Train Positioning Balise Data Transmission Inversion
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Solution Overview
Problem
Existing train positioning systems face accuracy issues and increased failure rates due to data disturbances between the balise transmission module (BTM) and the vehicle on-board controller (VOBC), leading to potential emergency braking and reduced positioning accuracy.
Innovation Solution
The BTM periodically transmits balise data to the VOBC, which calculates the train's location based on received data frames containing traveling time, speed, and distance, without requiring data transmission from the VOBC during calculation, enhancing accuracy and resilience to interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the VOBC transmits data to the BTM during location calculation, then the BTM can calculate the central point, but data disturbance causes calculation failure and positioning accuracy reduction
Solution Approach 1:
Instead of the VOBC transmitting data to the BTM for location calculation, the patent inverts the approach: the BTM independently obtains balise information and transmits it to the VOBC. The VOBC then uses its own travel information (speed, time, distance) to calculate the train's location when passing the balise, eliminating the need for VOBC-to-BTM data transmission during calculation and thus avoiding data disturbance issues.
Solution Approach 2:
The BTM performs self-service by independently acquiring balise information without requiring data from the VOBC during the calculation process. The system design allows the BTM to autonomously obtain and transmit balise data, making the positioning process less dependent on inter-component data transmission that could be subject to disturbance.
2Reliability
If the BTM relies on VOBC transmitted data for location calculation, then calculation can proceed, but data loss triggers emergency braking and increases failure rate
Solution Approach 1:
The patent inverts the data flow direction: instead of VOBC transmitting travel information to BTM for calculation, the BTM transmits balise information to VOBC, and the VOBC uses its own stored travel information (speed, time, distance) to perform the location calculation. This eliminates the critical data transmission link that could fail.
Solution Approach 2:
The VOBC pre-collects and stores its own travel information (speed, time, distance) before the location calculation is needed. This preliminary action ensures that when balise information is received from the BTM, the VOBC immediately has all necessary data to calculate the train's location without requiring additional real-time data transmission.
3Measurement precision
If real-time data transmission is used for positioning, then positioning can be performed, but interference reduces accuracy and causes emergency braking
Solution Approach 1:
The patent extracts the critical data transmission step from the positioning process. By having the BTM independently obtain balise information and transmit it to the VOBC (which uses its own pre-collected travel data), the design removes the vulnerable real-time data transmission link between VOBC and BTM that is susceptible to interference and disturbance.
Solution Approach 2:
The VOBC uses a copy of its own travel information (speed, time, distance) that it has already collected and stored, rather than requiring real-time transmission of this data. This copying approach eliminates the need for continuous real-time data transmission during the calculation process, reducing exposure to interference.
Data Source
AI summary
A method for train positioning includes: periodically transmitting, by a balise transmission module (BTM), balise data to a vehicle on-board controller (VOBC) according to a rule; periodically receiving, by the VOBC, the balise data transmitted by the BTM, and periodically obtaining a data frame, the data frame comprising a current traveling time tn, a current traveling speed vn, and a current traveling distance sn of a train; and determining, by the VOBC based on the received balise data and the obtained data frame, a location of the train when the train passes a balise.