Abstract
In buildings featuring marble flooring, glass display cases, and complex architecture, radio-frequency (RF) multipath propagation causes signals to bounce, confusing traditional localization systems. In a museum, visitors using proximity-based indoor audio guides can thereby experience back-and-forth jumping of the audio track between adjacent exhibits. This disclosure describes deterministic, multimodal logic and techniques for state switching in location-based services (LBS). The techniques leverage the observation that multipath reflections mimic phase distortions characteristic of man-in-the-middle attacks to use the normalized attack detector metric (NADM) as an environmental proxy. The raw NADM is evaluated on a sliding scale, and, if the score is high (indicating phase distortion), a multipath reflection off marble/glass is assumed and the audio trigger is suppressed. This ensures that only direct line-of-sight (LOS) signals authorize state changes. By fusing channel sounding, inertial measurement unit kinematics, and repurposed cryptographic metrics, the described techniques reduce or eliminate proximity glitching in reflective environments to deliver deterministic proximity audio and improved battery efficiency.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Barash, Alon, "Multipath Mitigation and State Management in Location-Based Services using Sensor Fusion and Repurposed Cryptographic Metrics", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/10134