MacMillan DS, Ma C (1997) Atmospheric gradients and the VLBI terrestrial and celestial reference frames. Ma C, Arias EF, Eubanks TM, Fey AL, Gontier A-M, Jacobs CS, Sovers OJ, Archinal BA, Charlot P (1998) The international celestial reference frame as realized by very long baseline interferometry. Li J, Wang G (2000) Global solution of VLBI observations and assessments. Lambert S, Barache C (2013) OPA2013a solution. Frankfurt am Main: Verlag des Bundesamts für Kartographie und Geodäsie, p 137. Gontier A-M, Arias EF, Barache C (2006) Maintenance of the ICRF using teh most stable sources.
In: IVS 2010 general meeting proceedings, pp 90–94 Gipson J, Behrend D, Gordon D, Himwich E, MacMillan D, Titus M, Corey B (2010) Coordinating, scheduling, processing and analyzing IYA09. Frankfurt am Main: Verlag des Bundesamts für Kartographie und Geodäsie, p 204. Presented on behalf of the IERS/IVS working group (IERS Technical Note No. doi: 10.1051/0004-6361:20030348įey AL, Gordon D, Jacobs CS (eds) (2009) The second realization of the international celestial reference frame by very long baseline interferometry. doi: 10.1007/978-8-1_126įeissel-Vernier M (2003) Selecting stable extragalactic compact radio sources from the permanent astrogeodetic VLBI program. (eds) Geodesy for planet earth, international association of geodesy symposia 136.
Datum definition software#
doi: 10.1007/s0019-7īöhm J, Böhm S, Nilsson T, Pany A, Plank L, Spicakova H, Teke K, Schuh H (2012) The new vienna VLBI software VieVS. īöckmann S, Artz T, Nothnagel A (2010) VLBI terrestrial reference frame contributions to ITRF2008. International celestial reference frame (ICRF)īizouard C, Gambis D (2011) The combined solution C04 for Earth orientation parameters consistent with international terrestrial reference frame 2008.Geodetic very long baseline interferometry (VLBI).ICRF2 could be improved if more defining sources, especially in the southern hemisphere, were considered.
Comparing with a typical VLBI session, the precision of the EOP and the agreement of the axes w.r.t. The analysis shows that the smallest uncertainties for EOP are achieved when the maximum number of defining sources is chosen for the datum.
Datum definition series#
The resulting EOP of the special VLBI session IYA09 are compared to the C04 08 EOP series (Bizouard and Gambis, The combined solution C04 for Earth orientation parameters consistent with international terrestrial reference frame 2008, IERS Notice 2011,, 2011). 35), Frankfurt am Main: Verlag des Bundesamts für Kartographie und Geodäsie, p 204, ISBN 3-89888-918-6, 2009). In this study we analyze the effects of different options for the celestial datum definition on the precision of the EOP and on the agreement w.r.t the last realization of the International Celestial Reference Frame (ICRF2 Fey et al., The second realization of the international celestial reference frame by very long baseline interferometry, Presented on behalf of the IERS/IVS working group (IERS Technical Note No. How many and which radio sources are taken into account for the datum definition has a significant effect on the estimated EOP. When estimating a Celestial Reference Frame (CRF) usually a number of radio sources with a long history of observations and stable positions are included in the datum used to define the orientation of the frame. Earth Orientation Parameters (EOP) provide the rotation of the International Terrestrial Reference System (ITRS) to the Geocentric Celestial Reference System (GCRS) as a function of time.
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