T. Hobiger R. Ichikawa Y. Koyama T. Gotoh T. Otsubo T. Kubooka

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Presentation transcript:

T. Hobiger R. Ichikawa Y. Koyama T. Gotoh T. Otsubo T. Kubooka Plans for the Vienna VLBI Software VieVS J. Boehm H. Spicakova L. Plank K. Teke A. Pany J. Wresnik S. Englich H. Schuh T. Hobiger R. Ichikawa Y. Koyama T. Gotoh T. Otsubo T. Kubooka

Contents Motivation Why Matlab? Occam to VieVS Further plans

We have been using and developing Occam. However, we found that .. Motivation We have been using and developing Occam. However, we found that ..

Motivation Occam has become unnecessarily complex, e.g. obsolete models (e.g. equinox based transformation) many functional models for estimated parameters Occam does not fulfill modern requirements, e.g. zenith wet delays at integer hours Our students are not familiar with Fortran but they are experts in Matlab

Why Matlab? Many of our students would write bachelor-, master-, or ph.d.-theses about VLBI-related topics if they could use Matlab Many built-in tools and functions, e.g. netcdf readers and writers matrix tools Plotting tools are very convenient etc.

Arguments against Matlab Matlab is a commercial software Many institutes use Matlab We can provide executables There is a non-commercial counterpart Octave Matlab is slower than Fortran or C Tests showed that this is not critical for our purposes

We do not start from scratch but .. Concept We do not start from scratch but ..

Occam to VieVS Occam VieVS dtau0 pn station geomet lsm dtau0 one common 'calc' lsm mostly done

Occam to VieVS We throw away lots of things, e.g. we only use piecewise linear offsets at integer hours for the least-squares adjustment x1 x x2 t1 t t2

VieVS Agreement with IERS Conventions Compatibility with VLBI2010 requirements Adoption of IVS WG4 data formats presumably netcdf exchange of provision of results

VieVS and related tasks VLBI2010 continue Monte-Carlo simulation studies add a Kalman Filter solution SCHED2010 attach a new scheduling software to VieVS Turbulence theory explore new parameterizations / stochastic models Global solutions

NICT works on own space geodetic software (GNSS, SLR and VLBI) Based on Python, bindings to C/C++ Co-operation with VUT to utilize experience gained from OCCAM and VieVS Share experience of NICT concerning amb. resolution, phase solution Work together on space-craft tracking and Space VLBI

NICT and VieVS Software correlator Ambiguity resolution New database - group delays - phase delays New database IVS WG4 Spacecraft tracking space VLBI phase solutions VieVS

Fringe plot