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Authors: Colosimo, G.* 
Crespi, M.* 
Mazzoni, A.* 
Jones, M.* 
Missiaen, D.* 
Riguzzi, F.* 
Title: Determination of the CNGS global geodesy
Issue Date: 14-Apr-2012
Series/Report no.: OPERA public note
132 v.3
Keywords: LNGS
Subject Classification05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous 
Abstract: This paper describes the activities carried out in order to estimate the distance traveled by the neutrinos beam between CERN and LNGS with an accuracy better than 1 meter. In particular, the distance between two fundamental points has been estimated: the start point at CERN (de ned as T-40-S-CERN) and the OPERA detector point (de ned as A1-9999). The measurements campaings, at CERN and at LNGS, were performed using both terrestrial and Global Positioning System (GPS) based geodetic techniques. The positions of the two fundamental points were estimated in a common reference frame through the processing of the collected observations. The resulting distance (730534.610 m) was estimated with an accuracy at the level of 20 cm, remarkably better than the stated limit.
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