Comparison of different GPS positioning methods used in gravity survey by FGI in 2002

摘要

Finnish Geodetic Institute (FGI) has used GPS positioning in gravity network densification survey since 1996. Locations of gravity stations have been determined with a combination of GPS positioning and digital geoid model. Mean accuracy in height determination has been mainly within 10-30 cm compared to the levelled heights. In the survey of 2002 the aim was to find more accurate and effective positioning method. Therefore some practical GPS positioning methods e.g. real-time kinematic (RTK), static surveying, post-process RTK and virtual reference station (VRS) were tested.