Recently, extensive research and development of the non-stop electronic toll collection system has been energetically promoted. The advantages of this system are that it can minimize traffic congestion near toll gates, reduce the work load of toll collectors and realize cashless toll collection. The wireless system uses a radio tag (On Board Unit, referred to as "OBU") mounted on a vehicle, together with the Roadside Unit ("RSU") to record the toll information on each vehicle in OBU by communicating with the interrogator antenna, and builds a prepaid system. However, whereas it is necessary to perform radio communication within a limited time and in a limited communication area, to read the information from the OBU and write the toll information without stopping the vehicle, the process time required greatly affects non-stop travel. This should be the largest benefit of the non-stop automated toll collection system. The authors have developed the system for communication between the OBU and the RSU at 1 Mbps with the carrier in a 5.8 GHz band using a narrow directive antenna. This report describes the configuration of the system and the result of experiments which were conducted. Based on the simulation technique established in the experiment in a 2.45 GHz band, it has been confirmed that communication is possible at a maximum vehicle speed of 515 km/hr.
Abstract