STUDY ON IMPROVEMENT EFFECT OF VERTICAL ACCURACY OF GPS CARRIER PHASE POSITIONING USING QZSS

Abstract

 Ministry of Land, Infrastructure, Transport and Tourism announced i-Construction aimed at increasing productivity in the infrastructure maintenance in 2015 by introducing 3-dimensional data using satellite positioning. The accuracy of the satellite positioning system is high in the horizontal direction, however, low in the vertical direction. The purpose of this study is to compare the vertical accuracy by GPS and QZSS to the vertical accuracy by GPS alone. As the results, it was shown that QZSS contributed to keep high vertical accuracy for long time when the elevation angle was more than 80 degrees.