Motion localization in a wireless mesh network based on motion indicator values

• US 10,109,167 B1
• Filed: 10/20/2017
• Issued: 10/23/2018
• Est. Priority Date: 10/20/2017
• Status: Active Grant

• Current Assignee: Cognitive Systems Corp.
• Original Assignee: Cognitive Systems Corp.
• Inventors: Olekas, Christopher Vytautas, Griesdorf, Dustin
• Primary Examiner(s): Tun, Nay
• Application Number:
  US15/789,761
• Time in Patent Office: 368 Days
• CPC Class Codes: G01S 13/003 Bistatic radar systems; Multistatic radar systems
• CPC Class Codes: G01S 13/56 for presence detection presence detection using near field arrangements G01V3/00, e.g. G01V3/08, G01V3/12; burglar, theft or intruder alarms with electrical actuation G08B13/22 - G08B13/26
• CPC Class Codes: G01S 7/006 using shared front-end circuitry, e.g. antennas G01S13/765, G01S13/825 take precedence
• CPC Class Codes: G01S 7/415 Identification of targets based on measurements of movement associated with the target
• CPC Class Codes: G08B 13/24 by interference with electromagnetic field distribution
• CPC Class Codes: G08B 13/2491 Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/20 Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

In a general aspect, a location of detected motion in a space is determined. In some aspects, motion of an object in a space is detected based on wireless signals communicated through the space by a wireless communication system that includes multiple wireless communication devices. Each wireless signal is transmitted and received by a respective pair of the wireless communication devices. Motion indicator values are computed for the respective wireless communication devices. The motion indicator value for each individual wireless communication device represents a degree of motion detected by the individual wireless communication device based on a subset of the wireless signals transmitted or received by the individual wireless communication device. A location of the detected motion in the space is determined based on the motion indicator values.

Claims

1. A motion detection method comprising:

detecting motion of an object in a space based on wireless signals communicated through the space by a wireless communication system comprising multiple wireless communication devices, each wireless signal being transmitted and received by a respective pair of the wireless communication devices on receipt of a beacon wireless signal transmitted by a hub device;

by operation of one or more processors, computing motion indicator values for the respective wireless communication devices, the motion indicator value for each individual wireless communication device representing a degree of motion detected by the individual wireless communication device based on a subset of the wireless signals transmitted or received by the individual wireless communication device; and

determining a location of the detected motion in the space based on the motion indicator values received in response to the beacon wireless signal.

2. The method of claim 1, wherein the wireless communication system comprises the hub device and remote sensor devices, wherein the hub device receives motion indicator values from the remote sensor devices and determines the location of the detected motion based on the received motion indicator values.

3. The method of claim 1, wherein the motion indicator values are aggregate motion indicator values, and the method comprises:

obtaining link motion indicator values for respective communication links in the wireless communication system, each communication link provided by a respective pair of the wireless communication devices; and

computing the aggregate motion indicator value for each wireless communication device based on the link motion indicator values for the subset of the communication links supported by the wireless communication device.

4. The method of claim 3, wherein computing the aggregate motion indicator value for a wireless communication device comprises weighting the link motion indicator values for the subset of communication links based on signal quality metrics for the respective communication links.

5. The method of claim 1, wherein:

the wireless communication system comprises a plurality of communication links, each communication link provided by a respective pair of the wireless communication devices, each communication link comprising multiple communication paths, each communication path between a first signal hardware path of a first wireless communication device of the pair and a second signal hardware path of a second wireless communication device of the pair;

the motion indicator values are aggregate motion indicator values; and

the method comprises;

obtaining path motion indicator values for respective communication paths in the wireless communication system; and

computing the aggregate motion indicator value for each wireless communication device based on the path motion indicator values for the subset of the communication paths supported by the wireless communication device.

6. The method of claim 1, comprising computing, for each wireless communication device, a confidence factor based on scaling the motion indicator value for the wireless communication device by a normative motion indicator value for the wireless communication devices, wherein the location of the detected motion is determined based on the confidence factors.

7. The method of claim 1, wherein determining the location of the detected motion in the space comprises determining which of the wireless communication devices is nearest the detected motion based on comparing the respective motion indicator values for the wireless communication devices.

8. The method of claim 1, wherein the location of the detected motion in the space is determined based on signal quality metrics for respective communication links in the wireless communication system, each communication link provided by a respective pair of the wireless communication devices.

9. The method of claim 8, wherein determining the location of the detected motion in the space comprises combining signal quality metrics for the subset of communication links supported by each wireless communication device.

10. The method of claim 1, comprising providing the motion indicator values as inputs to a neural network;

and determining the location of the detected motion based on an output of the neural network.

11. A non-transitory computer-readable storage medium storing instructions that are operable when executed by a data processing apparatus to perform operations comprising:

detecting motion of an object in a space based on wireless signals communicated through the space by a wireless communication system comprising multiple wireless communication devices, each wireless signal being transmitted and received by a respective pair of the wireless communication devices on receipt of a beacon wireless signal transmitted by a hub device;

computing motion indicator values for the respective wireless communication devices, the motion indicator value for each individual wireless communication device representing a degree of motion detected by the individual wireless communication device based on a subset of the wireless signals transmitted or received by the individual wireless communication device; and

determining a location of the detected motion in the space based on the motion indicator values received in response to the beacon wireless signal.

