The Potsdam Open-source Radio interferometry Tool (PORT) is a software package dedicated to the analysis of modern and historical very long baseline interferometry (VLBI) observations. PORT is being developed at GFZ and is utilized to perform the GFZ VLBI Analysis Center responsibilities, as well as state-of-the-art research in the field of space geodesy, geophysics, and astrometry.

PORT can estimate quantities such as station positions, quasar positions, Earth orientation parameters, atmospheric delay parameters, either employing weighted least-squares or a Kalman filter and smoother. PORT is designed to process VGOS observations, as well as traditional S-/X-band and single-band observations, regardless of data length; PORT processes both, intensive and multi-hour/day sessions. Developing PORT, special care has been taken to deal with issues such as the source structure. PORT abides by the latest analysis standards suggested by the IERS (International Earth Rotation and Reference Systems Service) and the IVS (International VLBI Service for Geodesy and Astrometry), and supports ITRF2020.

PORT is written mainly in MATLAB, with some Python modules and bash scripts.

More information on the software package you can find here: https://git.gfz-potsdam.de/vlbi-data-analysis/port