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OLG LAC Reprocessing EPN 2006

OLG LAC Reprocessing EPN 2006. G. Stangl 1 , C. Aichhorn 2 , S. Krauss 2 (1) Federal Office of Metrology and Surveying (BEV) ‏ (2) Space Research Institute, Austrian Academy of Science. Hardware + System Software. Hardware Server Intel Xeon E5520 Quadcore 12 GB Memory 1 TB Disk space

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OLG LAC Reprocessing EPN 2006

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  1. OLG LAC Reprocessing EPN 2006 G. Stangl1, C. Aichhorn2, S. Krauss2 (1) Federal Office of Metrology and Surveying (BEV)‏ (2) Space Research Institute, Austrian Academy of Science

  2. Hardware + System Software • Hardware • Server Intel Xeon E5520 Quadcore • 12 GB Memory • 1 TB Disk space • 6x 1 Gigabit LAN • System Software • Xen Server‏ • Virtual Workstation • Now: Linux Debian 5.0.3 (32bit) • Upcoming: CentOS 5.5 (64bit) • Qt 3.3.8 | C-Compiler v4.4 • 2 GB Memory (variable) EPN LAC Workshop Warszawa 2010 IWF/ÖAW GRAZ 2

  3. Bernese Software + Data • Bernese Software • Bernese Software 5.0 release February 10 • Qt 3.3.8 • C-Compiler v4.4 • Now: Intel Fortran Compiler v8.1 • Future: g95-x86_64-32 Integer Fortran Compiler • Data • IGP1 : IGS orbits + clocks + EOPs‏reprocessed • RINEX daily files corrected by ROB DC • ITRF2005 coordinates + velocities a priori for minimum constraint stations from EPN cumulated solution‏ EPN LAC Workshop Warszawa 2010 IWF/ÖAW GRAZ 3

  4. OLG LAC Reprocessing Network Similar to OLG EPN sub-network +20 stations from other OLG networks + 10 completely new stations OLG LAC EPN OLG LAC Reprocessing 4 EPN LAC Workshop Warszawa 2010

  5. Analysis Strategy • Bernese Software • 3° minimum elevation • L5/L3 ambiguity resolution • Dry Niell a priori + Zenith delays + troposphere gradients wet Niell estimated • Minimum constraints to BOR1, BUCU, GOPE, GRAZ, PENC, SOFI, ZIMM • Network design • Predefined baselines, mainly based on shortest distance strategy • Automation by Bernese Processing Engine, manual afterwork (e.g. exchange of bad baselines) • Every day Helmert 7 parameter transformation on all IGS ‏stations with a priori coordinates (solution check) EPN LAC Workshop Warszawa 2010 IWF/ÖAW GRAZ 5

  6. Time and Problem Handling • Preparation time without RINEX file check 20 minutes per week‏ • Computing time BPE 140 minutes per week • Manual checking 10-60 minutes per week • Manual problem solving + rerun 0-120 minutes per week • Outlier = North/East component exceeds 10 mm, Up exceeds 20 mm • Problem checking independently from existing OLG database of outliers • Automatic exclusion of RINEX files less than 12 hours • Baseline changes to improve results (most frequently VLNS-RIGA-METS to VLNS-METS-RIGA) • If no improvement, outliers removed from weekly normal equation (still there in daily normal equation) • 31 baseline exchanges (14 times VLNS-RIGA) )~0.1% of all processed ones, almost all improved the solution EPN LAC Workshop Warszawa 2010 6

  7. Statistical Comparison Reprocessing – Old Processing • 88 Stations, 12 of them never processed by OLG LAC before • 46 out of 76 common ones with documented outliers • Number of stations with outliers remains approximately the same 39 -> 36 • Total number of outliers reduced from 139 to 92 • Main characteristics of improvement: • Better estimation of troposphere • Minimum constraint more stable than constraint to one station • 3° degree elevation provides more data per station EPN LAC Workshop Warszawa 2010 IWF/ÖAW GRAZ 7

  8. Conclusions • 200 hours processing for the whole year is affordable, but more speed is required (e.g. 4 years per year) • Problems can be seen more clearly because of the reduction of processing noise (heights) • All problems = outliers with physical, human and electronic background remain –> need for further analysis? • Some network problems depend on network design (outliers are compensated by minimum constraint) ->re-reprocessing with improved station velocities and global station distribution? EPN LAC Workshop Warszawa 2010 IWF/ÖAW GRAZ 8

  9. Thank you

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