June 29, 2009 (v1)
Conference paper
A new version of ITRF (ITRF2008) is planned and requests combination of the various astro-geodetic techniques over a period of several years. In the framework of the « Groupe de Recherches de Géodésie Spatiale » GRGS, we are combining normal equations derived from the processing of 4 techniques on a regular basis (GPS, VLBI, SLR and DORIS)....
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