[IGSMAIL-6255] PRN21 orbit problems on 2010-09-11
Jim.Ray
jim.ray at noaa.gov
Mon Sep 13 05:27:28 PDT 2010
Author: Jim Ray
As real-time users have already noticed, IGS orbits for
PRN21 were highly unreliable for PRN21 on Saturday,
2010-09-11. The Ultra-rapid orbits (both observed &
predicted) started getting gradually worse during the
1st half of that day but became very bad in the 2nd half.
The WRMS orbit residual for the IGU combined predictions
for 1600_6_12 (wrt IGS Rapid) reached 48 cm overall
during the 1st 6 hr and was 4.10 m for PRN21. But the
IGR orbit for PRN21 itself was not necessarily reliable
for that day.
The cause of this event is presently unknown to me.
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