Indoor location estimation using multiple wireless technologies

.Abrrrurr-Future mobile devices will increasingly have multi,ple sources of location information associated with them, such as GPS. cellular ~ell-s~ctor ID. Bluetooth or 802.11 wireless LAN. I n fdct. cellular phones with GPS receivers and 802.11 wireless LAN are already becoming available. However, not all location technologies will operate e\,erywhere (e.g. GPS typically will not \wrk indoors whereas 802.11 coverage may be available) and they typically have different accuracies and range. This paper presents an experimental study of the feasibility 01 using multiple wireless technologies simultaneously for location We have collected signal strength information from 802.1 1 and Bluetooth wireless network technologies, developed and applied algorithms for determining location using data fur each wireless technology. and then used a simple algorithm far fusing t h e location estimates from both technologies to try to enhance the accuracy of the location estimates.