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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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