Earth rotation parmeters determined over CONT08 VLBI campaign by the GRGS from the combination of the space geodetic techniques

International audienceA IERS Working Group on Combination at the Observation Level(COL-WG) was set up in the course of 2009 [http://www.iers.org/IERS/EN/Organization/WorkingGroups/]. Its main objective is to enhance techniques at the observation level. The period relative to the continuous VLBI campaign CONT08 extending from 10 to 30th August 2008 was selected to inter compare multi-technique combinations. We present the first analyzes