Radio Signal Localization Using Electromagnetic Property Comparison
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Solution Overview
Problem
Conventional localization methods for mobile devices indoors are limited by the reliance on GPS, which is unreliable indoors, and require pre-existing maps or positional references, failing in environments where these are not available or known.
Innovation Solution
A system that uses radio signals from fixed transmitters to determine a user's position by comparing electromagnetic properties, forming a graph of reference paths and current positions, allowing navigation without pre-defined maps or positional references, using a comparator and determiner to guide the user through a routing algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS satellite-aided system is used for outdoor localization, then positioning accuracy is improved, but it becomes unreliable when used indoors
Solution Approach 1:
The patent applies universality by creating a localization system that works across multiple environments (outdoor and indoor) using a single unified approach. The system uses radio signals from fixed transmitters that can be deployed both outdoors and indoors, eliminating the need for separate GPS and indoor localization systems. The graph-based representation and electromagnetic property comparison methods are environment-agnostic, providing universal localization capability.
Solution Approach 2:
The patent introduces an intermediary approach by using radio signal electromagnetic properties as a mediator between the physical environment and the localization process. Instead of directly using satellite signals that fail indoors, the system mediates localization through comparison of electromagnetic properties (signal strength, phase, timing) from fixed transmitters, which can penetrate and propagate through building structures.
2Measurement precision
If conventional localization methods based on triangulation or lateration are used, then positioning can be achieved, but pre-existing maps or positional references are required
Solution Approach 1:
The patent applies preliminary action by pre-computing and storing electromagnetic property profiles for multiple reference paths before actual localization occurs. During operation, the system only needs to compare current measurements against these pre-stored profiles, eliminating the need for real-time complex calculations or pre-existing maps. The reference paths and their electromagnetic characteristics are established in advance, enabling rapid localization without extensive setup.
Solution Approach 2:
The patent uses copying by creating electromagnetic property copies or profiles for each reference path. Instead of storing detailed geometric map information, the system stores copied electromagnetic characteristics (signal strength patterns, phase relationships, timing information) that can be directly compared with measurements. This copying approach simplifies the data structure and reduces system complexity while maintaining positioning accuracy.
3Ease of operation
If pre-existing maps and positional references are used for navigation, then routing can be calculated, but the system fails in environments where these are not available
Solution Approach 1:
The patent applies inversion by reversing the conventional approach: instead of using maps to determine position and then providing navigation, the system uses measured electromagnetic properties to directly identify the current position on a reference path and derives navigation instructions from that identification. The graph structure is built from reference paths rather than from map data, inverting the traditional map-centric navigation paradigm to enable operation without pre-existing maps.
4Ease of operation
If graph-based routing algorithm is used to determine guidance path, then navigation route can be calculated, but computational requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-computing the graph structure from reference paths and storing it for later use. The graph nodes (intersection points) and edges (path segments) are established in advance based on stored electromagnetic profiles. During actual navigation, the routing algorithm operates on this pre-built graph rather than processing raw environmental data, significantly reducing real-time computational energy requirements while maintaining the ability to calculate optimal guidance paths.
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
Enables accurate localization and navigation within indoor environments without the need for pre-existing maps or positional references, using electromagnetic properties of radio signals to identify geographic positions and guide users intuitively.
Implementation Method 1
radio signals may be received along the path from fixedly positioned radio transmitters... comparing electromagnetic properties of the radio signals
Data Source
AI summary
An apparatus for localizing a position on a path, radio signals of fixedly positioned radio transmitters being receivable along the path, the apparatus including a determiner for determining properties of the radio signals of the fixedly positioned radio transmitters at the position, and a comparator for comparing the determined electromagnetic properties with previously recorded properties which characterize a reference path, and for determining a relation between the position and the reference path on the basis of a result of the comparison.