A 40 GHz communication link for railway control purposes

The system aspects, the equipment technology and the experimental results of a 40-GHz-Communication System for railway control purposes is presented. The transmission range is split into different transmission areas, employing stationary transceivers units with seperated transmit and receive frequencies. The mobile equipment is switched to the corresponding frequencies by means of a 35-GHz-doppler radar in combination with track installed transponders, defining the limits of the transmission areas. The doppler radar and the transponders are used also for the location of the train. This equipment was incorporated in an existing train control system and proved its qualification.