Geomagnetic Fingerprint Indoor Positioning via Multi-Angle Magnetic Sensing
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Solution Overview
Problem
Current indoor positioning technologies for mobile terminals face challenges such as high deployment costs, high power consumption, and inaccurate positioning due to reliance on wireless beacons or scenario images, which require complex algorithms and additional reference devices.
Innovation Solution
A method and apparatus utilizing magnetic force sensors to generate geomagnetic fingerprints by measuring magnetic induction values at multiple angles, allowing for accurate positioning without the need for additional reference devices or complex scenarios, by matching these fingerprints against a stored database.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless beacon technology (Bluetooth, WiFi) is used for indoor positioning, then positioning function is achieved, but device deployment overhead increases and power consumption increases
Solution Approach 1:
The patent utilizes the mobile terminal's built-in magnetic force sensor to perform positioning measurements independently, without requiring external wireless beacon devices. The terminal itself serves as both the measuring instrument and the positioned object, eliminating deployment overhead while maintaining positioning functionality
Solution Approach 2:
The patent replaces the wireless communication-based positioning system (Bluetooth, WiFi) with a magnetic field-based positioning system. By substituting electromagnetic communication with magnetic field sensing, the system eliminates the need for complex beacon infrastructure while achieving positioning through the terminal's existing sensors
2Reliability
If scenario image technology is used for positioning, then positioning function is achieved, but positioning algorithm becomes complicated and accuracy decreases
Solution Approach 1:
The patent replaces complex image processing and feature matching algorithms with simple magnetic field value comparison. Instead of capturing, processing, and matching scenario images, the system directly compares magnetic induction values from the terminal's sensor against pre-stored fingerprint data, dramatically simplifying the positioning algorithm while improving accuracy
Solution Approach 2:
The patent changes the positioning parameter from visual image features to magnetic field induction values. By measuring magnetic field strength at different orientations and comparing these physical parameters against a fingerprint database, the system achieves simpler processing and more reliable positioning without complex image analysis
3Ease of operation
If magnetic force sensor measures from single angle only, then measurement process is simple, but positioning accuracy decreases
Solution Approach 1:
The patent segments the magnetic field measurement into multiple discrete angular orientations. Instead of a single measurement, the system performs measurements at multiple predetermined angles (e.g., 0°, 45°, 90°, 135°) and combines these segmented measurements into a comprehensive geomagnetic fingerprint, improving positioning accuracy while maintaining operational simplicity
Solution Approach 2:
The patent adds the angular orientation dimension to the magnetic field measurement. By measuring not just the magnitude but also the directional components of the magnetic field at multiple angles, the system creates a more distinctive fingerprint signature that improves positioning accuracy without significantly complicating the measurement process
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 increases positioning accuracy, reduces costs, and simplifies the positioning process by leveraging existing magnetic sensors in mobile devices, allowing for efficient and convenient indoor positioning without the need for special scenarios or additional hardware.
Implementation Method 1
obtaining respective magnetic induction values of the mobile terminal from at least two predetermined measurement angles at a position to be measured
Data Source
AI summary
A method and an apparatus of positioning a mobile terminal based on geomagnetism. The mobile terminal has at least one magnetic force sensor. The method includes obtaining magnetic induction values of the mobile terminal at a plurality of predetermined measurement angles at a position to be measured via a magnetic force sensor; generating a geomagnetic fingerprint of the position to be measured, the geomagnetic fingerprint including the plurality of predetermined measurement angles and a respective magnetic induction value measured at each of the plurality of predetermined measurement angles; sending the geomagnetic fingerprint of the position to be measured to a fingerprint map matching system to determine geographical position information corresponding to the geomagnetic fingerprint; and receiving the geographical position information corresponding to the geomagnetic fingerprint returned from the fingerprint map matching system, and setting the received geographical position information as geographical position information of the position to be measured. The present disclosure is able to perform matching through magnetic induction values of multiple measurement angles at a same position in a positioning and matching process to increase the accuracy of positioning and reduce the cost of positioning.