Invention Grant
- Patent Title: Biologically-constrained drift correction of an inertial measurement unit
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Application No.: US16774870Application Date: 2020-01-28
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Publication No.: US11409360B1Publication Date: 2022-08-09
- Inventor: William Owen Brimijoin, II , Andrew Lovitt
- Applicant: Facebook Technologies, LLC
- Applicant Address: US CA Menlo Park
- Assignee: Facebook Technologies, LLC
- Current Assignee: Facebook Technologies, LLC
- Current Assignee Address: US CA Menlo Park
- Agency: Fenwick & West LLP
- Main IPC: G06F3/01
- IPC: G06F3/01 ; G02B27/00 ; H04R5/033 ; H04R5/04 ; G02B27/01

Abstract:
A method comprising determining a set of position parameters for an inertial measurement unit (IMU) on a headset worn by a user. The set of position parameters includes at least a first yaw measurement and a first roll measurement. The set describes a pointing vector. The method further comprises calculating a drift correction component that describes a rate of correction. The drift correction component is based at least in part on the set of position parameters. The method further comprises applying the drift correction component to one or more subsequent yaw measurements for the IMU. The drift correction component forces an estimated nominal position vector to the pointing vector at the rate of correction.
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