Electronic Compass Interference Source Identification
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Solution Overview
Problem
Electronic compasses face challenges in accurately indicating magnetic north due to interference magnetic fields, which existing technologies struggle to fully remove, leading to unreliable directional readings.
Innovation Solution
The method involves displaying a first arrow indicating corrected magnetic north and a second arrow pointing towards the source of the interference magnetic field on a device's display, using a magnetometer, accelerometer, and processor to calculate and render these arrows, allowing users to identify and potentially move away from interference sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration methods are used to remove interference magnetic field contribution, then the electronic compass can provide accurate indication of magnetic north, but the interference magnetic field cannot be fully removed leading to unreliable directional readings
Solution Approach 1:
The patent introduces an intermediary indicator (second arrow) that points toward the interference source, mediating between the raw magnetic field data and the corrected directional reading. This allows users to visually identify and avoid interference sources while maintaining accurate directional indication through the first arrow
Solution Approach 2:
The system provides visual feedback by displaying both the corrected magnetic north direction and the interference source direction simultaneously. This feedback mechanism allows users to understand the quality of the magnetic environment and adjust their position to improve reading reliability
2Measurement precision
If existing technologies attempt to remove interference magnetic field, then directional accuracy is improved, but the interference source remains unidentified making it impossible to move away from interference
Solution Approach 1:
The patent segments the magnetic field information into two distinct visual indicators: one showing the corrected magnetic north direction and another showing the interference source direction. This segmentation preserves both the accurate directional information and the interference source location information simultaneously
Solution Approach 2:
The second arrow acts as an intermediary that conveys information about the interference source location without interfering with the primary function of indicating magnetic north. This intermediary element preserves critical information that would otherwise be lost in the calibration process
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 provides users with a clear indication of magnetic north and the source of interference, enhancing the accuracy and reliability of directional readings by allowing them to minimize interference, thus improving the certainty of magnetic north direction.
Implementation Method 1
a magnetometer for generating magnetic north data based on a location of the electronic device
Implementation Method 2
an accelerometer for generating orientation data based on an orientation of the electronic device
Data Source
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AI summary
A method of indicating an interference magnetic field at an electronic device (100) includes: displaying a first arrow (206) indicating a direction of magnetic north on a display (112) of the electronic device, the direction of the first arrow (206) corrected to remove interference caused by an interference magnetic field; and displaying a second arrow (208) indicating a direction of a source of the interference magnetic field on a display (112) of the electronic device (100).