Abstract
The Potsdam Open Source Radio Interferometry Tool (PORT) is the very long baseline interferometry (VLBI) analysis software developed and maintained at the GFZ German Research Centre for Geosciences. Chiefly, PORT is tasked with the timely processing of VLBI sessions and post-processing activities supporting the generation of celestial and terrestrial reference frames. In addition, it serves as a framework for research and development within the GFZ’s VLBI working group and is part of the tool set employed in educating young researchers. Starting out from VLBI group delays, PORT estimates station and radio sources positions, as well as Earth orientation parameters, tropospheric parameters, and station clock offsets and drifts. The estimation procedures take into account all the necessary data analysis models that were agreed on for contributing to the ITRF2020 processing activities. The PORT code base is implemented in the MATLAB ® and Python programming languages. It is licensed under the terms of the GNU General Public License and available for download at GFZ’s Git server https://git.gfz-potsdam.de/vlbi-data-analysis/port.
Highlights
Introduction and MotivationAs one component of the four space geodetic techniques, very long baseline interferometry (VLBI) significantly contributes to our understanding of system Earth (Sovers et al 1998; Schuh & Behrend 2012; Schuh & Böhm 2013)
The retrieval of VLBI data products consists of multiple analysis steps12 beginning with the raw digitized signal from an extragalactic radio source recorded by the VLBI antennas and leading to the consolidated geodetic and astrometric parameters produced by the International VLBI Service for Geodesy and Astrometry (IVS, Nothnagel et al 2017) combination center; a
The Potsdam Open Source Radio Interferometry Tool (PORT) software addresses the level 2 data analysis step of the VLBI data processing pipeline. It reads in ambiguity-resolved group delay time series, that are calibrated to be approximately free of ionospheric delay effects
Summary
As one component of the four space geodetic techniques, very long baseline interferometry (VLBI) significantly contributes to our understanding of system Earth (Sovers et al 1998; Schuh & Behrend 2012; Schuh & Böhm 2013). The retrieval of VLBI data products consists of multiple analysis steps beginning with the raw digitized signal from an extragalactic radio source recorded by the VLBI antennas and leading to the consolidated geodetic and astrometric parameters produced by the International VLBI Service for Geodesy and Astrometry (IVS, Nothnagel et al 2017) combination center; a. We focus on the estimation of geodetic and astrometric parameters based on multi-band group delay observables
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