Controlling radio states for motion detection

• US 9,989,622 B1
• Filed: 08/22/2017
• Issued: 06/05/2018
• Est. Priority Date: 03/16/2017
• Status: Active Grant

• Current Assignee: Cognitive Systems Corp.
• Original Assignee: Cognitive Systems Corp.
• Inventors: Griesdorf, Dustin, Devison, Stephen Arnold, Olekas, Christopher Vytautas
• Primary Examiner(s): Bythrow, Peter M
• Application Number:
  US15/683,637
• Time in Patent Office: 287 Days
• CPC Class Codes: G01S 11/02 using radio waves G01S19/00 takes precedence
• CPC Class Codes: G01S 13/04 Systems determining presence of a target based on relative movement of target G01S13/56
• 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 13/878 Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector G01S13/874 takes precedence
• CPC Class Codes: G01S 5/017 Detecting state or type of motion
• CPC Class Codes: G01S 5/0273 using multipath or indirect path propagation signals in position determination
• CPC Class Codes: G01S 7/006 using shared front-end circuitry, e.g. antennas G01S13/765, G01S13/825 take precedence
• CPC Class Codes: G01S 7/023 Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36
• CPC Class Codes: G01S 7/34 Gain of receiver varied automatically during pulse-recurrence period, e.g. anti-clutter gain control
• CPC Class Codes: G01S 7/489 Gain of receiver varied automatically during pulse-recurrence period
• CPC Class Codes: G08B 13/2491 Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field

Abstract

In a general aspect, the radio state of a wireless communication device is controlled. In some aspects, a first set of motion detection signals is processed by operation of a radio subsystem of a wireless communication device in a first radio state. An amount of variation in the first set of motion detection signals is determined based on values of a parameter of the motion detection signals. A counter is updated in response to a determination that the variation is greater than a first threshold, and the radio subsystem is changed to a second radio state based on comparing the value of the counter with a second threshold. A motion detection process is executed to detect motion of an object in the space based on a second set of motion detection signals processed by operation of the radio subsystem in the second radio state.

Claims

1. A motion detection method comprising:

processing a first set of motion detection signals by operation of a radio subsystem of a wireless communication device in a first radio state, the motion detection signals based on wireless signals transmitted through a space;

by operation of one or more processors, determining an amount of variation in the first set of motion detection signals based on values of a parameter of the respective motion detection signals;

updating a value of a counter in response to a determination that the amount of variation is greater than a first threshold;

changing the radio subsystem from the first radio state to a second radio state based on a comparison of the value of the counter and a second threshold; and

executing a motion detection process to detect motion of an object in the space based on a second set of motion detection signals processed by operation of the radio subsystem in the second radio state.

2. The method of claim 1, wherein changing the radio subsystem from the first radio state to the second radio state comprises executing a gain state machine.

3. The method of claim 2, wherein executing a gain state machine comprises using an automatic gain control (AGC) loop.

4. The method of claim 1, wherein the motion detection process detects motion of an object in the space based on a subset of the second set of motion detection signals.

5. The method of claim 1, comprising setting the counter to a default value in response to detecting motion based on the second set of motion detection signals.

6. The method of claim 1, wherein determining the amount of variation comprises computing a variance of the parameter of the respective motion detection signals in the first set.

7. The method of claim 1, wherein the parameter comprises a power level of the respective motion detection signals.

8. The method of claim 1, comprising holding modem parameters constant based on the comparison of the value of the counter and a second threshold.

9. The method of claim 1, comprising:

by operation of one or more processors, computing values of a signal quality metric based on the respective motion detection signals in the first set; and

storing the values of the parameter in a database based on a determination that the values of the signal quality metric meet a quality criterion for the motion detection process;

wherein the amount of variation is determined based on the values of the parameter stored in the database.

10. The method of claim 1, wherein the counter comprises a first counter, and the method comprises:

by operation of one or more processors, computing values of a signal quality metric based on the respective motion detection signals in the second set;

updating a value of a second counter in response to a determination that the values of the signal quality metric do not meet a quality criterion for the motion detection process; and

changing the radio subsystem from the second radio state to a third radio state based on a comparison of the value of the second counter and a third threshold.

11. The method of claim 1, wherein changing the radio subsystem from the first radio state to the second radio state comprises modifying one or more modem parameters including a gain setting, an RF filter setting, an RF front end switch setting, a DC offset setting, an IQ compensation setting, digital DC correction setting, a digital gain setting, or a digital filtering setting.

