Optical-Fiber Distance Correction for Vehicle Vibration Positioning
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Solution Overview
Problem
Optical cables laid along roads often have excess length and flexure, leading to gaps between the optical cable distance and the actual road distance, which decreases the accuracy of identifying vehicle vibration positions.
Innovation Solution
A distance correction device that includes a vibration value derivation unit, a bridge optical fiber distance derivation unit, and a distance correction unit to correct optical fiber distances based on bridge positions and road distances, using vibration data characteristics to align optical fiber distances with road distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical cable is laid along the road, then vibration detection is enabled, but the optical cable distance deviates from the road distance due to excess length and flexure
Solution Approach 1:
The patent replaces the mechanical measurement approach (direct physical measurement of road distance) with an optical measurement approach (using optical fiber vibration data). By substituting the measurement mechanism, the system achieves both reliable vibration detection and accurate position identification through the relationship between optical cable distance and road distance derived from vibration characteristics
Solution Approach 2:
The patent changes the parameter used for distance measurement from direct mechanical measurement to optical fiber-based vibration analysis. By analyzing vibration frequency and amplitude patterns in the optical cable, the system derives the correspondence between optical cable distance and road distance, thereby improving position identification accuracy while maintaining vibration detection capability
2Measurement precision
If work is performed to associate optical cable distance with road distance using structure information and map information, then position identification accuracy is improved, but the process becomes burdensome and complex
Solution Approach 1:
The patent enables the system to automatically derive the relationship between optical cable distance and road distance using only vibration data from the optical fiber itself. The system performs self-calibration by analyzing vibration characteristics without requiring external structure information or map information, thereby eliminating the burdensome manual association process while maintaining high position identification accuracy
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
Improves the accuracy of identifying vehicle vibration positions on roads by aligning optical fiber distances with road distances without the need for complex data reference, such as structure and map information.
Implementation Method 1
vibration data being data representing magnitude of vibration detected by an optical fiber installed along a road
Data Source
AI summary
In order to facilitate accuracy improvement in identification of a position of vibration on a road caused by a vehicle and detected through an optical cable, this distance correction device: derives, from vibration data for each optical fiber distance detected through an optical fiber installed along the road on which the vehicle travels, a first vibration value indicating the magnitude of vibration within a prescribed frequency range for the optical fiber distance; derives, from the first vibration value, a bridge optical fiber distance which is an optical fiber distance to a prescribed position of the optical fiber installed at a bridge; and corrects, from the bridge optical fiber distance and a road distance which is a distance, along the road, from a reference point to a bridge optical fiber position, the optical distance within a prescribed range so as to be closer to the road distance.