Backup Train Localization Using Beacon Data During Signal Faults
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Solution Overview
Problem
Current communication-based train control systems face challenges in precise train localization, particularly when equipment faults occur, limiting operation and transferability across lines, and failing to accurately locate engineering or special trains.
Innovation Solution
A global train-localization system with a backup localization unit and a GTS server, utilizing independent power and wireless networks, autonomously tracks train location, even in fault conditions, enabling single-line and line-network-level tracking through unified protocols and beacon information processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active reporting or passive detection is used for train localization, then train location can be obtained under normal equipment conditions, but the system cannot obtain train location when axle counter equipment, interlocking equipment, or main carborne equipment has faults
Solution Approach 1:
The system divides the localization function into two independent parts: the existing carborne localization system and the new backup localization unit. The backup unit contains its own processor, memory, and communication module, operating independently from the main carborne equipment. This segmentation ensures that faults in one system do not affect the other, resolving the contradiction by maintaining location acquisition reliability even when primary equipment fails.
Solution Approach 2:
The backup localization unit changes the operational parameters by using a simplified localization method that reads beacon information directly without relying on complex carborne processing. When the carborne system fails, the system switches to using backup unit data, changing the active localization parameter from carborne-processed to backup-unit-processed, thereby maintaining reliability without proportionally increasing overall system complexity.
2Adaptability or versatility
If traditional CBTC localization system is used, then single line or interconnection line train localization is achieved, but train transfer to other lines and engineering train localization cannot be performed
Solution Approach 1:
The backup localization unit is designed with universal functionality to work across multiple lines and for different train types. It reads beacon information using the same mechanism regardless of which line the train is on or what type of train it is (passenger, engineering, or special train). This universal design expands localization coverage without requiring separate systems for each line or train type, resolving the contradiction between adaptability and complexity.
3Reliability
If independent backup localization unit is deployed, then train location tracking reliability is improved under fault conditions, but system cost and complexity increase
Solution Approach 1:
The backup localization unit is essentially a copy of the critical localization functions needed for reliable operation. Instead of creating a completely new complex system, the patent replicates the essential beacon reading and location calculation capabilities in a simplified, dedicated unit. This copying approach provides redundancy and improved reliability while keeping the added complexity minimal and manageable.
Data Source
AI summary
The present disclosure relates to a global train-localization system. The system may autonomously send a precise location of a train to effectively cope with train location recognition in a case of various faults or degradations. The localization system includes: a backup localization unit installed on the train and configured to read beacon location information on a track; and a global train-localization system (GTS) server configured to receive, store and convert train localization information sent by the backup localization unit and to perform output and display. Compared to the prior art, the present disclosure has the advantages of effectively coping with system degradation, namely, tracking the location of the train in real time even in a case of complete fault of a signal system, etc.