The International Terrestrial Reference System (ITRS) realization ITRF2020 and its update

• Autores: Collilieux, X.; Altamimi, Z.; Rebischung, P.; Métivier, L.; Barnéoud, J.; Chanard, K.; de La Serve, M.
• Año de publicación: 2025
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: Ciencias Astronómicas; International Terrestrial Reference Frame (ITRF); Reference system realization; Earth Orientation Parameters (EOP)
• Institución: Universidad Nacional de La Plata

According to the International Union of Geodesy and Geophysics (IUGG) 2007 and 2019 resolutions, the International Terrestrial Reference System (ITRS) is the preferred Geocentric Terrestrial Reference System (GTRS) for scientific applications. Its realizations, the International Terrestrial Reference frames, are the standards for positioning, satellite navigation and Earth Science applications. They are built on international cooperation over more than three decades for the benefit of global geodesy, geodynamics as well as astronomy. Substantial improvements have been constantly made in the data analysis strategy, at the level of both individual geodetic techniques, as well as the ITRF combination, with the aim to improve the ITRF accuracy and reliability. Since 1990, 14 realizations of the ITRS, named ITRFyy, have been published, from ITRF88 to ITRF2020. A short history of the ITRF series will be presented highlighting how the orientation of the latest ITRFs was defined, which impacts long-term polar motion and UT1-UTC trends. The ITRF2020 products will be described and an evaluation of the uncertainty of the frame parameters presented. More recently, the ITRS Center decided to regularly update the ITRF2020, with its first update, ITRF2020-u2023 released in December 2024. Although individual station coordinates have changed, the ITRF2020-u2023 frame parameters are identical to those of ITRF2020 within the uncertainty of a 14-parameter similarity transformation. The main differences between ITRF2020 and its update, in terms of both individual station coordinates and EOPs will be discussed. Future plans for ITRF updates will conclude the presentation.
Facultad de Ciencias Astronómicas y Geofísicas