| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a narrow area radiocommunication system capable of making an error of accounting against a tollgate-passing vehicle less by making an influence caused by a reflection and a leakage to an adjacent traffic lane loss. SOLUTION: When a vehicle approaching to a tollgate lane is detected by a vehicle detection part 3, a detection signal is fed to an ETC control part 6. A high frequency part 2 is controlled by controlling a wireless control part 3 from the ETC control part 6 by a processing state of an application to make to a transmittable state of a carrier wave and the ETC control part 6 simultaneously feeds a transmission control signal 7 to an antenna part 1 at a road side and the carrier wave is transmitted to a vehicle by a normal processing of the application. When the application is normally completed, a transmission control signal 7 is outputted from the ETC control part 6 to the antenna part 1 at the time of the completion and a transmission of the carrier wave from the antenna part is stopped. The ETC control part 6 simultaneously carries out an accounting of the vehicle against an accounting part 5.</p> |
