Outdoor Localization of a WiFi Source With Unknown Transmission Power

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Executive Summary

One threat to the reliability of GNSS systems is RF interference. One possibility for localising interference sources is to take received signal strength (RSS) measurements. To explore this scenario a sensor network is created in a 140m2 outdoor environment using a number of Wi-Fi stations that can measure the received signal strength of a Wi-Fi access point. The log-normal path-loss model is used to relate the RSS value to distance. Although methods that create a radio-map of an environment through a survey give good performance it may not be practical to conduct such a survey in all locations for a large outdoor environment. As an alternative the path-loss exponent of the propagation environment can be estimated along with position and transmission power.

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