Patent ID: 7062239

Claim:
An on-vehicle equipment for Dedicated Short-Range Communication (DSRC) in an Intelligent Transport System (ITS) comprising: a receiving antenna for receiving a radio wave signal transmitted from on-road equipment; a frequency converting unit for converting a receiving frequency for the radio wave signal to a predetermined local frequency among a plurality of local frequencies; a channel selecting filter unit for filtering a signal received at the predetermined local frequency to obtain only a signal in a predetermined channel; a demodulator for digitizing the predetermined channel signal obtained by the channel selecting filter unit; a normal reception determining unit for judging whether the radio wave signal is normally received based on an output from the demodulator; a phase locked loop (PLL) oscillating unit for outputting the predetermined local frequency to the frequency converting unit according to a selected frequency signal; and a frequency switching determining means for selecting the predetermined local frequency, generating the selected frequency signal by sequentially switching the local frequencies at a predetermined cycle in accordance with a preset priority sequence for switching the local frequencies corresponding to different types of on-road equipments, comparing a receiving frequency signal generated based on the frequency of the received radio wave signal with the selected frequency signal, and setting the local frequency output from the PLL oscillating unit if the receiving frequency signal and the selected frequency signal are equal.