Magnetic Marker Detection Using Time-Correlated Dual Sensors
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Solution Overview
Problem
Conventional magnetic marker detection systems face reliability issues due to disturbance magnetism from nearby vehicles, leading to false detection of magnetic markers.
Innovation Solution
A magnetic marker detection system using marker detection units placed at least two places apart in a vehicle's longitudinal direction, where detection by one unit triggers a predetermined period for detection by the other unit to confirm the presence of a magnetic marker, reducing false positives by requiring simultaneous detection across multiple units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single marker detection unit is used to detect magnetic markers, then the device complexity is reduced, but the detection reliability deteriorates due to disturbance magnetism from nearby vehicles
Solution Approach 1:
The detection system is segmented into multiple marker detection units positioned at different locations (front and rear) on the vehicle. Each unit independently detects magnetic markers, and their results are combined through correlation analysis to improve overall detection reliability while maintaining manageable system complexity
Solution Approach 2:
The system uses feedback from multiple detection units to verify and confirm magnetic marker detections. When one unit detects a marker, the system checks for corresponding detections from other units within a predetermined time window, providing feedback validation that eliminates false positives from disturbance magnetism
2Reliability
If multiple marker detection units are used to improve detection reliability, then the detection reliability improves, but the device complexity increases
Solution Approach 1:
The system uses a minimal number of marker detection units (front and rear positions) rather than continuous coverage, achieving sufficient detection reliability through strategic partial placement. This reduces device complexity while maintaining the benefits of multiple detection points
Solution Approach 2:
The system pre-establishes correlation criteria and predetermined time windows for marker detection validation. By preparing these decision rules in advance, the system simplifies the real-time processing complexity while maintaining high detection reliability through pre-defined verification logic
3Speed
If immediate determination is made based on single detection unit results, then the detection speed is improved, but the measurement precision deteriorates due to false detection
Solution Approach 1:
The system implements periodic correlation checking within predetermined time windows after initial detection. This periodic verification maintains detection speed by using time-bound validation rather than continuous verification, while improving measurement precision through systematic false positive elimination
Solution Approach 2:
The system creates a temporal copy of the detection event by recording the detection time and position, then compares this copy against subsequent detections from other units within a predetermined time window. This copying approach enables rapid verification without requiring complex real-time analysis, maintaining speed while improving precision
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 enhances detection accuracy and reliability by ensuring that a magnetic marker is only confirmed if detected within a predetermined period by both units, minimizing immediate false determinations and reducing hardware load and costs.
Implementation Method 1
detect, with a magnetic sensor or the like of a vehicle, magnetic markers laid along a lane
Data Source
AI summary
A magnetic marker detection system (1), for detecting, by using sensor units (11) disposed in at least two places separated from each other in a longitudinal direction of a vehicle (5), a magnetic marker (10) disposed in a traveling path, sets, when a magnetic marker has been detected by a front side sensor unit (11), a predetermined period including a predicted point of time of detection of the magnetic marker (10) by a rear side sensor unit (11) and makes, when the rear-side sensor unit (11) has successfully detected the magnetic marker (10) during the predetermined period, a determination that the magnetic marker (10) has been detected.