RF-Based Micro-Motion Tracking for Gesture Tracking and Recognition

摘要

This document describes techniques for radio frequency (RF) based micro-motion tracking. These techniques enable even millimeter-scale hand motions to be tracked. To do so, radar signals are used from radar systems that, with conventional techniques, would only permit resolutions of a centimeter or more.

主权项

1. A computer-implemented method comprising:
receiving a radar signal representing a superposition of reflections of two or more points of a hand within a radar field provided by a radar system, a first of the two or more points having a first movement and a second of the two or more points having a second movement; determining a velocity profile of the radar signal, the velocity profile indicating energies at multiple velocities, a first of the energies representing a reflection of the first point having the first movement and a second of the energies representing a reflection of the second point having the second movement; extracting, from the velocity profile and one or more prior-determined or later-determined velocity profiles over time, relative velocities between the first and second points of the hand; and determining a displacement trajectory by integrating the relative velocities, the displacement trajectory representing a relative displacement between the first and second points of the hand.