Indoor Localization via Magnetic Distortion Detection
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Solution Overview
Problem
Indoor navigation in mobile devices is challenged by the inconsistency and unreliability of magnetic field data in distorted magnetic fields, leading to inaccurate localization results in enclosed or partially enclosed urban infrastructure and buildings.
Innovation Solution
A method for localizing a mobile device using data fusion inputs, including wireless signal, inertial, barometric, and optical data, with a magnetic distortion logic module that detects outlier magnetic parameters and switches to a transition localization mode when a distorted magnetic field is detected, minimizing the weighting of magnetic field data in the fusion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic field data is continuously used for indoor localization, then positioning functionality is maintained, but localization accuracy deteriorates in distorted magnetic field environments
Solution Approach 1:
The patent implements dynamic adjustment of magnetic field data usage based on detected field conditions. The system transitions between different operational modes (normal localization vs. transition localization) depending on whether magnetic distortions are detected, making the localization approach adaptive rather than static. This resolves the contradiction by allowing magnetic field data to be used when reliable but excluding it when distorted.
Solution Approach 2:
The system continuously monitors magnetic field parameters and uses this feedback to determine when to switch localization modes. By detecting outlier magnetic parameters and comparing them against thresholds, the system receives real-time feedback about field quality and adjusts its localization strategy accordingly, maintaining reliability while preventing accuracy degradation.
2Measurement precision
If magnetic distortion detection and mode switching is implemented, then localization accuracy is maintained in distorted fields, but system complexity increases
Solution Approach 1:
The patent divides the localization system into distinct functional modules: magnetic field sensing, outlier detection, threshold comparison, and mode switching. By segmenting the system this way, each component has a specific, simple function, making the overall complex system manageable and maintainable while achieving high localization accuracy through coordinated operation of these modular elements.
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
Enhances the accuracy and responsiveness of indoor navigation by timely detecting and compensating for distorted magnetic fields, ensuring reliable positioning determination even in areas with magnetic distortions.
Implementation Method 1
detect, based on magnetic field data of a magnetic field sensor device coupled to the processor, one or more outlier magnetic parameters in accordance with at least one magnetic parameter threshold
Data Source
AI summary
A method and system of localizing a mobile device having a processor and a memory. The method comprises localizing the mobile device, using the processor and the memory, along a sequence of positions describing a route being traversed in an indoor facility based on a set of data fusion inputs, detecting, based on magnetic field data of a magnetic field sensor device coupled to the processor, one or more outlier magnetic parameters in accordance with at least one magnetic parameter threshold, and upon establishing existence of a magnetic distortion field based upon the one or more outlier magnetic parameters, switching to a mobile device transition localization mode.