Train Event Location Refinement Using Reference Point Databases
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Solution Overview
Problem
Current methods for locating train events on a railway network face inaccuracies due to limitations in GPS measurement accuracy and event recording timing, making it difficult for operators to understand the relationships between events and infrastructure.
Innovation Solution
A method that uses a reference point database and a relationship database to specify the location of train events relative to network infrastructure, adjusting the event location based on distance thresholds and adjustment vectors, without requiring improved measurement accuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS or odometer locators are used to record train event locations, then event mapping can be implemented, but measurement accuracy is limited to 5-100 meters which is insufficient for precise infrastructure location identification
Solution Approach 1:
The patent introduces an intermediary processing system that receives imprecise GPS/odometer location data and refines it by comparing with reference point locations in a database. The system calculates distances between the recorded event location and multiple reference points, then identifies the closest reference point to determine the precise infrastructure location, effectively mediating between crude measurement data and precise location identification
Solution Approach 2:
The system changes the parameter of location representation from raw GPS coordinates (with 5-100m accuracy) to reference point identifiers and offset distances. By transforming the location data into a database-queryable format and using distance calculations, the system converts imprecise measurements into precise infrastructure associations
2Productivity
If event location data is recorded with variable time delays, then event recording can be implemented, but timing accuracy deteriorates causing inaccuracies in recorded event locations
Solution Approach 1:
The system performs preliminary actions by establishing a comprehensive database of reference point locations and types before processing event data. This pre-prepared reference framework allows the system to quickly match and identify infrastructure locations even when event recording experiences variable time delays, as the spatial relationships are already established
3Ease of operation
If operators rely on imprecise event location mapping, then system operation can continue, but understanding of relationships between events and infrastructure deteriorates
Solution Approach 1:
The system provides feedback by comparing the recorded event location with the database of reference points and identifying the closest match. This feedback mechanism continuously refines the location information by iterating through distance calculations and selecting the best match, thereby recovering lost relationship information between events and infrastructure
Data Source
AI summary
A method of locating train events on a railway network is provided. The method includes the steps of: providing a reference point database which specifies locations of reference points on the network, the reference points being of different types, and the reference point database further specifying the respective type of each reference point; providing a relationship database which relates different train events to respective reference point types, for each combination of a train event and a related reference point type, the relationship database specifying a distance threshold criterion for the reference point type relative to a location of the event, and a reference point adjustment vector which specifies a distance from a reference point in a given direction on the network; receiving an event report for a train operated on the network, the report identifying a train event and imputing a location of the event on the network; comparing the event report with the reference point database and the relationship database to identify a reference point on the network which is of a type related in the relationship database to the train event of the event report, and which has a location on the network relative to the imputed location which satisfies the respective distance threshold criterion; and specifying the location of the train event of the event report to be the location of the identified reference point adjusted by the respective reference point adjustment vector.