Browsing by Subject "GPS anti-spoofing"
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Item An Evaluation of the Vestigial Signal Defense for Civil GPS Anti-Spoofing(2011) Wesson, Kyle D.; Shepard, Daniel P.; Bhatti, Jahshan A.; Humphreys, Todd E.A receiver-autonomous non-cryptographic civil GPS antispoofing technique called the vestigial signal defense (VSD) is defined and evaluated. This technique monitors distortions in the complex correlation domain to detect spoofing attacks. Multipath and spoofing interference models are developed to illustrate the challenge of distinguishing the two phenomena in the VSD. A campaign to collect spoofing and multipath data is described, which specific candidate VSD techniques can be tested against. Test results indicate that the presence of multipath complicated the setting of an appropriate spoofing detection threshold.Item A Proposed Navigation Message Authentication Implementation for Civil GPS Anti-Spoofing(2011) Wesson, Kyle D.; Rothlisberger, Mark P.; Humphreys, Todd E.A specific implementation of navigation message authentication (NMA) for civil GPS anti-spoofing is proposed. The notion of GNSS signal authentication is defined in probabilistic terms. This work proposes a practical, backwardcompatible NMA strategy for the civil L2/L5 civil navigation (CNAV) message. The proposal is sufficiently detailed to facilitate near-term implementation of securityhardened civil GPS.