The International Terrestrial Reference System , Galileo and other Global Navigation Satellite Systems
Boucher, C.¹; Arias, F.²; Bessero, G.³; Capitaine, N.⁴; Guinot, B.⁵; Kovalevsky, J.⁶; Le Mouel, J.-L.⁷; Willis, P.^8
1CGPC; ²BIPM; ³SHOM; ⁴Observatoire de Paris; ⁵BDL; ⁶Observatoire de la Cote d'Azur; ⁷IPG Paris; ⁸IGN/IPG Paris

The French Bureau des Longitudes (BDL) has recently undertaken an investigation about various issues related to Terrestrial Reference Systems and Frames, and specifically about endorsing and promoting the International Terrestrial Reference System (ITRS) as unique preferred system in any activity, scientific or applied.

One point of particular importance is the clarification of terminology and understanding between ITRS and WGS84.

An other point of particular interest for this Meeting is the relations between ITRS and GNSS, and specifically Galileo. For instance, ITRS is explicitely mentionned in the USA-EU agreement.

These questions were already raised in the book on Galileo , jointly written by the BDL, the French Academy of Marine and the Academie Nationale de l'Air et de l'Espace (ANAE), of which a new edition in english is about to be published with the support of ESA.

This presentation iis an updated view of the BDL, thanks to its ad hoc working group on this topic.