Research in Sensor Networks Using Device-Free LocalizationDevice-free localization (DFL) involves determining where someone is without needing to attach a device to the person. We use a wireless network of sensor nodes that transmit and receive RF signals, and exploit the fact that the human body affects the RF wave field.
When a person is present, the nodes detect variances in the signals sent from other nodes. By processing this data with the appropriate algorithms, it's possible to determine where someone is.
Current research into DFL at the University of Utah is being conducted in the SPAN lab, under the direction of Dr. Neal Patwari. My undergraduate thesis involved using a wireless sensor network of RF sensor nodes to determine if someone has fallen, while my master's thesis concentrated on maintaining accuracy of DFL systems in changing environments. This site provides information about my research.