Substitutionary portable calibration device method for correction of magnetometer of access point

Patent metadata

Field	Value
Publication number	US-12019126-B2
Application number	US-202217977282-A
Country	US
Kind code	B2
Filing date	Oct 31, 2022
Priority date	Oct 31, 2022
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A method for calibrating a magnetometer of a device is provided. The method includes collecting, with a portable calibration device having a magnetometer, magnetic field measurements in a spatial region about a mounting location where the device is to be installed for operation, estimating magnetometer compensation parameters to correct for magnetic field distortion at the mounting location based on the magnetic field measurements collected by the portable calibration device, and configuring the device installed at the mounting location based on the magnetometer compensation parameters.

First claim

What is claimed is:

1. A method for calibrating a magnetometer of a device, the method comprising:
collecting, with a hand-held portable calibration device having a magnetometer, magnetic field measurements in a spatial region about a mounting location where the device is to be installed for operation, wherein collecting the magnetic field measurements is performed while hand-held portable calibration device is moved in a three-dimensional (3D) space about three axes to cover a sphere of measurement at the mounting location where the device is to be installed;
estimating magnetometer compensation parameters to correct for magnetic field distortion at the mounting location based on the magnetic field measurements collected by the hand-held portable calibration device; and
configuring the device installed at the mounting location based on the magnetometer compensation parameters.

2. The method of claim 1 , further comprising outputting a user instruction on the hand-held portable calibration device to perform a particular movement in a “ FIG. 8 ” motion at the mounting location where the device is to be installed.

3. The method of claim 1 , wherein estimating comprises estimating hard-iron magnetic field distortion and soft-iron magnetic field distortion caused by objects near the mounting location of the device.

4. The method of claim 1 , further comprising:
sending the magnetic field measurements to a network controller,
wherein estimating is performed by the network controller.

5. The method of claim 4 , wherein configuring includes the network controller sending, via a network communication, the magnetometer compensation parameters to the device.

6. The method of claim 5 , wherein collecting, estimating and configuring is performed for each of a plurality of devices each having a magnetometer and each of the plurality of devices to be installed for operation at a respective mounting location.

7. The method of claim 6 , further comprising:
electronically reading, with the hand-held portable calibration device, identification information on each device of the plurality of devices prior to collecting magnetic field measurements in order to determine a unique identifier of each of the plurality of devices against which the magnetic field measurements are associated.

8. The method of claim 1 , wherein the portable calibration device is a smartphone or other portable handheld electronic device, and wherein the device is a wireless access point (AP) having an integrated magnetometer and an external antenna.

9. The method of claim 8 , further comprising:
predicting a wireless coverage area of the wireless AP based on the magnetometer compensation parameters.

10. The method of claim 8 , further comprising:
performing live directional adjustments of the wireless AP, configured with the magnetometer compensation parameters via a network connection to a network controller.

11. The method of claim 1 , wherein estimating comprises computing the magnetometer compensation parameters to account for any different responses of the magnetometer of the hand-held portable calibration device and the magnetometer of the device.

12. A system for calibrating a magnetometer of a target device, the system comprising:
a hand-held portable calibration device having a magnetometer that is configured to collect magnetic field measurements in a spatial region about a mounting location where the target device is to be installed for operation, wherein the hand-held portable calibration device is configured to collect the magnetic field measurements it is moved in a three-dimensional (3D) space about three axes to cover a sphere of measurement at the mounting location where the device is to be installed; and
a remote computing device in communication with the portable calibration device and the target device,
wherein at least one of the hand-held portable calibration device and/or the remote computing device is configured to:
estimate magnetometer compensation parameters to correct for magnetic field distortion at the mounting location based on the magnetic field measurements collected by the hand-held portable calibration device, and
configure the target device installed at the mounting location based on the magnetometer compensation parameters.

13. The system of claim 12 , wherein the portable calibration device is further configured to output a user instruction to perform a particular movement at the mounting location where the target device is to be installed.

14. The system of claim 12 , wherein the at least one of the hand-held portable calibration device and/or the remote computing device is configured to estimate the magnetometer compensation parameters by estimating hard-iron magnetic field distortion and soft-iron magnetic field distortion caused by objects near the mounting location of the target device.

15. The system of claim 12 , wherein the hand-held portable calibration device is configured to estimate the magnetometer compensation parameters, and send the magnetometer compensation parameters to the remote computing device via a network communication,
wherein the remote computing device is configured to receive the magnetometer compensation parameters from the hand-held portable calibration device, and send the magnetometer compensation parameters to the target device via a network communication in order to configure the target device.

16. The system of claim 12 , wherein the hand-held portable calibration device is configured to send the magnetic field measurements to the remote computing device via a network communication,
wherein the remote computing device is configured to receive the magnetic field measurements from the hand-held portable calibration device, estimate the magnetometer compensation parameters, and configure the target device by sending the magnetometer compensation parameters to the target device via a network communication.

17. A non-transitory computer readable medium storing a program of instructions, which when executed by a processor of an electronic device, cause the electronic device to perform operations for calibrating a magnetometer of a target device, comprising:
obtaining, with a hand-held portable calibration device having a magnetometer, magnetic field measurements in a spatial region about a mounting location where the target device is to be installed for operation, the magnetic field measurements being obtained as the hand-held portable calibration device is moved in a three dimensional (3D) space about three axes to cover a sphere of measurement at the mounting location where the device is to be installed;
estimating magnetometer compensation parameters to correct for magnetic field distortion at the mounting location based on the magnetic field measurements; and
configuring the target device installed at the mounting location based on the magnetometer compensation parameters.

18. The non-transitory computer readable medium according to claim 17 , wherein the instructions when executed by the processor of the hand-held portable calibration device cause the hand-held portable calibration device to perform operations comprising:
sending the magnetometer compensation parameters to the target device, or to a network controller, via a network communication to configure the target device.

19. The non-transitory computer readable medium according to claim 17 , wherein the electronic device is a network controller in communication with a—the hand-held portable calibration device and the target device, wh

Assignees

• Cisco Tech Inc

Inventors

• Anderson Fred Jay
• Swartz John Matthew
• Henry Jerome
• Barton Robert Edgar
• Silverman Matthew Aaron
• Marlborough Michael F

Classifications

• G01R33/0047

  Housings or packaging of magnetic sensors (packaging of semiconductor devices H10W99/00); Holders · CPC title

• G01R33/0206

  Three-component magnetometers · CPC title

• G01C17/38

  Testing, calibrating, or compensating of compasses · CPC title

• G01R33/0023 Primary

  Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration (G01R33/0017 takes precedence) · CPC title

• G01R33/0035 Primary

  Calibration of single magnetic sensors, e.g. integrated calibration · CPC title