Introduction

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VieVS User Workshop 7 – 9 September, 2010 Vienna Introduction Johannes Böhm

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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 - PowerPoint PPT Presentation

Transcript of Introduction

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VieVS User Workshop7 – 9 September, 2010

Vienna

IntroductionJohannes Böhm

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VieVS User Workshop 2010 2

OccamOccam 6.1 LSM had some weaknesses

equinox-based transformation between TRS and CRS onlypiecewise linear rates starting with the first observationold Fortran with COMMON blocks

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OccamOccam 6.1 LSM had some weaknesses

no graphical interface no handbookdevelopers separated by 10.000 km / 12 h...

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First idea to use Matlab ..goes back to Thomas Hobiger in 2005

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Why Matlab?our students are experts in Matlab, but not in Fortran or C++nor are weIt is expensive, but there are non-commercial alternatives or we can provide executables

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Why did we develop VieVS?to have VLBI software for students

to get them involved with bachelor, diploma and ph.d. thesesthey can add their own tools

to have a clear structurenew modules can be added rather easily

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Why did we develop VieVS?easy functional model with piecewise linear offsets at integer hours in the sense of GGOSnon-rotating origin right from the beginning (no equinox-based transformation)

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Why did we develop VieVS?

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PolicyAvailable for registered users

easier to get feedbackto be able to report bugs to the users

We are open for co-operationnew modules developed at other institutes(e.g. co-authorship in VieVS handbook)

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PolicyOPT and outlier files will not be generally made available

these make the solutions different

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Outlook

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Data formatNew IVS WG4 data format to be implemented (netcdf)

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Troposphere delaysfrom external files

ray-traced delays, VMF1, site pressure, NWM pressure, ...

only GMF/GPT internally

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VieVS Face-liftingone interface

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SINEXResults in SINEX formatgetting operational in Vienna

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Close gap with raw observationsdetermination of ambiguities(delay-rate) solutionphase solution for VLBI2010?software correlator for short sessions???

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Kalman Filterand equivalent classical least-squares adjustment

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SystemTest Octave and executables

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Source structureVolunteers?

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Documentation!!


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