Dynamic fine-grained localization in Ad-Hoc networks of sensors
Proceedings of the 7th annual international conference on Mobile computing and networking
Data Fusion of Power and Time Measurements for Mobile Terminal Location
IEEE Transactions on Mobile Computing
Power matching approach for GPS coverage extension
IEEE Transactions on Intelligent Transportation Systems
Survey of Wireless Indoor Positioning Techniques and Systems
IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews
Privacy-preserving data-oblivious geometric algorithms for geographic data
Proceedings of the 18th SIGSPATIAL International Conference on Advances in Geographic Information Systems
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One of the important issues in wireless localization is concerned with the identification of non-line-of-sight (NLOS) radio signal propagation, since NLOS propagation is considered the dominant source of localization error. The existing identification methods focus on "consistency" tests, based on the assumption that localization involving the use of NLOS radio signals cannot be performed in a consistent manner. However, the validity of the foregoing assumption has not been properly investigated. This paper presents a theoretical analysis of the localization using NLOS radio signals, and shows that the assumption would no longer be valid when the mobile user is located outside the convex hull of the underlying beacons. As a result, existing NLOS identification methods, as well as many localization approaches, could perform unsatisfactorily. The importance of the proposed convex hull condition for NLOS identification is confirmed by extensive simulation results.