[daip] CL ver 1 geodelay calculation problem
Eric Greisen
egreisen at nrao.edu
Mon Jul 28 11:01:03 EDT 2008
Walter Brisken wrote:
> For VLBI files, the CL tables have a column called GEODELAY which contains
> a tabulated listing of the delay model at each CL interval. I have an
> example FITS-IDI file, straight off the VLBA hardware correlator, where
> FITLD results in this column containing nothing but zeros until row 11149,
> where reasonable values start. I have confirmed that the two model
> tables, IM and MC, have valid values for the duration of the file.
> Removing NX1 and CL1 and running INDXR results in a CL1 table with zero
> GEODELAY for the entire length of the file. I have tested FITLD with
> values of CLINT ranging from 0.016667 to 1 minute, always with similar
> results.
>
> This problem exists both in NEW and TST versions and is consistently
> reproducible. The file I found that demostrates this problem is:
>
> /home/parallax/7200001.FITS
I think I see where it is going wrong. The one FITS file has 2 UV
tables in it. The GEODLY values are set for the time range matching the
2nd table only. My bet is that it does not do the clean-up pass in the
first table when there are 2 tables in one file. That is an error, but...
Eric Greisen
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