Safety Concept Of Railway Signalling Based On
Galileo Safety-of-Life Service
Author(s)
A. Filip, J. Beugin, J. Marais & H. Mocek
Abstract
The Safety-of-Life (SoL) Service - Level A of the satellite navigation system
Galileo has great application potential for both aviation and railway safetyrelated
systems with view to reduce operational, investment and maintenance
cost. In aviation sector, radio navigation has been widely used for safety
applications for several decades. That’s why main quality requirements regarding
the Galileo Signal-In-Space (SIS) SoL service - Level A, such as accuracy,
integrity, continuity and availability, were taken from aviation ground radio
navigation systems. However, different safety philosophies used in aviation
domain and in railway signalling complicate direct employment of the Galileo
quality measures to railway safety applications.
The objective of this paper is to show, what are fundamental differences
between aeronautical and railway safety philosophies from view point of Global
Navigational Satellite System (GNSS) applications, how the Galileo SIS quality
measures were derived, what is their practical meaning and how it is possible to
employ them for practical design of a safe Train Position Locator (TPL).The
safety assessment starts from classification of Galileo SIS integrity and
continuity risks by failure modes. It is shown how integrity and continuity risks
influence railway safety and what impact these risks have on dependability of a
safety-related system. The interpretation of the Galileo quality measures in terms
of RAMS (Reliability, Availability, Maintainability and Safety) according to the
standard EN 50126 is proposed. Finally, the practical application of the Galileo
quality measures for safety assessment of a TPL is demonstrated.
Keywords: GPS, GNSS, LAAS, RAMS, Galileo Safety-of-Life Service, continuity
risk, integrity risk, satellite navigation, railway safety, signalling, train control.
Keywords
GPS, GNSS, LAAS, RAMS, Galileo Safety-of-Life Service, continuity
risk, integrity risk, satellite navigation, railway safety, signalling, train control.
Related Book
Other papers in this volume
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