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Old June 22nd 09, 11:40 PM posted to sci.geo.satellite-nav
Mike Jr
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Posts: 60
Default The NOG - AFSPC Media Telecon for IIR-20M (svn 49, prn 01) problem

Here is another take on Friday's meeting.

http://blogs.agi.com/navigationAccuracy/

"Question: How is the fix for this problem modeled? Is it a constant
bias or something else?

Answer: (Madden) The fix effectively moved the antenna phase center
for the satellite to 150 meters behind the satellite.

Question: What navigation parameters are being changed to implement
this fix?

Answer: (Thomas Powell, Aerospace) The ephemeris phase center value
(later determined to be the Tgd value) and the clock offset values are
being modified to allow user's receiver to get a correct URE for this
satellite."

With an elevation dependent error, I wonder how this is supposed to
work. Anybody?

BTW, AFSpace is on Twitter. http://twitter.com/afspace

--Mike Jr
 

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