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La station de base compare la position calculée à partir du signal GPS et la position réelle, PDF-ENSG GNSS - Systèmes Globaux de Positionnement.SUMMARY The paper discusses surveying by means of RTK-GPS positioning techniques in construction work with emphasis on using a single GPS receiver. RTK GPS (Real Time Kinematic GPS) surveying method has some advantages over classical geodetic surveying methods in that RTK GPS does not need sight between