Robust WiFi Time-of-Flight Positioning System

Abstract

Reusing commercial off-the-shelf (COTS) WiFi access points (AP) for location-based services is an attractive and cost-effective approach to provide the much-needed positioning information in those scenarios where GPS fails. Classical solutions for WiFi-based positioning are based on signalstrength measurements [1]. Relying on signal-strength measurements has well-known limitations, such as the high dependency of the signal propagation with respect to the material of the obstacles between radio devices like walls, doors, etc.