SYSTEM ZUR BIDIREKTIONALEN DATENÜBERTRAGUNG ZWISCHEN MEHREREN FESTSTEHENDEN EINRICHTUNGEN UND EINEM FAHRZEUG

摘要

A system is proposed for bidirectional electromagnetic transmission of data signals between at least two fixed stations and one mobile station. The fixed stations transmit the data signals to the mobile station synchronously in downlink mode, their carrier frequencies being different. The data signals are transmitted in uplink mode according to the semi-passive transponder principle from the mobile station to the fixed stations. The data signals of the mobile station are frequency-modulated at the different carrier frequencies of the fixed stations. This arrangement achieves an improvement in the reliability of the bidirectional data transmission. A preferred use is for data exchange for systems controlling traffic between fixed beacon devices and moving vehicles.