[IGSMAIL-4530]: CODE ultra rapid GNSS orbits
Stefan Schaer
stefan.schaer at aiub.unibe.ch
Wed Jul 30 07:53:59 PDT 2003
******************************************************************************
IGS Electronic Mail 30 Jul 07:54:02 PDT 2003 Message Number 4530
******************************************************************************
Author: Stefan Schaer
Dear colleagues,
Until recently, the CODE, or COU ultra rapid orbits/ERPs were directly
derived from our rapid products. These results were actually pure
predictions and were therefore treated in the IGU combination just for
comparison purposes (although the previous IGU combined SP3 orbit files
indicated COU as contributing analysis center).
The current COU orbit/ERP products are now real (i.e., supported by
hourly observation data). As a matter of fact, our ultra rapid products
are GNSS products, since we do not only consider GPS but also
GPS/GLONASS-mixed hourly observation data in our ultra rapid analysis.
It should be mentioned that the IGLOS data volume with respect to
hourly data is (still) very limited (DWH1, UNB1, plus many European
stations). Anyway, the quality of COU GLONASS orbits is already
significantly better than that of broadcast information. We hope that
other IGLOS stations (in particular all remote IGLOS stations!) are
encouraged to supply hourly observation data.
Those of you interested in the quality assessment of COU GPS orbits
are referred to the most recent igu-cmp-sum (comparison) files and
future igu-sum (combination) files stored at
ftp://cddisa.gsfc.nasa.gov/pub/gps/products/
or made available by the IGS ACC at
ftp://ftp.gfz-potsdam.de/pub/pub/igsacc/product/ultra/
COU products should be considered for the first time in today's 15-UT
IGU combination.
Many thanks to Gerd Gendt for the adaptations in this regard.
Best regards,
Stefan
More information about the IGSMail
mailing list