The Eurobalise is a passive transponder that is powered by the train. It transmits either locally stored telegrams or telegrams provided by the line-side electronic unit (LEU) dependent on the railway signal aspect. Those telegrams inform the train about signals, speed limits and track conditions.
When the train crosses a Eurobalise, the Eurobalise is tele-powered by BTM and transmit a telegram which is received by the BTM. After reception the telegram is processed and passes to the train control computer, called the European Vital Computer (EVC). The EVC provides cab signaling to the driver, Furthermore, it continuously monitors the train speed and, if necessary, applies the service brake and/or the emergency brake to guarantee the safety of the train.
MERMEC diagnostic system is able to check the operating conditions of the Eurobalise, detecting any possible anomalies in the ground plants (i.e. degraded balise). Moreover, the diagnostic system tele-powers the Eurobalise processing the telegram received. It acquires and digitizes the major lobe of the balise radiation pattern as well as registers the "length of contact" intervening between the balise interception and the bit stream receipt (telegram acquisition).
The diagnostic system "Acquisition and Processing Unit (AUPU)" is able to measureevaluate:
|Definition of ETCS (European Train Control System)||An automatic train protection system (ATP) to replace the existing national ATP-systems; ETCS is one of the two basic components of the European Railway Traffic Management System (ERTMS).|
|Definition of SCMT (Sistema Controllo Marcia Treno)||An ATP (Automatic Train Protection) system used to protect the train while running with reference to the signal conditions, maximum velocity allowed by the railway line and that allowed by rolling-stock.|