One of main difficulties complicating consistent evaluation of Galileo applicability for railway safety related systems is absence of a clear methodology for 'translation' of the existing Galileo Signal-In-Space quality measures (i.e. accuracy, integrity, continuity and availability and related metrics) to the railway dependability and safety measures according to the railway safety standards EN 50126, EN 50129, etc. Therefore, the main objective of this paper is to respond to some fundamental questions concerning utilization of the Galileo SoL SIS quality measures for railway signalling systems and provide assessment, what can railways expect from the Galileo SoL service. The paper starts with a briefly described derivation of ICAO's RNP's Target Level of Safety (TLS) and related terms for the average duration of the flight. The derivation starts from the statistical data of accidents for the given time period and the safety requirements are expressed as the acceptable probabilities of dangerous failures per duration of the specific flight operation. Fundamental railway safety principles according to EN 50126, EN 50129 are briefly outlined in terms of the functional and technical safety. In order to achieve, maintain and guarantee the required level of safety, a systematic methodology, consisting of the Risk Analysis (Railway Authority's Task) and Hazard Control (Supplier's Task), must be used according to the EN 50129 standard. In order to translate GNSS SIS quality measures to railway safety terms, it is necessary to understand first what is, and what is not a failure, and how SIS failures can be classified. Consequently, the SIS integrity and continuity risks are described by means of the failure modes. The rest of the paper deals with the interpretation of the Galileo SIS quality measures to the railway safety metrics. Their inclusion among the railway dependability and safety attributes and their influence on the railway safety and dependability measures is discussed.
Differences between aeronautical and railway safety concepts based on the Galileo SoL service
Unterschiede zwischen Luftfahrt- und Eisenbahnsicherheitskonzepten basierend auf dem Galileo-SoL-Service
2007
16 Seiten, 13 Bilder, 2 Tabellen, 12 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Safety concept of railway signalling based on Galileo Safety-of-Life Service
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