Self-Calibrating Magnetic Distortion Compensation Architecture
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Solution Overview
Problem
Modern mobile electronic systems face significant heading errors due to magnetic distortion from ferromagnetic materials, requiring costly and inflexible external calibration fixtures for accurate navigation and augmented reality applications.
Innovation Solution
A self-calibrating system architecture that includes calibration coils and circuitry to measure and compensate for magnetic distortion by generating sensitivity values based on baseline and measured magnetic field vectors, allowing for on-demand and cost-effective magnetic calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external calibration fixtures are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system performs self-calibration using internally integrated calibration coils and magnetometer, eliminating the need for external calibration fixtures. The calibration process is automated and executes within the electronic system itself, reducing complexity while maintaining precision.
Solution Approach 2:
The calibration coils serve multiple functions: they generate magnetic fields for calibration purposes, and the same coils can be used during normal operation to compensate for magnetic distortions. This multi-functionality reduces the need for separate calibration hardware.
2Measurement precision
If external calibration fixtures are used, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The system performs calibration automatically during manufacturing or initial setup, storing the calibration data for use during normal operation. This preliminary calibration action eliminates the need for time-consuming external calibration fixtures during subsequent use.
Solution Approach 2:
The self-calibrating system can perform rapid calibration cycles automatically without requiring manual intervention or external fixtures, significantly reducing the time lost to calibration procedures while maintaining accurate heading measurements.
3Measurement precision
If traditional calibration methods are used, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The system uses its own internally integrated components (calibration coils and magnetometer) to perform calibration, eliminating the need to purchase and use expensive external calibration fixtures. This self-service approach significantly reduces manufacturing and deployment costs.
Solution Approach 2:
The calibration functionality is merged with the main electronic system components, combining the calibration coils, magnetometer, and processing logic into a single integrated system. This integration eliminates the need for separate external calibration equipment and reduces overall system cost.
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 accurate and reliable device heading performance by compensating for magnetic distortion, reducing errors and enhancing navigation and augmented reality applications without the need for external calibration fixtures.
Implementation Method 1
first circuitry configured to excite the calibration coils during a calibration phase of the electronic system; second circuitry configured to measure a first magnetic field vector in a vicinity of the magnetometer that is generated by the excited calibration coils
Data Source
AI summary
Systems, methods, apparatuses and non-transitory computer-readable mediums are disclosed for a self-calibrating system architecture for magnetic distortion compensation. In an embodiment, an electronic system comprises: a magnetometer; a plurality of spaced-apart calibration coils proximate to the magnetometer; first circuitry configured to excite the calibration coils during a calibration phase of the electronic system; second circuitry configured to measure a first magnetic field vector in a vicinity of the magnetometer that is generated by the excited calibration coils; third circuitry configured to: generate sensitivity values based on the first magnetic field vector measurement and a baseline magnetic field vector; and a storage device configured for storing the sensitivity values.