The GALILEO Safety of Life Service (SoL) - Level A has been designed to meet aeronautical safety requirements ranging from En-route operations up to APV II (Approach with vertical guidance). Excepting this, it is also intended to use the SoL service Level A for railway signalling applications. In spite of fundamental differences between the ICAO's (International Civil Aviation Organization) Required Navigation Performance (RNP) concept and railway safety philosophy, it is important to understand how exactly Global Navigation Satellite System (GNSS) quality measures (i.e. accuracy, integrity, continuity and availability) can be used for design, validation and verification of railway safety related systems. The objective of this paper is to describe links among the GNSS quality criteria and the quality attributes of railway signalling systems RAMS (reliability, availability, maintainability and safety) according to the CENELEC standards EN 50126, EN 50129 and EN IEC 61508. The paper starts from analysis of ICAO's RNP safety targets definitions. Subsequently there is investigated a way to include the GNSS quality measures among railway RAMS. The fundamental features of GNSS quality measures are described in terms of reliability/unreliability first. Then the quality measures are classified by means of probabilities of failure modes with consideration of diagnostics in order to show how they can be used in formalization of railway safety concept GNSS based. The impact of the GNSS quality measures on railway dependability and safety will be shown. This paper provides a basic theory and methodology for employment of the GNSS quality attributes for practical design, validation and verification of railway safety systems based on GNSS. It has been shown that in spite of different safety philosophies used in aviation and railway safety systems, the GALILEO SoL Level A service can be described by means of RAMS terminology according to railway standards


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    Title :

    A relation among GNSS quality measures and railway RAMS attributes


    Contributors:


    Publication date :

    2008


    Size :

    13 Seiten, 9 Bilder, 11 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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