Rail Positioning Device Verification via Waveguide Backscatter
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Solution Overview
Problem
Existing track-bound vehicle location systems using waveguides and fiber sensing do not meet the demanding safety requirements for safety-critical applications, such as rail safety engineering, due to unreliable signaling.
Innovation Solution
A method and device that incorporates a trackside sensor independent of the waveguide to detect and verify vehicle-specific parameters, ensuring reliable signaling by cross-checking measurement data from the waveguide with the sensor data, only providing a location signal if verification is successful, thereby enhancing the reliability of the location information for safety-relevant applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fiber sensing systems with waveguides are used for vehicle location, then location resolution and coverage are improved, but signaling reliability deteriorates
Solution Approach 1:
The patent introduces a verification unit as an intermediary component that mediates between the fiber sensing system and the safety-critical evaluation. This verification unit compares measurements from the fiber sensing system with reference values from a database to determine plausibility, thereby bridging the gap between the high-precision but unreliable fiber sensing system and the safety-critical requirements.
Solution Approach 2:
The patent implements a feedback mechanism where the verification unit continuously compares current fiber sensing measurements with stored reference values and provides feedback on plausibility. This feedback loop enables the system to adjust its confidence in the location data based on verification results, improving overall signaling reliability while maintaining high measurement precision.
2Ease of manufacture
If waveguide-based fiber sensing systems are deployed, then installation costs are reduced by leveraging existing infrastructure, but verification and trustworthiness of measurement values deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-storing reference measurement values in a database before actual vehicle location measurements are taken. This allows the verification unit to compare current measurements against known good reference values, establishing trustworthiness before safety-critical decisions are made, while utilizing existing waveguide infrastructure for cost-effective deployment.
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 allows for the use of location signals from waveguide evaluations in safety-critical applications with high accuracy (5-10 m resolution) and reduces installation and operational costs by leveraging existing waveguides, ensuring trustworthy measurement values and enabling applications like 'track clear' messages and train control.
Implementation Method 1
at least one electromagnetic pulse is supplied to the waveguide
Implementation Method 2
at least one backscatter pattern, produced by backscattering of the at least one electromagnetic pulse, is detected
Data Source
AI summary
A method operates a positioning device which has at least one waveguide laid along a route for positioning a track-bound vehicle on the route. Accordingly, the method proceeds in such a way that measurement data related to the track-bound vehicle are captured by a route-side sensor device. An electromagnetic pulse is fed into the waveguide and a backscatter pattern produced by backscattering of the electromagnetic pulse is detected and is subjected to an evaluation. A vehicle-specific characteristic value determined in the evaluation is verified on the basis of the captured measurement data and, if the verification of the at least one vehicle-specific characteristic value is successful, a positioning signal based on the evaluation of the at least one backscatter pattern and indicating the position of the track-bound vehicle is provided by the positioning device.