Abstract
Mobile-GPS is generally used for pedestrian positioning on mobile devices such as mobile phones and PDAs. However mobile-GPS can cause approximately 100-meter error by serious influences such as "multipath" in urban areas. When the present location plot is far away from approximately 100-meter on the map, Mobile-GPS may give the pedestrian serious confusion. In this paper, we propose an improved pedestrian positioning system using mobile-GPS, road traffic signs and landmarks based on current location recognition. At first, our system determines the position of the road traffic signs using the road traffic signs and a landmark which the pedestrian finds in the real world. Secondly, our system displays the position of the road traffic signs and the landmark on the map. Then, the pedestrian recognize the present location easily on the map because the real world corresponds to the map on which the road traffic sign and landmark are displayed. Our system assumes the same road traffic signs in a small area to be one cluster and partitions urban areas into high-rise building areas and others. The system usability is improved based on the original system by selecting a road traffic sign only twice in high-rise building areas and only once in other areas in urban area. Finally, we confirm effectiveness of the improved system through simulation investigation.
