[evlatests] WIDAR baselines, and time offsets

[Eric Greisen]

Barry Clark wrote:

>>>    While making the comparisons noted above, I noticed that the two
>>> databases are not precisely identical in their time axes.  Michael R.
>>> noted some time delay between the arrays while the data were taken.  I
>>> can confirm this, based on the index files of the two (supposedly)
>>> parallel sets:  The VLA dataset is 32 seconds behind the WIDAR dataset.
>>> In other words, all scans in the VLA dataset start and stop 32 seconds
>>> later than those in the WIDAR dataset.
>> I would expect 33 seconds.  Data from the VLA correlator is
>> labelled in IAT, while data from Widar seems to be labelled
>> in UTC.  I hope that the sign of IAT-UTC is consistent with
>> what you describe.
>>
> Does uvfix know about this?
>
I don't know how, but the u,v,w from the corrected uvfix (for By sign 
etc) gets answers very close to the original values - certainly not 34 
seconds off.

Eric