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1. (WO2018132205) VARIABLE MAGNETIC FIELD-BASED POSITION

Pub. No.:    WO/2018/132205    International Application No.:    PCT/US2017/065069
Publication Date: Fri Jul 20 01:59:59 CEST 2018 International Filing Date: Fri Dec 08 00:59:59 CET 2017
IPC: G01S 5/02
G01S 5/04
G01B 7/30
Applicants: SONY INTERACTIVE ENTERTAINMENT INC.
BASHKIROV, Sergey
MATSUKAWA, Takeo
STAFFORD, Jeffrey R.
Inventors: BASHKIROV, Sergey
MATSUKAWA, Takeo
STAFFORD, Jeffrey R.
Title: VARIABLE MAGNETIC FIELD-BASED POSITION
Abstract:
To derive three dimensional (3D) position and orientation of a 3-axis (or more) magnetometer/accelerometer device (200) (such as may be implemented in VR or AR headset or computer game controller (1200)) without line of sight constraints, a spinning magnetic field (e.g., 304) is used to discriminate and remove the external (Earth's) magnetic field from the spinning magnetic field. This reduces the problem to finding (1004) the distance to the source of the magnetic field using a calibration table (or formula), finding (1102) two angles describing the deviation of the magnetic sensor from the axis of rotation of the spinning magnetic field and the phase around this axis, and from these values deriving (1106) the orientation of the sensor.