IVS contribution to ITRF2008: preliminary analysis

X. Collilieux1, Z. Altamimi1

1LAREG, IGN, France

Oral presentation 

	The next release of the International Terrestrial Reference Frame, the ITRF2008, will be formed by homogeneously reprocessed solutions provided by the four international technique services contributing to the IERS activities. This paper will focus on the International VLBI Service (IVS) contribution to the ITRF2008. 	Preliminary analysis related to the frame specification and its defining parameters will be presented, especially the scale factor and its temporal behaviour. In order to study the inter-technique agreement and to attempt to quantify the future combined frame quality, the non-linear part of the VLBI position time series variations will be compared to the GPS homogeneously reprocessed solution at co-location sites. The results of this study will be confronted to those obtained at the time of ITRF2005 analysis.