Global Positioning System (GPS) is a highly demanded tool for positioning and synchronization of measurements; therefore, assessing the accuracy of a GPS receiver is an essential phase of any field survey. The main goal of this study is to briefly summarize different commonly used GPS accuracy measures and then compare the horizontal and vertical accuracies of GPS and differential GPS (DGPS) by taking instant measurements, instead of making measurements for long periods of time at sampling locations. To achieve this, a field study was carried out at Middle East Technical University (METU) campus in Ankara, Turkey. As a preliminary step before the field study, a basic sampling strategy was developed. The horizontal and vertical accuracies of both receivers were calculated and given in terms of root-mean-square error (RMSE) and arithmetic mean of error. The results revealed out that DGPS has significantly better performance than GPS, when horizontal and vertical accuracies are considered.
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Kuter et al. (2010) studied this question.