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VieVS User Workshop
7 – 9 September, 2010
Vienna
Introduction
Johannes Böhm
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Occam
Occam 6.1 LSM had some weaknessesequinox-based transformation between TRS and CRS only
piecewise linear rates starting with the first observation
old Fortran with COMMON blocks
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Occam
Occam 6.1 LSM had some weaknessesno graphical interface
no handbook
developers 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 we
It 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 studentsto get them involved with bachelor, diploma and ph.d. theses
they 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 GGOS
non-rotating origin right from the beginning (no equinox-based transformation)
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Why did we develop VieVS?
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Policy
Available for registered userseasier to get feedback
to 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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Policy
OPT and outlier files will not be generally made available
these make the solutions different
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Outlook
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Data format
New IVS WG4 data format to be implemented (netcdf)
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Troposphere delays
from external filesray-traced delays, VMF1, site pressure, NWM pressure, ...
only GMF/GPT internally
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VieVS Face-lifting
one interface
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SINEX
Results in SINEX format
getting operational in Vienna
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Close gap with raw observations
determination of ambiguities
(delay-rate) solution
phase solution for VLBI2010?
software correlator for short sessions???
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Kalman Filter
and equivalent classical least-squares adjustment
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System
Test Octave and executables
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Source structure
Volunteers?
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Documentation!!