ITRF2020: main results and key performance indicators

Abstract

<p>More than 30 years of space geodetic data have been reprocessed<br>by the International Association of Geodesy technique services<br>and submitted to compute the new realization of the<br>International Terrestrial Reference System (ITRS). The new<br>realization, ITRF2020, is intended to replace ITRF2014. It is<br>provided in the form of an augmented reference frame so that in<br>addition to station positions and velocities, parametric<br>functions for both post-seismic deformation (PSD) and seasonal<br>signals (expressed in the Center of Mass frame derived from<br>Satellite Laser Ranging data) will also be delivered to the<br>users. The presentation summarizes the main results of ITRF2020<br>analysis and evaluates its internal consistency via some key<br>performance indicators. In particular, the paper discusses the<br>level of the scale agreement between the four techniques, its<br>linear and nonlinear time evolution, and the strategy adopted<br>for the ITRF2020 scale definition. In addition, we evaluate the<br>performance of the parametric functions for both seasonal<br>signals and PSD and the level of consistency between the four<br>techniques at colocation sites.</p>