Infrastructure-free Floor Localization via Mobile Phone Sensing

Tuesday, 10th July 2012, 10:00 am (PDCC Meeting Room)
Speaker: Dr. Tao Gu (South Denmark University, Denmark)
Title: Infrastructure-free Floor Localization via Mobile Phone Sensing

Mobile phone localization plays a key role in the fast-growing Location Based Applications domain. Most of the existing localization schemes rely on infrastructure support such as GSM, WiFi or GPS. In this talk, I will present our recent work on floor localization via mobile phone sensing, named FTrack. FTrack uses the mobile phone's accelerometer only without any infrastructure support. It does not require any prior knowledge of the building such as floor height. By capturing user encounters and analyzing user trails, FTrack finds the mapping from the traveling time (when taking the elevator) or the step counts (when walking on the stairs) between any two floors to the number of floor levels. The mapping can then be used for mobile users to pinpoint their current floor levels. We conduct both simulation and field studies to demonstrate the effectiveness of FTrack. Our field trial in a 10-floor building shows that FTrack achieves an accuracy of over 90% after two hours in our experiment.


Dr. Tao Gu is an Assistant Professor in the Department of Mathematics and Computer Science at University of Southern Denmark. His current research interests include mobile and pervasive computing, wireless sensor networks, and distributed network systems. His publications appear in journals such as JSAC, TMC, TPDS, and TKDE) and conferences such as INFOCOM, PerCom, and UbiComp. He serves as TPC members for many conferences including INFOCOM, PerCom, etc. He is also the TPC chair for MobiQuitous 2011, and an Associate Editor for Elsevier Journal of Pervasive and Mobile Computing (PMC). He is a member of the IEEE and the ACM.