Realisation of ITRF2020

The International Terrestrial Reference System (ITRS) is realised in the form of the International Terrestrial Reference Frame (ITRF), resulting from an inter-technique combination of all four space-geodetic techniques:

Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS)
Global Navigation Satellite Systems (GNSS)
Satellite Laser Ranging (SLR)
Very Long Baseline Interferometry (VLBI)

The official IVS contribution to ITRF2020 and its updates (ITRF2020-u2024, ITRF2020-u2025) has been computed and validated by the IVS Combination Centre and submitted to the ITRS Combination Centres.