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Calibrating a magnetic transmitter

A magnetic transmitter technology, applied in the field of calibration magnetic transmitters, can solve problems such as incorrect calibration and wrong positions, and achieve the effect of accelerating calibration and testing and simplifying the calibration process

Active Publication Date: 2019-07-26
ASCENSION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Incorrect calibration of the transmitter relative to the sensor (and vice versa) can cause the EMT system to report the wrong position of the sensor or transmitter

Method used

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  • Calibrating a magnetic transmitter

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Embodiment Construction

[0041]Electromagnetic tracking (EMT) systems can be used in gaming and / or surgical settings to track devices (e.g., game controllers, head-mounted displays, medical devices, robotic arms, etc.), allowing users of the system to know their corresponding three-dimensional positions and orientation. Augmented reality (AR) and virtual reality (VR) systems also use EMT systems to perform head, hand, and body tracking, for example, to synchronize a user's movements with AR / VR content. Such EMT systems use a magnetic transducer in proximity to the magnetic sensor to determine the position and / or orientation of the sensor relative to the transducer. Transmitters and sensors used in such systems can be calibrated to ensure that the transmitters and sensors can provide accurate position and orientation information to the user. If the EMT sensor or transmitter is not calibrated or not calibrated correctly, the accuracy can be greatly reduced.

[0042] Calibration of a magnetic transmitt...

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Abstract

A calibration device comprising: a plurality of magnetic sensors positioned at the calibration device, the plurality of magnetic sensors defining a space; a controller configured to be positioned in the space defined by the plurality of magnetic sensors, wherein the controller includes a magnetic transmitter; and one or more processors configured to: cause the magnetic transmitter to generate magnetic fields; receive signals from the plurality of magnetic sensors that are based on characteristics of the magnetic fields received at the plurality of magnetic sensors; calculate, based on the signals received from the plurality of magnetic sensors, positions and orientations of the plurality of magnetic sensors relative to a position and orientation of the magnetic transmitter; and determine whether the calculated positions and orientations of the plurality of magnetic sensors are within one or more threshold limits of known positions and orientations of the plurality of magnetic sensors.

Description

[0001] priority claim [0002] This application claims priority under 35 USC § 119(e) to US Patent Application Serial No. 62 / 619,624, filed January 19, 2018, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to calibrating magnetic transmitters. Background technique [0004] Augmented reality (AR), virtual reality (VR), and other systems can use electromagnetic tracking (EMT) systems to help locate devices in various situations (eg, gaming, medical, etc.). Such systems utilize a magnetic transmitter close to the magnetic sensor so that the sensor and transmitter can be spatially positioned relative to each other. Incorrect calibration of the transmitter relative to the sensor (and vice versa) may cause the EMT system to report the wrong location of the sensor or transmitter. Contents of the invention [0005] Calibration of a magnetic transmitter may be performed by positioning the transmitter in a ...

Claims

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Application Information

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IPC IPC(8): G01R35/00
CPCG01R35/005G01C17/38G06F3/012G06F3/017G01R33/0206G01R33/028G01B7/003G01B21/042G01R33/0035G01B7/004G06F3/0346
Inventor 马克·罗伯特·施奈德查尔斯·罗伯特森约瑟夫·布鲁斯·德菲
Owner ASCENSION TECH
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