scope:

The civil applications of geopositioning are undergoing exponential development. The latest market analysis for the GNSS systems shows 2 major fields of application which, all together, practically share the whole of the market. • Intelligent Transport Systems (ITS), mainly in the Road ITS domain. • Location Based Services (LBS), accessible on smartphones and tablets. When a Road ITS system needs GNSS positioning, which is the case for most of them, there is the question of the choice of the type or receiver and of its minimum performances which are necessary to satisfy the system's final requirements at user level. To meet these requirements, the system includes a processing Application module which uses the outputs (PVT = Position-Velocity-Time) of a GNSS-based terminal1 to provide the service with a given End-to-end performance. Consequently, this latter depends on the quality of the positioning outputs, which are highly variable with respect to the operational conditions of the system, but also on the performance of the application module itself. The main ITS systems concerned by this issue are: • GNSS-based tolling systems (road, parking zone, urban…) • Localized emergency calls (eCall) • Electronic tachograph • Taximeter • Regulated freight transport systems (hazardous substances, livestock, etc.) • "Pay-as-you-drive" insurance • Road management systems, traffic information systems, • Advanced Driver Assistance Systems (ADAS) • etc. Some Road ITS systems are considered as "safety critical", because their failure may cause human death or injury and others are "liability critical", because they include financial or regulatory aspects. In some cases, their development is subject to an official certification/homologation process. Particularly for those systems, there exists a strong need to be able to prove they do meet their End-to-end performance requirements. Presently there is no norm or standard that supports such certification process, while in parallel, the assessment of GNSS positioning performances is by nature difficult to handle. The objective of this EN is to fill this gap, by providing an approach for handling performances aspects of Positioning-based road ITS systems, that differentiates clearly the role played by the Positioning terminal and by the Application module respectively. It provides with standard definitions of performance metrics for the outputs of the GNSS-based positioning terminal, relevant for road ITS, definitions of the various items to be considered when specifying an Operational scenario together with a method to characterize an environment, and finally procedures to reconcile tests results on the different system components to assess the system End-to-end performances.