entering into calibration, having
been divided by the model,  are changed to reflect the model scaling.
This can down-weight outer spacings a lot so WEIGHTIT allows you
to reduce the effect of the noise scaling to 1/sigma or 1/sqrt(sigma)
or even no weighting.

The SNR computed by AIPS is antenna dependent and is set by
1 / RMS phase residual in radians in each solution interval.

Eric




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