[daip] [!12908]: AIPS - Fring passing failed solutions as good

[Jeffrey Hodgson]

Fring passing failed solutions as good
--------------------------------------

           Ticket ID: 12908
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12908
                Name: Jeffrey Hodgson
       Email address: jhodgson at mpifr-bonn.mpg.de
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 02 November 2018 03:08 AM
             Updated: 03 December 2018 08:00 AM
           Reply due: 05 December 2018 08:00 AM (2d 0h 0m)
      Resolution due: 15 August 2021 12:00 AM (985d 16h 0m)

Hi Eric,

Yes, that is interesting. It turns out that the 1/3rd good solutions
correspond to the reference antenna. Within the SN table themselves, we
have found these "good" solutions are flagged as "INDE", but nevertheless
have a weight of SNR cutoff+1.

When I say "passed" I meant that a low SNR solution is recorded as "good"
even though it is failed. Is there any way to force AIPS to record a
low-SNR solution as failed?

Cheers!

Jeff

On Tue, Nov 20, 2018 at 1:57 AM Eric Greisen  wrote:

> I don't have any good suggestions.  It is curious that
> it reports exactly 1/3 of the possible solutions as having
> worked.  Is it possible that it is failing on 2/3 of the
> antennas and working at some S/N ratio on the other
> 1/3?  Have you tried longer integration times?   Have you
> tried not fitting for rate (DPARM(9) 1)?
>
> I am told that some VLB data sets are so bad that CALIB
> with L1R and phase only is all that can be done.
>
> With large failure rates like this there is no point in continuing
> unless you can get that fixed.  I would be interested in what
> the SN table looks like after this FRING.  CLCAL will by default
> pass CL entries for failed solutions which is what I guess
> you mean by passed.
>
> Eric Greisen
>
>
> Ticket Details
> ------------------------------
> Ticket ID: 12908
> Department: AIPS Data Reduction
> Type: Issue
> Status: Response Overdue
> Priority: Default
>
> Helpdesk: https://help.nrao.edu/index.php?
>



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