Train Disturbance Wave Source Localization Using Reception Power Features
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Solution Overview
Problem
Existing train control systems using wireless communication are vulnerable to disturbance waves, which can disrupt communication and potentially violate radio laws, necessitating the early estimation of the disturbance wave's generation source.
Innovation Solution
A data processing device that estimates the lateral position of a disturbance wave generation source by analyzing measured reception power values and using learning data to identify candidate distances and features, ultimately pinpointing the precise location of the disturbance source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless communication is used for train control, then communication flexibility and wiring reduction are improved, but the system becomes vulnerable to disturbance waves that can disrupt communication
Solution Approach 1:
The system performs preliminary actions by continuously monitoring reception power values and detecting disturbance waves before they cause critical communication failures. The disturbance wave detection unit identifies disturbances in advance, allowing the system to estimate the generation source position and take preventive measures before communication is completely disrupted.
Solution Approach 2:
The patent introduces intermediary components including a disturbance wave detection unit, a generation source position estimation unit, and a communication unit. These intermediaries detect disturbance waves, estimate their origins using reception power value features and learning data, and communicate location information to appropriate systems, thereby protecting the wireless communication system from disturbance wave impacts.
2Reliability
If disturbance wave detection and position estimation systems are added, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The on-train wireless communication apparatus performs multiple functions: it serves as both the primary communication device and the disturbance wave detection device. The same reception circuits that monitor communication signals also detect disturbance waves, eliminating the need for separate dedicated detection hardware and reducing overall system complexity.
Solution Approach 2:
The system uses its own existing resources for disturbance wave detection. The on-train wireless communication apparatus monitors its own reception power values and uses its processing units to detect disturbances and estimate generation source positions, rather than requiring entirely separate detection systems. This self-service approach reduces complexity while maintaining reliability.
Data Source
AI summary
A purely-lateral position estimation unit (1603) estimates as an estimated purely-lateral position, when a disturbance wave to disturb communication performed in a train is generated while the train is traveling, a position existing in a purely-lateral direction with respect to a position of a generation source of the disturbance wave. A feature extraction unit (1604) extracts a feature of a measured reception power value being a reception power value measured in the train during a disturbance wave generation period wherein the disturbance wave has been generated. A candidate distance extraction unit (1605) extracts, from learning data indicating a plurality of candidate distances being candidates of a distance between the position of the generation source of the disturbance wave and the estimated purely-lateral position, and indicating for each candidate distance, a feature of an estimated reception power value estimated to be measured in the train when the distance between the position of the generation source of the disturbance wave and the estimated purely-lateral position is the candidate distance, a candidate distance for which the feature of the estimated reception power value matches the feature of the measured reception power value, as an extracted candidate distance. A generation source position estimation unit (1606) estimates a position being distant from the estimated purely-lateral position by the extracted candidate distance, as the position of the generation source of the disturbance wave.