COMMUNICATION DOMAIN RESTRICTING DEVICE FOR ETCS TERMINAL

摘要

A communication domain restricting device for an ETCS (Electric Toll Collection System) terminal of an OBU (On Board Unit) having an antenna, an RF receiving unit, an RF transmitting unit, and a baseband transmitting/receiving unit, includes an OBU receiving performance restricting unit arranged at a receiving end of an ASK (Amplitude Shift Keying) demodulator of the RF receiving unit. The OBU receiving performance restricting unit includes a digital control block and an RSSI control block which operate to restrict the receiving performance of the OBU such that transmission or reception can be performed only in a communication domain of a predetermined range. The communication domain restricting device of the present invention overcomes the drawbacks of noises which degrade performance of ETCS in a region other than the communication domain and the deterioration of the efficiency of switching between reception and transmission when the OBU enters the communication domain.