Marais, J.; Poliak, J.; Hänsel, F.:
Tools for validation and acceptance of GNSS solutions in rail.
Proceedings of the ENC-GNSS 2007, Geneva/Switzerland, Mai/Juni 2007.
Localisation information is used in many railway typical applications: for track, fleet or wagons management as well as
for level crossings and many others. This function is provided by infrastructure equipments. However, in the context of
European harmonization but also of saving costs (in particular to make low density traffic lines survive) GNSS (Global
Navigation Satellite Systems) are wished to answer some of the railway localisation requirements.
In order to introduce this technology, many applications have been developed over the last few years in this sector and
supported by European Commission and national programs. They integrate and use available as well as innovative
technologies with the main focus on satellite based positioning (GPS and EGNOS already available, GLONASS and
GALILEO under re-deployment and development).
But this introduction will not be possible without any validation of the performances. The basic idea that will be
developed in this paper consists of developing generic reference measurement platforms for the evaluation and
validation of applications in the respective transportation sector.
The upcoming European satellite based localisation system Galileo will provide five different services with different
performances and characteristics that will be suitable for different ranges of applications. These services will be: Open
Services, Safety of Life Services, Commercial Services, Public Regulated Service and Rescue Service. The Safety of
Life Service is the key service for most safety related applications due to its guaranteed characteristics of integrity,
availability and accuracy.
For the concrete validation or testing of applications and services, it is expedient to conclude simulation tests with an
evaluation of the real system . For this evaluation, the environmental conditions of the real operation have to be met
as good as possible (or sensible) to make the results significant. For this, adequate reference platforms have to be set up
and used. These platforms have to offer a very accurate positioning system independent from the positioning systems
In this paper, we will first introduce what kind of applications can benefit from Galileo before presenting a
methodology devoted to validate the performances in the particular railway environment. An experimental platform is
developed that will be presented in the last part, before conclusions