[daip] [!9780]: AIPS - FRPLT

[Lynn Matthews]

Lynn Matthews updated #9780
---------------------------

FRPLT
-----

           Ticket ID: 9780
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/9780
           Full Name: Lynn Matthews
               Email: 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: 31 January 2017 10:42 PM
             Updated: 31 January 2017 10:42 PM
                 Due: 02 February 2017 10:42 PM (2d 0h 0m)
      Resolution Due: 08 February 2017 10:42 PM (8d 0h 0m)



I have a concern about the way that FRPLT is handling SOLINT and/or scan boundaries.

I have a data set with 4-minute scans and an NX table. Data were sorted in TB order with MSORT. The same source is observed multiple times, but never in consecutive scans, e.g.,

Scan      Source      Qual  Calcode Sub         Timerange          FrqID   START
   1 0501-019        : 0000           1  0/15:08:00 -   0/15:12:00     1       1
   2 0510+180        : 0000           1  0/15:15:00 -   0/15:19:00     1   21001
   3 0501-019        : 0000           1  0/15:22:00 -   0/15:26:00     1   42001
...

To illustrate the potential issues, I attach two groups of plots.

The first 3 plots (SOLINT*.png) show results from 3 passes of FRPLT on a single baseline. 

I select source 0510+180, TIMER 0, and then set SOLINT to 5.0, 4.1, and -1, respectively.  My understanding is that each case should produce an identical plot, based on data from scan 1 of 0510+180. However, the resulting plots are all different. (In contrast, these adverb selections all produce identical cross-power spectra in POSSM.)

In Example 2, I again selected source 0510+180, but set SOLINT=0. 

Plot 4 (TIMER1+SOLINT0.png) shows the result for TIMERANG=0 15 0 0, 0 15 18 59.
Plot 5 (TIMER2+SOLINT0.png) shows the result for TIMERANG=0 15 15 01, 0 15 18 59.

Again, I expect identical plots that include only data from the first scan of 0510+180. However, the results are quite different.

Thanks,
Lynn Matthews




------------------------------------------------------
Staff CP:  https://help.nrao.edu/staff
-------------- next part --------------
A non-text attachment was scrubbed...
Name: SOLINT5.0.png
Type: image/png
Size: 24601 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/daip/attachments/20170131/c9fbecfc/attachment-0005.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: SOLINT4.1.png
Type: image/png
Size: 24441 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/daip/attachments/20170131/c9fbecfc/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: SOLINT-1.png
Type: image/png
Size: 23473 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/daip/attachments/20170131/c9fbecfc/attachment-0007.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: TIMER1+SOLINT0.png
Type: image/png
Size: 30643 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/daip/attachments/20170131/c9fbecfc/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: TIMER2+SOLINT0.png
Type: image/png
Size: 23821 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/daip/attachments/20170131/c9fbecfc/attachment-0009.png>