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1. EP2669627 - System and method for calibrating a magnetometer on a mobile device

Office
European Patent Office
Application Number 12170353
Application Date 31.05.2012
Publication Number 2669627
Publication Date 04.12.2013
Publication Kind B1
IPC
G01C 17/28
GPHYSICS
01MEASURING; TESTING
CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
17Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
02Magnetic compasses
28Electromagnetic compasses
G01C 17/38
GPHYSICS
01MEASURING; TESTING
CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
17Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
38Testing, calibrating, or compensating of compasses
G01R 33/00
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
CPC
G01C 17/28
GPHYSICS
01MEASURING; TESTING
CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
17Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
02Magnetic compasses
28Electromagnetic compasses
G01C 17/38
GPHYSICS
01MEASURING; TESTING
CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
17Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
38Testing, calibrating, or compensating of compasses
G01R 33/0035
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
0023Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
0035Calibration of single magnetic sensors, e.g. integrated calibration
Applicants BLACKBERRY LTD
Inventors OLIVER ROBERT GEORGE
ALMALKI NAZIH
Designated States
Priority Data 12170353 31.05.2012 EP
Title
(DE) System und Verfahren zur Kalibrierung eines Magnetometers auf einer mobilen Vorrichtung
(EN) System and method for calibrating a magnetometer on a mobile device
(FR) Système et procédé pour étalonner un magnétomètre sur un dispositif mobile
Abstract
(EN)
A method and system are provided for calibrating a magnetometer on a mobile device. The method includes obtaining one or more pairs of magnetometer readings. Each pair includes a first reading and a second reading. For each pair of magnetometer readings, the method also includes determining a rotation axis direction and a rotation angle corresponding to a change in orientation of the mobile device between obtaining the first reading and the second reading and determining a rotation axis for the pair of magnetometer readings using the rotation axis direction and rotation angle. The method also includes determining a calibration parameter based on at least one property of one or more of the rotation axes.

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