Research in Sensor Networks Using Device-Free Localization

Device-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.

Three D RTI

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.

My Research

Information about my undergrad research on fall detection using wireless sensor networks, and my master's thesis on DFL in changing environments.


Fall detection is just one of the possible applications for device-free localization. Here are a few more ways of putting this kind of wireless sensor network to use.


Interactive demonstration of how one can use a wireless sensor network for detecting intruders. Requires Javascript to be turned on in your browser.