| 摘要 |
A DSRC car-mounted equipment reliably preventing communication error in the communication area, comprising a communication control unit 11 for transmitting and receiving data by radio to and from an on-the-road equipment, a radio detector unit 12 for detecting signals received from the on-the-road equipment by detecting the electric field intensity E, and a microcomputer (10A) for fetching output signals from the radio detector unit by controlling the communication control unit to process data included in the received signals, wherein the microcomputer includes an input interface for receiving data Vr related to the speed of the vehicle, and communication area-setting means for variably setting the radio communication area depending upon the vehicle speed data, and wherein the communication area-setting means contracts the communication area when the vehicle speed data represents a low-speed state and expands the communication area when the vehicle speed data represents a high-speed state.
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