GPS Positioning with Multipath Detection and Rectification Using 3D Maps

Abstract

Global Navigation Satellite Systems (GNSSs) suffers from multipath effect in urban canyons. Many approaches have been employed to eliminate multipath signals in order to reduce positioning errors. Among these, ideas that consider surrounding buildings to evaluate possible multipath have gained most interest. However, such approaches, although successful, require many satellites after eliminating multipath signals. This study proposes an approach in which the multipaths themselves are used for positioning error correction. The proposed algorithm evaluates the pseudoranges of the possible multipath signals by referring to the building geometry. The proposed method was verified through field experiments in urban canyons in Tokyo.