To: igsmail@igscb.jpl.nasa.gov Subject: [IGSMAIL-5696]: ESOC IGS Analysis Change! Message-ID: From: Tim.Springer@esa.int Date: Fri, 1 Feb 2008 15:21:18 +0100 Content-Type: text/plain; charset="us-ascii" Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 01 Feb 06:21:32 PST 2008 Message Number 5696 ****************************************************************************** Author: Tim Springer Dear IGS Colleagues, A little bit later today we will submit our "brand new" IGS final products. From now on (GPS week 1463) our IGS final products will based on our new software Napeos. Our Rapid and Ultra-Rapid IGS products will still be moved over to our new software by the end of February. A few specifics about our solutions. The orbits are based on 24-hour data spans. The ERP parameters are estimated as offset and drift per day without any constraints at the day boundaries. The Sinex solution is based on stacking seven 24-hour solutions (so not data overlap what so ever). Our Sinex files contain the fully unconstrained normal equation system and also our (constrained) solution Our "esa" IGS products are based on GPS only Our "esx" IGLOS products are based on GPS and Glonass and contain the orbits and clocks of both systems Currently we make two "full" solutions. One based on only GPS data, the other based on GPS and Glonass data. In the near future we will submit only the results from our GPS/Glonass combined solutions. However, at the moment we have a small problem with our GPS/Glonass Sinex files which is why our "esa" products are still "GPS only". The "esx" products are based on GPS/Glonass combined with both systems full estimated. The "esx" orbit files contain both GPS and Glonass satellites (I hope this is not a problem for the IGLOS combination). The GPS orbits are practically identical to the "esa" solution but not 100% the same. We have taken a lot of care to test our new software. The new software has already been used within the Galileo Geodetic Service Provider (GGSP) project where it produces IGS Final like results (orbits, clocks, ERPs, and Sinex). It has also been used for reprocessing the first 3 months of the year 2000 in the framework of the IGS reprocessing efforts. Furthermore, the testing also included a reprocessing of the full year 2007. The results of that reprocessing will be submitted as part of our IGS reprocessing efforts soon. Despite all these testing efforts it may still happen that there is something wrong with our products. So in case you notice anything strange with our new products, please, do contact us so that we can solve the problem ASAP. Last but not least, we have updated (or rather created from scratch) our Analysis Centre questionnaire and send it to the IGSCB. So it should be publicly available soon. Kind regard, Tim Springer on behalf of the ESA/ESOC GNSS Analysis Team --------------------- Dr. Tim Springer Navigation Support Office, OPS-GN (www.nng.esoc.de) European Space Operations Centre Robert Bosch Strasse 5 64293 Darmstadt Germany Tel: +49-6151-90-2029 Fax: +49-6151-90-3129