Geomagnetic Sensor Data Correction via Ellipsoid Approximation
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Solution Overview
Problem
Existing azimuth measuring devices face challenges in accurately and rapidly correcting for variations in external environments or disturbances, particularly due to influences from hard and soft magnetic materials, which affect geomagnetic sensor readings, leading to azimuth errors.
Innovation Solution
A physical quantity data correcting device and method that includes a computation control unit to control an approximate ellipsoid computing unit and correction coefficient computing unit using a control parameter group, allowing for accurate and rapid correction of physical quantity data by approximating an n-dimensional ellipsoid and computing correction coefficients to restore a spherical distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional correction methods (PTL 1 or PTL 2) are used, then correction can be performed, but accuracy and rapidity are insufficient under external environment variations or disturbances
Solution Approach 1:
The patent implements dynamic correction by switching between two correction modes: a first correction mode using a predetermined correction value for normal operation, and a second correction mode using dynamically calculated correction values when disturbances are detected. The computation control unit monitors environmental conditions and adapts the correction approach in real-time, allowing the system to maintain high accuracy across varying external conditions while responding rapidly to disturbances.
Solution Approach 2:
The patent changes the correction parameters dynamically based on detected disturbances. When a disturbance is detected, the system transitions from using a fixed predetermined correction value to using correction values calculated from current sensor data and environmental parameters. This parameter change enables the correction mechanism to adapt to external environment variations while maintaining measurement precision.
2Measurement precision
If complex correction computations are performed continuously, then correction accuracy improves, but computation time and processing load increase
Solution Approach 1:
The patent implements periodic correction computations triggered by disturbance detection events rather than continuous computation. The computation control unit monitors for disturbances and only initiates complex correction calculations when needed, using a predetermined correction value during normal operation. This periodic action reduces computation time and processing load while maintaining correction accuracy when disturbances occur.
Solution Approach 2:
The system uses its own sensor data and environmental information to automatically determine when correction computation is needed, without requiring external control. The computation control unit self-manages the switching between correction modes based on detected conditions, reducing the need for continuous external monitoring and computation while maintaining accuracy.
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 accurate and rapid correction of physical quantity data even under external variations or disturbances, improving the reliability of azimuth measurements by effectively addressing the distortions caused by magnetic materials.
Implementation Method 1
a geomagnetic sensor or an acceleration sensor for the purpose of providing a function corresponding to a user's taste or state
Implementation Method 2
When the magnetic component giving an influence to a measuring device is a component exhibiting hard magnetism such as a magnet, measured geomagnetic values have offsets and are distributed in a spherical shape centered on a vector corresponding to an offset magnetic field
Implementation Method 3
When the magnetic component giving an influence to a measuring device is a component exhibiting soft magnetism, such as iron, the measured geomagnetic values are deformed and distributed in an ellipsoidal shape
Data Source
AI summary
A physical quantity data correcting device accurately and rapidly makes corrections of physical quantity data by appropriately controlling an approximate ellipsoid computing unit and/or a correction coefficient computing unit on the basis of a control parameter group. A physical quantity data acquiring unit acquires physical quantity data output from a physical quantity detecting unit that detects physical quantities. A data selecting unit selects the acquired physical quantity data. An approximate ellipsoid computing unit computes an approximate expression of an n-dimensional ellipsoid indicating a distribution shape obtained by distributing the selected physical quantity data in an n-axis coordinate space. A correction coefficient computing unit computes correction coefficients for correcting the computed n-dimensional ellipsoid to an n-dimensional sphere. A computation control unit controls the approximate ellipsoid computing unit and/or the correction coefficient computing unit on the basis of a control parameter group. A correction data output unit corrects the physical quantity data.