[IGSMAIL-6217] ESOC Analysis Changes

[Tim.Springer at esa.int]

Author: Tim Springer


Dear IGS Colleagues,

Today, starting with our Ultra-Rapid solutions of 12 o'clock (day 217 of 
2010), we are switching all our IGS GNSS analysis to use the latest 
release of our NAPEOS software, version 3.5. At the same time we also 
switch the processing platform from our older Sun machines to more up to 
date PCs running the Linux OS. 

Although the latest NAPEOS version does offer several enhanced processing 
features these are not yet used in our IGS analysis. So the more important 
change right now is the hardware change which improves the speed of our 
processing with a factor of 4. This has allowed us to enhance our 
Ultra-Rapid analysis in the following ways:
Increase the number of stations from 85 to 110 making the number the same 
as used in our FINAL analysis
Use the pseudo-range observations of the GLONASS satellites, something we 
did not do until now to save on CPU time.
Wait a bit longer for the last hourly RINEX files, meaning we now start 30 
minutes after the last hour instead of 20 minutes.

Despite these changes our Ultra-Rapid solutions are finished much earlier 
then they used to be and are available ~1 hour before the IGS submission 
deadline. 

We would like to remind you that all our IGS products are true GNSS 
products, i.e., based on a fully combined analysis of the GPS and GLONASS 
observations.

These changes have been carefully tested but if you notice anything 
strange please let us know ASAP.

Many greetings,
Tim Springer
ESOC IGS Analysis Team


---------------------
Tim Springer
Navigation Support Office, OPS-GN (nng.esoc.esa.de)
European Space Operations Centre
Robert Bosch Strasse 5
64293 Darmstadt
Germany
Tel: +49-6151-90-2029  Fax: +49-6151-90-3129
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