Electronic Compass Calibration for Portable Devices
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Solution Overview
Problem
Portable electronic devices with electronic compasses face precision issues in detecting azimuth due to changes in configuration, which alter the combinational magnetic field, leading to biased measurements.
Innovation Solution
A calibration method and device that load corresponding default settings based on sensor status parameters when the device changes configuration, allowing the electronic compass to accurately detect the geomagnetic field and output azimuth data by switching between different default settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic compass uses a fixed default setting for detecting the geomagnetic field, then the device structure remains simple, but the measurement precision deteriorates when the device configuration changes
Solution Approach 1:
The patent pre-calibrates the electronic compass for multiple device configurations (first using configuration and second using configuration) and stores corresponding default settings in advance. When the device configuration changes, the system retrieves and applies the pre-prepared default setting corresponding to the new configuration, eliminating the need for real-time recalibration and maintaining high measurement precision without complex real-time adjustment mechanisms
Solution Approach 2:
The patent implements a dynamic calibration system that automatically detects device configuration changes through sensor status parameters and switches between different default settings accordingly. The system dynamically adjusts the default setting based on the current configuration state, ensuring the electronic compass maintains accurate azimuth detection across varying device configurations without requiring manual intervention
2Measurement precision
If the electronic compass is calibrated for each different device configuration, then the azimuth detection precision is maintained, but the device complexity and calibration process become more complex
Solution Approach 1:
The patent implements an automatic calibration system that self-detects device configuration changes through sensor status parameters and autonomously switches between pre-stored default settings. The system performs the calibration process without user intervention, detecting configuration changes and applying appropriate default settings automatically, thereby maintaining high azimuth detection precision while preserving ease of operation
Solution Approach 2:
The patent employs a feedback mechanism where the sensor continuously monitors device configuration status and provides feedback to the calibration system. When configuration changes are detected, the feedback triggers automatic retrieval and application of the corresponding default setting, creating a closed-loop system that maintains accurate azimuth detection across configuration changes without requiring manual calibration operations
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
Enables the electronic compass to quickly and precisely detect the geomagnetic field and output accurate azimuth data across various device configurations, improving navigation accuracy by adapting to changes in the magnetic field induced by different operational modes.
Implementation Method 1
a magnetic detector configured inside the housing for loading a first default setting or a second default setting for detecting the first magnetic field and outputting azimuth data
Data Source
AI summary
One or more sensors in a portable electronic device have individual status parameter in response to different using configurations. When the portable electronic device operates in a first using configuration, an electronic compass in the portable electronic device loads a corresponding first default setting, according to the status parameter of the sensors operated in the first using configuration, and detects the geomagnetic field for outputting azimuth data. When the portable electronic device changes its configuration from the first using configuration to a second using configuration, the electronic compass stops detecting the geomagnetic field and loads a corresponding second default setting, according to the status parameter of the sensors operated in the second using configuration, and detects the geomagnetic field for outputting azimuth data. The electronic compass is capable of properly detecting the geomagnetic field by loading different default settings when facing interference of different magnetic fields.