Safety relevant application of satellite based localisation in transportation with the focus on railways.
2015 International Association of Institutes of Navigation World Congress, Prague, Czech Republic, Oktober 2015. IAIN, IEEE.
With the general applicability of satellite based
localization systems (GNSS) and satellite based augmentation
systems (SBAS) proven the way is paved for safety relevant
applications in railways. Secondary lines currently equipped with
no or only a not up-to-date train control system can benefit from
satellite based train localization like the currently introduced
European train control system (ETCS). Thus the efficiency of
operation can be increased including the reduction of costs for
This paper considers the requirements of trains running on
different track categories resulting in an application fitted system
design with a development strategy leading to an according safety
case and safety assessment. The migration from existing systems
to satellite based localization on the one hand and from one level
of ETCS without satellite based localization (e.g. level 2) to a level
with satellite based localization (e.g. level 3 or higher) is
considered as well.
The components of satellite based localization which shall be
used for the safe train localization are of high quality but are not
certified according railway standardization. After taking into
account the normative background of the targeted application
domain – railways – and the originating domain of the equipment
– satellite based localization – a solution is suggested to include
the localization equipment as industrial components. The safe
localization will be reached by the redundant combination of
sensors and the use of a safe controller. This design takes into
account the requirements towards the functions, the product and
the mounting place of the localization unit on the train.