[daip] CLCOR position shifting

[Craig Walker]

I was waiting for an answer from the AIPS group, but haven't seen one. 
Only they can answer your direct question.

But one diagnostic question - is the SNR good enough to see the data 
phases?  If so, what do they look like when you try to correct the 
position.  They should be reasonably flat and, if CLCOR is messing 
things up badly enough that FRING can't find anything, they should be 
all over the map.

Cheers,

Craig

P.S. Mark,  Will you be at the AAS?


Mark Reid wrote:
> 
> Dear DAIPser:
> 
>    I have been trying to debug some procedures (runfiles) for our VLBA 
> Key Project for parallax measurements.  As a test I observed/correlated 
> some calibrators at their correct positions and offset by ~1 arcsecond.
> I then FRINGe fit the data, getting delays and rates, and then solve for 
> position offsets.  This seems to work well.
> 
> However, when I correct the data processed at the offset positions by 
> running CLCOR (ANTC), I no longer get any FRINGe solutions.  Before I 
> spend a lot of time figuring out what I may have done wrong, I thought I 
> would ask if there is any chance that (31Dec09) CLCOR does not "know" 
> that the Y-station coordinates have been changed?
> 
> Mark
> 
> -------------------------------------------------------------
> Mark J. Reid                 Phone: 617-495-7470
> Harvard-Smithsonian CfA      Fax  : 617-495-7345
> 60 Garden Street             Email: reid at cfa.harvard.edu
> Cambridge, MA 02138, USA     Web  : www.cfa.harvard.edu/~reid
> -------------------------------------------------------------

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