Relative localization in 802.11/GPS systems

In the recent years, there has been an increasing need to capture positioning informations, basically based on GPS systems. The informations retrieved by these satellite systems may be not always available in specific scenarios like indoor areas, tree-covered zones or urban canyons. On the other hand, thanks to the technical advances in wireless networking, low cost 802.11 Wi-Fi networks can be exploited to positioning un-located Wi-Fi terminals by exploiting the presence of located Wi-Fi terminals - GPS based - and the communication capabilities of all the Wi-Fi terminals. In this contribution we will duly define this scenario, and the related directions of work, with a particular focus on location-oriented 802.11 measurement methodologies.