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

processing a first set of motion detection signals by operation of a radio subsystem of a wireless communication device in a first radio state, the motion detection signals based on wireless signals transmitted through a space;

determining an amount of variation in the first set of motion detection signals based on values of a parameter of the respective motion detection signals;

updating a value of a counter in response to a determination that the amount of variation is greater than a first threshold;

changing the radio subsystem from the first radio state to a second radio state based on a comparison of the value of the counter and a second threshold; and

executing a motion detection process to detect motion of an object in the space based on a second set of motion detection signals processed by operation of the radio subsystem in the second radio state.

13. The non-transitory computer-readable medium of claim 12, wherein changing the radio subsystem from the first radio state to the second radio state comprises executing a gain state machine.

14. The non-transitory computer-readable medium of claim 13, wherein executing a gain state machine comprises using an automatic gain control (AGC) loop.

15. The non-transitory computer-readable medium of claim 12, wherein the motion detection process detects motion of an object in the space based on a subset of the second set of motion detection signals.

16. The non-transitory computer-readable medium of claim 12, wherein the operations comprise setting the counter to a default value in response to detecting motion based on the second set of motion detection signals.

17. The non-transitory computer-readable medium of claim 12, wherein determining the amount of variation comprises computing a variance of in the parameter of the respective motion detection signals in the first set.

18. The non-transitory computer-readable medium of claim 12, wherein the parameter comprises a power level of the respective motion detection signals.

19. The non-transitory computer-readable medium of claim 12, wherein the operations comprise holding modem parameters constant based on the comparison of the value of the counter and a second threshold.

20. The non-transitory computer-readable medium of claim 12, wherein the operations comprise:

computing values of a signal quality metric based on the respective motion detection signals in the first set; and

storing the values of the parameter in a database based on a determination that the values of the signal quality metric meet a quality criterion for the motion detection process;

wherein the amount of variation is determined based on the values of the parameter stored in the database.

21. The non-transitory computer-readable medium of claim 12, wherein the counter comprises a first counter, and the operations comprise:

computing values of a signal quality metric based on the respective motion detection signals in the second set;

updating a value of a second counter in response to a determination that the values of the signal quality metric do not meet a quality criterion for the motion detection process; and

changing the radio subsystem from the second radio state to a third radio state based on a comparison of the value of the second counter and a third threshold.

22. The non-transitory computer-readable medium of claim 12, wherein changing the radio subsystem from the first radio state to the second radio state comprises modifying one or more modem parameters including a gain setting, an RF filter setting, an RF front end switch setting, a DC offset setting, an IQ compensation setting, digital DC correction setting, a digital gain setting, or a digital filtering setting.

24. The wireless communication device of claim 22, wherein the instructions are operable to modify the radio state of the radio subsystem by executing a gain state machine.

25. The wireless communication device of claim 24, the gain state machine comprises an automatic gain control (AGC) loop.

26. The wireless communication device of claim 22, wherein the instructions are operable to reset the counter to a default value in response to detecting motion based on the motion detection signals.

27. The wireless communication device of claim 22, wherein the instructions are operable to hold the radio state constant based on the comparison of the value of the counter and a second threshold.

28. The wireless communication device of claim 22, wherein the instructions are operable to:

compute values of a signal quality metric based on the respective motion detection signals; and

store the values of the parameter in a database based on a determination that the values of the signal quality metric meet a quality criterion for the motion detection process; and

determine the amount of variation based on the values of the parameter stored in the database.

29. The wireless communication device of claim 22, wherein the counter comprises a first counter, and the instructions are operable to:

compute values of a signal quality metric based on the motion detection signals processed by the radio subsystem in the changed radio state;

update a value of a second counter in response to a determination that the values of the signal quality metric do not meet a quality criterion for the motion detection process; and

change the radio state of the radio subsystem based on a comparison of the value of the second counter and a third threshold.

30. The wireless communication device of claim 22, wherein the instructions operable to change the radio state of the radio subsystem are operable to modify one or more modem parameters including a gain setting, an RF filter setting, an RF front end switch setting, a DC offset setting, an IQ compensation setting, digital DC correction setting, a digital gain setting, or a digital filtering setting.

23. A wireless communication device comprising:

a processor;

a modem comprising a radio subsystem that is configured to receive motion detection signals and process the motion detection signals while operating in a radio state of the radio subsystem; and

a memory storing instructions that are operable when executed by the processor to;

determine an amount of variation in the motion detection signals based on values of a parameter of the respective motion detection signals;

update a value of a counter in response to a determination that the variation is greater than a first threshold; and

change the radio state of the radio subsystem based on a comparison of the value of the counter and a second threshold; and

execute a motion detection process to detect motion of an object in a space based on motion detection signals processed by the radio subsystem in the changed radio state.