Significant progresses have been made in the Global Positioning System (GPS) receiver technology in the recent years. Unfortunately, Multipath remains as an unsolved problem for high precision applications. In order to design a GPS receiver thatis capable of multipath suppression or compensation, a fully understanding of the multipath is necessary. A comprehensive multipath simulation tool is thus important for GPS receiver developers that intend to incorporate effective multipath mitigationtechniques. A GPS multipath simulation tool based on the electromagnetic modeling technique-the Uniform Geometrical Theory of Diffraction (UTD) is proposed for the International Space Station (ISS) Program. It is demonstrated that the GPS carrier phaseerrors due to multipath can be simulated and predicted using the electromagnetic modeling technique such as the UTD.
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