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GFZ‘s software EPOS in the context of reprocessing

GFZ‘s software EPOS in the context of reprocessing. Maik Uhlemann , Sergei Rudenko, Thomas Nischan, Gerd Gendt Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum (GFZ) uhle@gfz-potsdam.de. EPOS E arth P arameter and O rbit determination S ystem. Developed at GFZ since 1993

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GFZ‘s software EPOS in the context of reprocessing

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  1. GFZ‘s software EPOSin the context of reprocessing Maik Uhlemann, Sergei Rudenko, Thomas Nischan, Gerd Gendt Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum (GFZ) uhle@gfz-potsdam.de

  2. EPOSEarth Parameter and Orbit determination System • Developed at GFZ since 1993 • Actual version: EPOS.P8 • GPS, GLONASS, Galileo capable • Perfectly adapted for GFZ’s Linux Compute Cluster • Technique: • Undifferenced carrier phase and pseudo range observations • IGS models and latest IERS standards implemented • Least Square Adjustment • Fixing of 95% of ambiguities in global network solution • Analysis of >300 station in reasonable time w/o clustering IGS Workshop, 30 June 2010, Newcastle upon Tyne

  3. Processing Schemes IGS sites Data Analysis SINEX, ERP GFZ IGS (GF1) 1994-2007 Total: 272 sites NEQ ORBIT, CLOCK Fixed TIGA + 30 GF1 sites Data Analysis SINEX, ERP GFZ TIGA (GT1) 1998-2007 Total: 403 sites NEQ Contribution of 2 Analysis Centres to Repro1: IGS Workshop, 30 June 2010, Newcastle upon Tyne

  4. Conclusions / Lessons learned • Significant improvement in quality and homogeneity of delivered products w.r.t. operational solutions  Poster presentation “GFZ Results of the first IGS Data Reprocessing Campaign” • Good software validation test • Analysis of early 1990s needed more manual interactions • Determination of bad STA/SAT to be excluded  Common list over all ACs ? • IGS_WITH_FORMER.SNX apparently incomplete • Duration of reprocessing @ Linux Compute Cluster: • Process 1 year of GPS data & inspect results: ~ 1.5 weeks • Total CPU time consumed (GF1) : ~ 673 days IGS Workshop, 30 June 2010, Newcastle upon Tyne

  5. Thank you for your attention IGS Workshop, 30 June 2010, Newcastle upon Tyne

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