Study on the Method of Accuracy Improvement for High Precision Satellite-based Positioning System using Geospatial Data

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The number of satellites has been increased and has become excessive for positioning by insatllation of satellites such as GPS, GLONASS, QZSS and Galileo. It is assumed that the positioning accuracy will decline when the receiver receives the satellite radio wave containing the large amount of error due to the multipath and delay of propagation. In order to predict the range error of each satellite signal on the observation point, the detection method of multipath has been investigated theoretically and empirically using the relationship of location of observation point, surrounding obstacles and each satellite. As a result, the method to select the satellite for positioning calculation has been developed by excluding the satellite wave containing multipath and by considering the geometrical combination of satellites.