Magnetic Marker Detection Layout for False Positive Rejection
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Solution Overview
Problem
Conventional marker detection systems for vehicles using magnetic markers in roads face reliability issues due to external magnetic disturbances, leading to erroneous detection.
Innovation Solution
A marker detection system with at least two magnetic detection units spaced along the vehicle and corresponding magnetic markers arranged at equal spacings, where simultaneous detection by both units is required to confirm a magnetism generation source as a marker, reducing false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetic detection unit is used to detect magnetic markers, then the device complexity is reduced, but the reliability of detection deteriorates due to external magnetic disturbances from vehicles and other magnetism generation sources
Solution Approach 1:
The detection system is divided into multiple independent magnetic detection units arranged at specific intervals along the vehicle. Each detection unit independently monitors magnetic fields at its position, allowing the system to segment the detection task and cross-validate results to distinguish true markers from false sources
2Area of stationary object
If magnetic detection units are arranged at larger spacings to cover more area, then the detection coverage is improved, but the measurement precision deteriorates due to reduced ability to distinguish marker patterns from external disturbances
Solution Approach 1:
The system uses asymmetric spacing relationships between detection units and markers to create a unique detection pattern. True magnetic markers produce simultaneous signals in multiple detection units at specific time intervals, while external disturbances produce asymmetric or non-simultaneous signals that can be distinguished through pattern recognition
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 effectively reduces erroneous detection of non-marker magnetism sources, such as fallen objects or large metal structures, by ensuring that only simultaneous detection by both units is considered as a valid marker indication.
Implementation Method 1
a front-side sensor unit and a rear-side sensor unit which are arranged at spacings equal to spacings of two magnetic markers in a longitudinal direction of the vehicle... each of which has a plurality of magnetic sensors that detect magnetism in a vertical direction
Data Source
AI summary
In a marker detection method for detecting magnetic markers (10) laid in a road by sensor units (11) attached to a vehicle (5), in a marker detection system (1) including two sensor units (11) arranged so as to be separated in a longitudinal direction of the vehicle (5) and two magnetic markers (10) arranged at spacings equal thereto so as to be simultaneously detectable by the two sensor units (11), magnetism generation sources simultaneously detected by the two sensor units (11) are detected as the magnetic markers (10), thereby reducing erroneous detection.