Magnetometer Calibration via Visual Gestural Path
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Solution Overview
Problem
Portable electronic devices equipped with magnetometers face challenges in maintaining accurate magnetic field measurements due to environmental changes and magnetic interference, which affects their calibration and operational reliability.
Innovation Solution
A method for calibrating magnetometers in portable electronic devices using visual affordance, where a gestural path is displayed on the device's screen, and the user moves the device through this path while measuring the magnetic field at various orientations, allowing for the acquisition of necessary data for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the magnetometer is calibrated manually without visual guidance, then the calibration process can be completed, but the ease of operation deteriorates due to lack of clear instructions
Solution Approach 1:
The system provides real-time visual feedback through a displayed gestural path that shows the user their current device orientation and progress through the calibration sequence. The visual indication updates dynamically as the user moves the device, confirming that proper orientations are being achieved and guiding corrections if orientations are incorrect.
Solution Approach 2:
A visual interface acts as an intermediary between the calibration system and the user. The display shows a gestural path that translates complex calibration requirements into simple visual guidance, mediating the interaction and making the calibration process intuitive without losing calibration data completeness.
2Ease of operation
If the calibration process is simplified with visual guidance, then the ease of operation improves, but the device complexity increases due to additional display and processing components
Solution Approach 1:
The display screen serves multiple functions: it shows the gestural path for calibration guidance, displays the current device orientation, provides feedback on calibration progress, and presents completion messages. This multi-functionality reduces the need for separate physical indicators or additional hardware components.
Solution Approach 2:
The system automatically processes the calibration data collected during the gestural path movement and performs the calibration without requiring additional user actions or complex manual procedures. The visual guidance system adapts to the user's movements and automatically determines when calibration criteria are met.
3Loss of time
If the magnetometer operates in changing environments without recalibration, then the loss of time is reduced, but the measurement precision deteriorates due to environmental magnetic interference
Solution Approach 1:
The system performs a quick calibration by having the user move the device through a simplified gestural path that captures essential calibration data faster than traditional methods. The visual guidance ensures proper orientations are achieved efficiently, providing preliminary calibration that maintains measurement precision in changing environments.
Solution Approach 2:
The system uses a reduced set of calibration movements (the gestural path) that captures the necessary calibration information without requiring exhaustive movement through all possible orientations. This partial action approach achieves sufficient calibration precision for environmental changes without the time cost of complete calibration sequences.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures efficient and effective calibration of magnetometers by providing a visual guide for user interaction, ensuring comprehensive data collection and improving the accuracy of magnetic field measurements, thereby enhancing the device's operational reliability across changing environments.
Implementation Method 1
A magnetometer is an instrument used to measure the strength and/or direction of the magnetic field in the vicinity of the instrument
Data Source
AI summary
A method and system are provided for calibrating a magnetometer of a mobile device. The method comprises displaying a visual indication of a gestural path on a display of the portable electronic device, monitoring for changes in orientation of the portable electronic device, changing the visual indication in response to the monitored changes in the orientation of the portable electronic device, measuring a magnetic field with the magnetometer, and calibrating the magnetometer in accordance with measurements of the magnetic field acquired at different points along the gestural path.