Magnetic Compass Calibration Using Minimum Separation Angle Validation
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Solution Overview
Problem
Magnetic compasses integrated with other components often suffer from accuracy distortions due to hard and soft iron disturbances, requiring tedious data collection and large memory storage for effective calibration, which is cumbersome and inefficient.
Innovation Solution
A magnetic compass system with a processing unit that validates magnetic field samples at a minimum separation angle to calculate calibration coefficients, reducing the need for extensive user input and memory storage by automating data collection and ensuring a 3D span of magnetic field samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field samples are collected manually in predetermined orientations, then calibration accuracy is improved, but user operation complexity and time consumption increase
Solution Approach 1:
The system automatically collects magnetic field samples by utilizing the device's natural movements and orientations during normal operation, eliminating the need for manual positioning in predetermined orientations. The processing unit autonomously identifies valid samples that meet calibration criteria, making the calibration process self-service and removing the burden of complex user operations while maintaining calibration accuracy
Solution Approach 2:
The patent changes the parameter of sample validation from requiring predetermined orientations to accepting samples based on minimum separation angle criteria. This parameter change allows the system to utilize naturally occurring device orientations during normal use, transforming the calibration process from a manual, orientation-specific task to an automatic, orientation-agnostic process that maintains accuracy through mathematical criteria rather than physical positioning
2Measurement precision
If sufficient magnetic field samples are stored for accurate calibration, then calibration quality is improved, but memory capacity requirements increase
Solution Approach 1:
The system extracts only the essential calibration information from magnetic field samples by identifying and storing a minimal set of valid samples that meet the minimum separation angle criteria. Rather than storing all collected samples, the processing unit extracts and retains only those samples necessary for accurate calibration, significantly reducing memory capacity requirements while maintaining calibration quality
Solution Approach 2:
The patent applies partial action by collecting and validating samples during normal device operation without requiring excessive or complete coverage of all possible orientations. The system uses a partial set of samples gathered naturally during use, validating them against separation angle criteria, which provides sufficient calibration quality without the excessive memory requirements of comprehensive sample sets
3Ease of operation
If magnetic field samples are collected during normal device operation, then ease of operation is improved, but data sufficiency for calibration may be compromised
Solution Approach 1:
The processing unit continuously monitors collected magnetic field samples and provides feedback on their validity based on minimum separation angle criteria. This feedback mechanism ensures that samples collected during normal operation are systematically evaluated for sufficiency, and the system can determine when adequate calibration data has been gathered, maintaining reliability while allowing convenient data collection during normal use
Solution Approach 2:
The system performs preliminary validation of magnetic field samples as they are collected during normal operation, checking them against minimum separation angle criteria before final calibration computation. This preliminary action ensures data sufficiency is assessed incrementally throughout normal device use, rather than requiring post-collection evaluation, maintaining both convenience and reliability
Data Source
AI summary
A magnetic compass comprising a magnetometer for taking readings of a magnetic field and a processing unit that calibrates the magnetic compass is provided. The processing unit is configured to validate a predetermined number of magnetic field samples and calculate calibration coefficients from the validated magnetic field samples. Each validated magnetic field sample is at least a minimum separation angle apart from every other validated magnetic field sample.