Magnetic Data Processing Device Offset Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic sensors on moving objects like mobile phones and vehicles face challenges in accurately correcting offsets due to measurement errors and non-uniform magnetic fields, requiring complex calibration processes that are cumbersome for users and inefficient in updating offsets.
Innovation Solution
A magnetic data processing device and method that simplifies the offset correction process by using a stored magnetic data set to derive a new offset as the sum of an old offset and a correction vector, where the correction vector is a linear combination of fundamental vectors based on the distribution of the data set, allowing for offset updates regardless of the data set's distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration method is used to derive offset, then measurement precision can be improved, but device complexity and ease of operation deteriorate due to complex calibration procedures requiring user intervention
Solution Approach 1:
The system automatically derives the offset using magnetic data collected during normal device operation without requiring user intervention. The processor continuously stores magnetic data and calculates the offset based on the distribution of stored data, enabling the system to self-calibrate without manual calibration procedures.
Solution Approach 2:
The system performs preliminary actions by continuously storing magnetic data in advance before the offset derivation is needed. The magnetic data is accumulated and processed to derive the offset, allowing the calibration to be performed automatically based on pre-collected data rather than requiring real-time user action.
2Measurement precision
If conventional calibration method is used to derive offset, then measurement precision can be improved, but device complexity increases due to binary decision processes and reliability determination
Solution Approach 1:
The system changes the approach by using the distribution characteristics of magnetic data (principal values and principal axis directions) as parameters to derive the offset. Instead of complex binary decisions, the offset is calculated based on the statistical distribution of stored magnetic data, simplifying the algorithm while maintaining precision.
Solution Approach 2:
The patent replaces complex mechanical calibration procedures with a computational approach using statistical analysis of magnetic data. The offset derivation is achieved through mathematical processing of data distribution rather than through complex control logic and binary decisions.
3Measurement precision
If magnetic data is stored to derive offset, then measurement precision improves, but loss of time increases due to required calibration period
Solution Approach 1:
The system performs continuous storage of magnetic data during normal device operation, eliminating the need for separate calibration periods. The offset is derived continuously from the accumulated data, allowing calibration to occur in parallel with regular device use without requiring dedicated time for calibration procedures.
Solution Approach 2:
Magnetic data is stored in advance during normal operation before the offset derivation is explicitly triggered. This preliminary data collection allows the offset to be calculated immediately when needed, reducing the overall time loss associated with calibration.
4Measurement precision
If strict calibration procedure is enforced, then measurement precision improves, but ease of operation deteriorates as users must intentionally operate the device in specific ways
Solution Approach 1:
The system automatically determines the offset based on the distribution of magnetic data collected during normal device use without requiring users to perform specific calibration operations. The processor analyzes the natural distribution of data to derive the offset, eliminating the need for users to intentionally position or orient the device in specific ways.
Solution Approach 2:
The system serves multiple functions by using the same magnetic data collection process for both normal operation and offset calibration. The magnetic data stored during regular device use is simultaneously utilized for deriving the offset, making the calibration process universal and integrated into normal operation rather than requiring separate specialized procedures.
Data Source
AI summary
In a magnetic data processing device, an input part sequentially inputs magnetic data outputted from a two-dimensional or three-dimensional magnetic sensor. The magnetic data is two-dimensional or three-dimensional vector data that is a linear combination of a set of fundamental vectors. The magnetic data processing device stores a plurality of the inputted magnetic data as a data set of statistical population in order to update an old offset of the magnetic data with a new offset. An offset derivation part derives the new offset based on the old offset and the data set of statistical population under a constraint condition that the new offset be obtained as the sum of the old offset and a correction vector.