| 摘要 |
PURPOSE:To evade correspondence contention by applying correspondence control among plural mobile bodies based on identification information. CONSTITUTION:Analog signal fV, fR received by an antenna 204 are subject to band limit by band pass filters 205,206 to eliminate an undesired harmonic/low frequency and amplifiers 207, 208 form an amplifier signal of a required level possible for demodulation. Then a switching control signal is sent to a received two-wave changeover switch 210 to input only one wave to a demodulation circuit 211, where the signal is demodulated into a digital data and given to an MPU 200 via a communication control LSI 212. On the other hand, in case of the transmission to an on-road equipment/other vehicle, the digital data generated by the MPU 200 is converted into an analog signal by an MSK modulator 213 via the LSI 212 and amplified by an amplifier 214, then sent via the antenna 204. Thus, the contention of correspondence due to the duplicated correspondence between mobile bodies is evaded. |
