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3D Tracking via Body Radio Reflections

Authors: 

Fadel Adib, Zach Kabelac, Dina Katabi, and Robert C. Miller, Massachusetts Institute of Technology

Abstract: 

This paper introduces WiTrack, a system that tracks the 3D motion of a user from the radio signals reflected off her body. It works even if the person is occluded from the WiTrack device or in a different room.WiTrack does not require the user to carry any wireless device, yet its accuracy exceeds current RF localization systems, which require the user to hold a transceiver. Empirical measurements with a WiTrack prototype show that, on average, it localizes the center of a human body to within a median of 10 to 13 cm in the x and y dimensions, and 21 cm in the z dimension. It also provides coarse tracking of body parts, identifying the direction of a pointing hand with a median of 11.2°. WiTrack bridges a gap between RF-based localization systems which locate a user through walls and occlusions, and human-computer interaction systems like Kinect, which can track a user without instrumenting her body, but require the user to stay within the direct line of sight of the device.

Fadel Adib, Massachusetts Institute of Technology

Zach Kabelac, Massachusetts Institute of Technology

Dina Katabi, Massachusetts Institute of Technology

Robert C. Miller, Massachusetts Institute of Technology

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