Paris Observatory Geodetic VLBI Center

This center is a component of the International VLBI Service for Geodesy and Astrometry (IVS) hosted by the LTE (Laboratoire Temps Espace), Observatoire de Paris, Université PSL, CNRS UMR8255, Sorbonne Université, Université de Lille.

Analysis Service

These products are obtained by processing S/X (2/8 GHz) and VGOS single and multibaseline experiments with the NASA Calc/Solve geodetic VLBI analysis software package. K-band (22 GHz) experiments are not analyzed (yet).

• Current solution 2025b
  • Earth orientation and reference frames from global solution,
  • Universal time UT1 from intensive experiments,
  • Baseline and station coordinate time series,
  • Zenith troposphere delay time series,
  • Radio source coordinate time series,
  • Celestial reference frame.
• Other products
  • Free core nutation follow-up,
  • General statistics on the observations,
  • Take a look at the VLBI network on Google Maps.

Data Center

The data center is one of the three IVS primary data centers (with NASA/CDDIS and BKG). You can

• Download VLBI data and products via FTP at ivsopar.obspm.fr, and
• Submit VLBI data and products: please contact us to obtain the procedure.