12. The non-transitory computer-readable storage medium of claim 11, wherein the wireless communication system comprises the hub device and remote sensor devices, wherein the hub device receives motion indicator values from the remote sensor devices and determines the location of the detected motion based on the received motion indicator values.

13. The non-transitory computer-readable storage medium of claim 11, wherein the motion indicator values are aggregate motion indicator values, and the operations comprise:

obtaining link motion indicator values for respective communication links in the wireless communication system, each communication link provided by a respective pair of the wireless communication devices; and

computing the aggregate motion indicator value for each wireless communication device based on the link motion indicator values for the subset of the communication links supported by the wireless communication device.

14. The non-transitory computer-readable storage medium of claim 13, wherein computing the aggregate motion indicator value for a wireless communication device comprises weighting the link motion indicator values for the subset of communication links based on signal quality metrics for the respective communication links.

15. The non-transitory computer-readable storage medium of claim 11, wherein:

the wireless communication system comprises a plurality of communication links, each communication link provided by a respective pair of the wireless communication devices, each communication link comprising multiple communication paths, each communication path between a first signal hardware path of a first wireless communication device of the pair and a second signal hardware path of a second wireless communication device of the pair;

the motion indicator values are aggregate motion indicator values; and

the operations comprise;

obtaining path motion indicator values for respective communication paths in the wireless communication system; and

computing the aggregate motion indicator value for each wireless communication device based on the path motion indicator values for the subset of the communication paths supported by the wireless communication device.

16. The non-transitory computer-readable storage medium of claim 11, comprising computing, for each wireless communication device, a confidence factor based on scaling the motion indicator value for the wireless communication device by a normative motion indicator value for the wireless communication devices, wherein the location of the detected motion is determined based on the confidence factors.

17. The non-transitory computer-readable storage medium of claim 11, wherein determining the location of the detected motion in the space comprises determining which of the wireless communication devices is nearest the detected motion based on comparing the respective motion indicator values for the wireless communication devices.

18. The non-transitory computer-readable storage medium of claim 11, wherein the location of the detected motion in the space is determined based on signal quality metrics for respective communication links in the wireless communication system, each communication link provided by a respective pair of the wireless communication devices.

19. The non-transitory computer-readable storage medium of claim 18, wherein determining the location of the detected motion in the space comprises combining signal quality metrics for the subset of communication links supported by each wireless communication device.

20. The non-transitory computer-readable storage medium of claim 11, wherein the operations comprise providing the motion indicator values as inputs to a neural network;

and determining the location of the detected motion based on an output of the neural network.

21. A motion detection system comprising:

multiple remote sensor devices, each remote sensor device configured to;

detect motion of an object in a space based on wireless signals received from other remote sensor devices; and

determine a motion indicator value representing a degree of motion detected by the remote sensor device based on the wireless signals received by the remote sensor device; and

a hub device communicably coupled to the remote sensor devices and configured to transmit a beacon wireless signal and determine a location of the detected motion in the space based on the motion indicator values received from the respective remote sensor devices in response to the beacon wireless signal.

22. The motion detection system of claim 21, wherein the remote sensor devices and the hub device form a wireless mesh network.

23. The motion detection system of claim 21, wherein the motion indicator values are link motion indicator values for respective communication links between pairs of remote sensor devices, and the hub device is configured to compute an aggregate motion indicator value for each remote sensor device based on the link motion indicator values for the subset of communication links supported by the remote sensor device.

24. The motion detection system of claim 23, wherein the hub device is configured to compute the aggregate motion indicator value for each remote sensor device by weighting the link motion indicator values for the subset of communication links supported by the remote sensor device based on signal quality metrics for the communication links.

25. The motion detection system of claim 21, wherein:

the motion indicator values are path motion indicator values for respective communication paths between a first signal hardware path of a first remote sensor device and a second signal hardware path of a second remote sensor device; and

the hub device is configured to compute the aggregate motion indicator value for each remote sensor device based on the path motion indicator values for the subset of the communication paths supported by the remote sensor device.

26. The motion detection system of claim 21, wherein the hub device is configured to compute, for each remote sensor device, a confidence factor based on scaling the motion indicator values for the remote sensor device by a normative motion indicator value for the wireless communication devices, and determine the location of the detected motion based on the confidence factors.

27. The motion detection system of claim 21, wherein the hub device is configured to determine the location of the detected motion by determining which of the remote sensor devices is nearest the detected motion based on comparing the respective motion indicator values for the remote sensor devices.

28. The motion detection system of claim 21, wherein the hub device is configured to determine the location of the detected motion in the space based on signal quality metrics for respective communication links in the wireless communication system, each communication link provided by a respective pair of the remote sensor devices.

29. The motion detection system of claim 28, wherein the hub device is configured to determine the location of the detected motion in the space by combining signal quality metrics for the subset of communication links supported by each remote sensor device.

30. The motion detection system of claim 21, wherein the hub device is configured to provide the motion indicator values as inputs to a neural network, and determine the location of the detected motion based on an output of the neural network.