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       <gco:CharacterString>The German Research Center for Geosciences (GFZ) is providing ultra rapid multi-GNSS orbit-, clock- and EOP-product series (EOP = Earth Orientation Parameters). 
 
      
 
The Orbit/Clock product covers the following Global Navaigation Satellite Systems (GNSS)
 - GAL (Galileo) / Europe
 - GPS (GPS) / USA
 - GLO (Glonass) / Russian Federation
 - BDS (Beidou) / PR China
 - QZS (QZSS) / Japan
 
All products are estimated using the latest version of GFZ's automated EPOS-8 GNSS
processing environment and using global hourly RINEX observation data of the
International GNSS Service (IGS).
 
      
 The orbit/clock product is provided:
 - in the SP3-c data format,
 - every 3 hours with a nominal latency of 2 hours after the last observation,
 - with a 48 hour sliding window orbit duration 
  (1) the first 24 hours are estimated based on real GNSS RINEX observation data, 
  (2) the second 24 hours consist of an orbit/clock prediction,
 - the orbit positions epoch interval is of 15 minutes.
 
      
 The EOP product is provided:
 - in the IGS ERP data format,
 - every 3 hours with a nominal latency of 2 hours after last observation,
 - with one estimated 24 hour EOP record based on real GNSS RINEX observation data,
 - with one predicted 24 hour EOP record.
 
      
 
For recent (latest) products used for routine applications a registration via mgnss@gfz-potsdam.de is needed
to get special access. Products with an age older than 2 days are available without restrictions.
 
      
 
For the used data formats see Kouba and Mierault (2010, https://igscb.jpl.nasa.gov/igscb/data/format/erp.txt) for the description of the EOP Product Series and Hilla (2010, https://igscb.jpl.nasa.gov/igscb/data/format/sp3c.txt) for the description of the Orbit-/ Clock format SP3-c). The time series are provided in weekly folders, beginning with 27 May 2015 (GPS Week 1846). </gco:CharacterString>
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