Introduction

VieVS User Workshop7 – 9 September, 2010

Vienna

IntroductionJohannes Böhm

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

OccamOccam 6.1 LSM had some weaknesses

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

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

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

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

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)

Why did we develop VieVS?

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)

PolicyOPT and outlier files will not be generally made available

these make the solutions different

Outlook

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

Troposphere delaysfrom external files

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

only GMF/GPT internally

VieVS Face-liftingone interface

SINEXResults in SINEX formatgetting operational in Vienna

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

Kalman Filterand equivalent classical least-squares adjustment

SystemTest Octave and executables

Source structureVolunteers?

Documentation!!

Introduction

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