Highlights ► The challenges to use satellite technologies in railway safety systems are exposed. ► We focus on dependability and safety properties given signal propagation problems. ► An approach to evaluate these properties for the localization function is proposed. ► The results show the impact of the function for different railway environments.

    Abstract Satellite-based localization technologies are strategic opportunities in railway applications because they offer new possibilities of service and have advantages that current technologies relying mainly on infrastructures deployed along tracks cannot equal. GNSSs (Global Navigation Satellite Systems) can, in particular, offer localization services in ERTMS (European Rail Traffic Management System), the system developed within the European railway community to harmonize, at European scale, railway signalling and control/command systems. However, using GNSS in such safety applications is slowed down when trying to comply with railway standards. Indeed, demonstrations of RAMS properties (Reliability, Availability, Maintainability, Safety) are required on new solutions embedded in trains. They aim at verifying if all dependability (RAM) and safety aspects are controlled over the lifecycle of the solutions before using them operationally. No RAMS evaluation technique exists for systems based on signal propagation and subject to failures provoked by environment effects. The major challenge is so to develop proof methods that will give means to fulfil the railway certification process. In this article, we propose a procedure to work in that direction after having presented the advantages, the possibilities and the challenges to use GNSS in rail transportation. The procedure is based on experiments for the evaluation of RAMS properties related to satellite-based localization units. We apply the method to different position measurements obtained in several typical railway environments. The obtained results are discussed according to the dependability and safety points of view.


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    Title :

    Simulation-based evaluation of dependability and safety properties of satellite technologies for railway localization


    Contributors:


    Publication date :

    2011-12-02


    Size :

    16 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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