Geomagnetic Signal Processing for Indoor Positioning
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Solution Overview
Problem
Existing geomagnetic positioning methods require manual calibration and often rely on additional sensors or methods for accuracy, leading to poor usability and accuracy issues when using geomagnetic sensors alone for indoor positioning.
Innovation Solution
A method and apparatus that apply a signal processing filter to determine whether geomagnetic signals are noise or offset, converting the signals into high frequency signals and correcting them based on convergence within a predetermined time window, allowing for automatic correction and improved accuracy without manual calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration is performed for geomagnetic sensor, then positioning accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs automatic self-calibration by detecting the user's movement state and automatically determining offset values without requiring manual user intervention. The processor automatically identifies when the user is stationary and applies correction values to the geomagnetic sensor data, enabling the system to serve itself rather than requiring user calibration actions.
Solution Approach 2:
The system performs preliminary calibration actions by pre-determining offset values and storing them in memory before actual positioning operations. When positioning is needed, the system retrieves and applies the pre-calculated correction values, eliminating the need for manual calibration at the time of use and improving both accuracy and ease of operation.
2Measurement precision
If additional sensors or positioning methods are used for verification, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts and isolates the calibration function into a separate, self-contained module that operates independently from the main positioning system. By separating the calibration process and using stored offset values, the system achieves high accuracy without requiring multiple sensors or complex verification mechanisms, thus reducing overall device complexity.
3Device complexity
If geomagnetic sensor is used alone for positioning, then device complexity is reduced, but positioning accuracy deteriorates due to zero point distortion
Solution Approach 1:
The patent introduces an intermediary correction mechanism that processes the geomagnetic sensor output through offset value determination and application. This intermediary layer (the calibration system) mediates between the raw sensor data and the final positioning results, eliminating zero point distortion while keeping the overall system simple by using computational correction rather than additional hardware sensors.
Data Source
AI summary
A method for performing geomagnetic signal processing using a geomagnetic signal processing apparatus is provided. The method includes obtaining a geomagnetic signal based on a geomagnetic sensor output; converting the obtained geomagnetic signal into a high frequency signal having a frequency equal to or higher than a reference frequency using a signal processing filter; extracting abnormal high frequency signal values outside a predetermined critical range from the converted high frequency signal; determining whether a sum of the extracted abnormal high frequency signal values converges into a critical range a preset time window; and correcting the geomagnetic signal based on the determining.