Ionospheric incremental delay models in railway applications

The paper focuses on the introduction of the GNSS technology into the frame of the train control system. The goal of this work is to analyse and compare the existing ionospheric incremental delay models influence on accuracy of On Board Unit (OBU) position to verify the achievable performance by adopting them during the estimation procedure. The performance results will be shown, based on a campaign test acquired on a ring-shaped highway (named Grande Raccordo Anulare (GRA)) around Rome (Italy) to simulate movement of a train on a generic track.