US 9,753,131 B2 · Motion tracking via body radio reflections

Abstract

A motion tracking system makes use of a number antennas to transmit and receive radio frequency signals that are reflected from objects (e.g., people) in the environment of the system, which may include one or more rooms of a building, the interior of a vehicle, etc., and may be partitioned, for example, walls or cloth sheets. In general, the objects in the environment include both fixed objects, such as chairs, walls, etc., as well as moving objects, such as but not limited to people. The system can track people, who may be moving around a room, or may be relatively stationary, for instance, sitting in a chair of lying in bed, but may nevertheless exhibit breathing motion that may be detected. The system may detect body or limb gestures made by the people in the environment, and detect physical activity including detection of falls.

Claims44

Dependent claims

A method for indoor localization using signal reflections from a moving body, the method comprising:

emitting a transmitted signal comprising repetitions of a transmitted signal pattern from a transmitting antenna;
receiving, at each receiving antenna of a set of receiving antennas, a received signal comprising reflections of the transmitted signal;
for each received signal,
processing the received signal to form successive patterns of reflections of the transmitting signal pattern from moving bodies, and
processing the successive patterns of reflections including retaining effects of direct reflections from said moving body and excluding at least some effects of multipath reflections from said moving body that are also reflected from at least one static object;
and
determining a location of the body using a result of processing the successive patterns of reflections.

4 more elements

Dependencies are inferred from the claim text.

Motion tracking via body radio reflections

Life of this patent

Motion tracking via body radio reflections

Life of this patent

Abstract

Claims44