Research about GNSS Spoofing Detection by Multipath Monitoring

Abstract

GNSS (Global Navigation Satellite System) spoofing is one of the threats to GNSS users include airplane or UAV (Unmanned Aerial Vehicle). It can generate mock GNSS signal and broadcast it, and GNSS user is confused by fake position, velocity and timing information given by attacked GNSS receiver. We researched GNSS spoofing risk and proposed a detection method by monitoring multipath. Multipath caused by spoofing signal achieves to GNSS antenna through same path for all satellites signals and we focused on this similarity among the multipath. Multipath signal parameters are estimated using dual polarization antenna and dual channel SDR (Software Defined Radio) GNSS receiver and then we distinguished spoofing signal by clustering algorithm. Our proposed methods are evaluated on sea environment and we succeeded to detect spoofing with low false detection rate and miss detection rate.