Evaluation of the ITRF2020P reference frame by means of Satellite Laser Observations (SLR) data analysis

SLR data of LAGEOS-1/2 and Etalon-1/2 satellites were used for generating weekly solution sets containing station coordinates, Earth Rotation Parameters, as well as accommodating systematic range errors, for the period from 1993 to 2020. The solutions follow the approach developed within the ILRS Analysis Standing Committee, with smoothed systematic range errors applied to station range normal points where required. The satellite centre-of-mass corrections developed by Rodriguez et al (2019), and his continuing updates, were applied to the NP ranges. The solutions were used for an evaluation of the ITRF2020P reference frame and to conduct comparisons to ITRF2014. Following our previous investigations into the impact on the scale of the ITRF of systematic range errors, we investigate in particular the difference in scale of the reference frame from our current solutions when mapped using weekly Helmert transformations onto ITRF2014 and onto ITRF2020P.