Satellite-based train positioning has been an important focus for new generation railway train control systems. The Virtual Balise (VB) technology enables a compatible solution for introducing Global Navigation Satellite System (GNSS) into a train control system under the existing system specification framework. The VB capture operation requires accurate and reliable position information of the train, even under complicated and challenged operation environments. In this paper, the key logic of the Safety Qualifier Module (SQM) in the VB scheme is investigated. Using the integrity concept, specific detection and isolation logics are presented at both the GNSS observation level and the sensor fusion level. By actively adjusting the positioning calculation structure according to the quality inspection of the GNSS measurements, the qualification criteria can take advantage of the integrity report of the positioning result, which guarantees the dependability of GNSS-based VB capture for the train control purpose. Results from the filed data and simulation demonstrate the capability of the presented solution, which illustrates the advanced VB capture performance under specific GNSS observation scenarios.
Quality Monitoring and Diagnostics of GNSS-enabled Virtual Balise Capturing using an Integrity Concept
01.09.2022
670379 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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