Motion tracking via body radio reflections
First Claim
1. 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, andprocessing 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.
2 Assignments
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Accused Products
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.
31 Citations
44 Claims
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1. A method for indoor localization using signal reflections from a moving body, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for interaction with a device using gestures made by a person comprising:
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tracking a motion of a body, including emitting a radio frequency 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, tracking the location using successive reflections of the transmitted signal pattern; detecting a pattern of motion using the tracked motion of the body; using the detected pattern of motion to interact with the device. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for detecting fall of a person comprising:
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tracking a motion of the person, including emitting a radio frequency 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, tracking the location using successive reflections of the transmitted signal pattern; detecting a pattern of motion using the tracked motion of the body; using the detected pattern of motion to detect a fall of the person. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. A system comprising:
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a transmitting antenna and a set of receiving antenna; a transmitter coupled to the transmitting antenna and configured to generate a transmitting signal comprising repetitions of a transmitting signal pattern; a receiver coupled to the set of receiving antennas, for receiving signals comprising reflections of the transmitting signal; a processor coupled to the transmitter and to the receiver, configured to cause the system to emit a transmitted signal comprising repetitions of a transmitted signal pattern from a transmitting antenna; receive, at each receiving antenna of a set of receiving antennas, a received signal comprising reflections of the transmitted signal; for each received signal, process the received signal to form successive patterns of reflections of the transmitting signal pattern from moving bodies, and process 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 determine a location of the body using a result of processing the successive patterns of reflections.
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Specification