Mobility

Improved Estimation of Trilateration Distances for Indoor Wireless Intrusion Detection

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Executive Summary

Detecting wireless network intruders is challenging since logical addressing information may be spoofed and the attacker may be located anywhere within radio range. Accurate indoor geo-location provides a method by which the physical location of rogue wireless devices may be pinpointed whilst providing an additional option for location-based access control. Existing methods for geo-location using Received Signal Strength (RSS) are imprecise, due to the multipath nature of indoor radio propagation and additional path-loss due to walls, and aim to minimise location estimate error. This paper presents an approach to indoor geo-location that improves measurements of RSS by averaging across multiple frequency channels and determining the occurrence of walls in the signal path.

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