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Introduction

Introduction. Johannes Böhm. Occam. Occam 6.1 LSM had some weaknesses equinox-based transformation between TRS and CRS only piecewise linear rates starting with the first observation old Fortran with COMMON blocks. Occam. Occam 6.1 LSM had some weaknesses no graphical interface

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Introduction

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  1. Introduction Johannes Böhm

  2. Occam • Occam 6.1 LSM had some weaknesses • equinox-based transformation between TRS and CRS only • piecewise linear rates starting with the first observation • old Fortran with COMMON blocks VieVS User Workshop 2010

  3. Occam • Occam 6.1 LSM had some weaknesses • no graphical interface • no handbook • developers separated by 10.000 km / 12 h • ... VieVS User Workshop 2010

  4. First idea to use Matlab .. • goes back to Thomas Hobiger in 2005 VieVS User Workshop 2010

  5. Why Matlab? • our students are experts in Matlab, but not in Fortran or C++ • nor are we • It is expensive, but there are non-commercial alternatives or we can provide executables VieVS User Workshop 2010

  6. Why did we develop VieVS? • to have VLBI software for students • to get them involved with bachelor, diploma and ph.d. theses • they can add their own tools • to have a clear structure • new modules can be added rather easily VieVS User Workshop 2010

  7. Why did we develop VieVS? • easy functional model with piecewise linear offsets at integer hours in the sense of GGOS • non-rotating origin right from the beginning (no equinox-based transformation) VieVS User Workshop 2010

  8. Why did we develop VieVS? VieVS User Workshop 2010

  9. Policy • Available for registered users • easier to get feedback • to be able to report bugs to the users • We are open for co-operation • new modules developed at other institutes • (e.g. co-authorship in VieVS handbook) VieVS User Workshop 2010

  10. Policy • OPT and outlier files will not be generally made available • these make the solutions different VieVS User Workshop 2010

  11. Outlook VieVS User Workshop 2010

  12. Data format • New IVS WG4 data format to be implemented (netcdf) VieVS User Workshop 2010

  13. Troposphere delays • from external files • ray-traced delays, VMF1, site pressure, NWM pressure, ... • only GMF/GPT internally VieVS User Workshop 2010

  14. VieVS Face-lifting • one interface VieVS User Workshop 2010

  15. SINEX • Results in SINEX format • getting operational in Vienna VieVS User Workshop 2010

  16. Close gap with raw observations • determination of ambiguities • (delay-rate) solution • phase solution for VLBI2010? • software correlator for short sessions??? VieVS User Workshop 2010

  17. Kalman Filter • and equivalent classical least-squares adjustment VieVS User Workshop 2010

  18. System • Test Octave and executables VieVS User Workshop 2010

  19. Source structure • Volunteers? VieVS User Workshop 2010

  20. Documentation!! VieVS User Workshop 2010

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