抄録
DSRC (Dedicated Short Range Communication) for VICS (Vehicle Information and Communication System) in Japan is composed of infrared beacons which are located along urban road and quasi-microwave beacons which are located along expressway. Its service has started since April 1996. While passing through the different two types of DSRC zones, it is required to maintain interoperability for the navigation system. Furthermore, it is desired to be easy installation of OBU (On-Board Unit). A multimedia OBU which ensure to amoothly communicate with the different types of beacons by using coprocessing procedure has been developed. This OBU also enable to be easily installed to the vehicle by using the multiplexing technique that the different types of DSRC signals and DC power supply are multiplexed on an one coaxial cable which connects with a head unit and a control unit.
