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Abstract

The objective of this paper is to present a comparison between three of GPS commercial software packages, namely Trimble Business Center TBC, Leica Geo Office LGO, and Topcon Magnet MGT, for processing GPS static baselines up to 30 km. The study was based on statistical analysis of the discrepancies between every two software packages for the output of baseline vectors in Easting, Northing, and Ellipsoidal height, for 14 GPS static baselines ranging from 2 to 30 km, where these baselines were processed using TBC, LGO, and MGT. The results supported by statistical analysis showed that the 3d positional discrepancies dP3d between TBC and MGT has a mean value of 31 mm and 8 mm standard deviation; while the 3d positional discrepancy between TBC and LGO has a mean value of 25 mm with 6 mm standard deviation; finally the 3d positional discrepancy between MGT and LGO software has a mean value of 31 mm with 9 mm standard deviation. These findings are about 3 ppm in the 3d positional discrepancy, which can be considered insignificant in the daily GPS topographic survey works. However, in case of monitoring activities using GPS static technique, it is recommended to use the same GPS software to process the static data to overcome any discrepancies due to using more than one GPS software.