Systematic errors and combination of individual CRF solutions in the framework of the international pilot project for the next ICRF

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dc.creatorSokolova, Julia
dc.creatorMalkin, Zinovy
dc.date2007-03-08
dc.date.accessioned2026-07-07T12:53:42Z
dc.date.available2026-07-07T12:53:42Z
dc.descriptionA new international Pilot Project for the re-determination of the ICRF was initiated by the International VLBI Service for Geodesy and Astrometry (IVS) in January 2005. The purpose of this project is to compare the individual CRF solutions and to analyze their systematic and random errors with focus on the selection of the optimal strategy for the next ICRF realization. Eight radio source catalogues provided by the IVS Analysis Centers GA, SHAO, DGFI, GIUB-BKG, JPL, MAO NANU, GSFC, USNO were analyzed. In present study, four analytical models were used to investigate the systematic differences between solutions: solid rotation, rotation and deformation (IERS method), and expansion in orthogonal functions: Legendre-Fourier polynomials and spherical functions. It was found that expansions by orthogonal function describe the differences between individual catalogues better than the two former models. Finally, the combined CRF was generated. Using the radio source positions from this combined catalogue for estimation of EOP has shown improvement of the uncertainty of the celestial pole offset time series.
dc.description9 pages, 8 figures. Presented at the XXVIth IAU General Assembly, JD16, Prague, Czech Republic, 14-25 August 2006
dc.identifierhttps://arxiv.org/abs/astro-ph/0703194
dc.identifierhttp://arxiv.org/abs/astro-ph/0703194
dc.identifierAstron. Astrophys.474:665-670,2007
dc.identifierdoi:10.1051/0004-6361:20077450
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223709
dc.subjectAstrophysics
dc.titleSystematic errors and combination of individual CRF solutions in the framework of the international pilot project for the next ICRF
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