Assessment and Comparison of Accuracies of Three Differential Global Positioning System (DGPS) Data Processing Software
Bala, M. G; Edan J. D; Mohammed A.

Abstract
The research investigates the capability and accuracy of three different instruments software used in processing Differential Global Positioning System (DGPS) data. To examine this task, a reference network comprising of 20 control points was established using static mode observations. The data were collected using Promark3 DGPS and were processed using the three different software namely Ashtech Office Suite (AOS), Trimble Business Center (TBC) and Hi-target Geomatics Office (HGO). Statistical analyses did not show any significant difference between the three processing software. The three software were further evaluated and analyzed graphically using Error ellipse. The results indicated that HGO has the least uncertainty of 16.2632% average value of the axis, but it fails to process one of the points (MG12). TBC software had the second uncertainty average value of the axis of 16.3158%. The third software, AOS yielded 67.4210% uncertainty average value of the axis. TBC and HGO were therefore revealed to have the same precision, but HGO has limitation in terms of antenna selection. In DGPS surveys, TBC software is therefore recommended for processing data observed by any GPS receiver.

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