Geomagnetic Sensor Auto-Calibration via Acceleration Detection
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Solution Overview
Problem
Geomagnetic sensors in mobile devices, such as cellular phones, require frequent calibration to maintain accuracy due to changing environmental magnetic fields, but this frequent calibration process impairs user operability and can be neglected by users, leading to inconsistent measurement reliability.
Innovation Solution
A mobile device with position detection means and a controller that automatically initiates a geomagnetic sensor calibration process upon detecting a predetermined position change, such as changes in device orientation or form, allowing for frequent and accurate calibration without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a correction process is performed frequently to maintain measurement accuracy, then measurement precision is improved, but ease of operation deteriorates due to frequent user operations required
Solution Approach 1:
The system performs self-calibration automatically by detecting position changes through the acceleration sensor and initiating correction processes without requiring user intervention. The controller monitors acceleration data, determines when calibration is needed, and executes the correction process autonomously, allowing the system to serve itself rather than requiring manual user operations for each calibration.
Solution Approach 2:
The system performs preliminary calibration actions by detecting position changes in advance and initiating correction processes before measurement errors accumulate. The acceleration sensor continuously monitors position changes, and when a predetermined change is detected, the controller automatically starts the correction process, ensuring the sensor is calibrated before the next measurement rather than requiring post-error correction.
2Measurement precision
If a correction process is performed at regular intervals, then measurement accuracy is maintained, but ease of operation deteriorates due to frequent user operations required
Solution Approach 1:
The system implements feedback by continuously monitoring position changes through the acceleration sensor and using this information to dynamically determine when calibration is needed. The controller analyzes acceleration data in real-time, compares it against predetermined criteria, and automatically triggers correction processes only when necessary, creating a closed-loop system that responds to actual position changes rather than requiring fixed-interval manual calibration.
3Measurement precision
If the frequency of correction process is increased to maintain accuracy in changing environments, then measurement precision is improved, but loss of time increases due to frequent user operations
Solution Approach 1:
The system eliminates time loss by performing self-calibration automatically. The acceleration sensor continuously monitors position changes, and when a predetermined change is detected, the controller automatically initiates and completes the correction process without requiring the user to manually start calibration operations, thereby eliminating the time users would spend manually initiating and waiting for calibration processes.
4Ease of operation
If a correction process is not performed frequently, then ease of operation is maintained, but measurement precision deteriorates due to environmental changes
Solution Approach 1:
The system performs preliminary calibration actions by detecting position changes in advance and initiating correction processes before measurement errors accumulate. The acceleration sensor continuously monitors position changes, and when a predetermined change is detected, the controller automatically starts the correction process, ensuring the sensor is calibrated before the next measurement rather than requiring post-error correction.
Solution Approach 2:
The system implements feedback by continuously monitoring position changes through the acceleration sensor and using this information to dynamically determine when calibration is needed. The controller analyzes acceleration data in real-time, compares it against predetermined criteria, and automatically triggers correction processes only when necessary, creating a closed-loop system that responds to actual position changes rather than requiring fixed-interval manual calibration.
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 solution ensures that geomagnetic sensor calibrations are performed automatically and frequently, minimizing user burden and improving measurement accuracy while maintaining device operability.
Implementation Method 1
position detection means for detecting a position of the mobile device
Data Source
AI summary
A mobile device has a geomagnetic sensor, a position detection device, such as an acceleration sensor, for detecting a position of the mobile device, or a direction of a mobile device and a form of the mobile device, and a controller operable to control the geomagnetic sensor and the position detection device. When the position detection device detects a predetermined position change, the controller starts a correction process of the geomagnetic sensor based upon the detection.