| 摘要 |
Antennas 1a and 1b are located above each lanes of the road so that the antennas can communicate with mobile stations which are loaded on vehicles that approache the toll gate along each of the lanes. When a vehicle approaches the toll gate, a beacon detects the vehicle and requests an ID signal toward the mobile station that is loaded on the vehicle. In response, the mobile station transmits an ID signal on a radio frequency toward each of the antennas. Then, the beacon receives the ID signal with each antenna, and analyses the signal voltage levels. Then, the beacon selects an antenna which provided the highest voltage signal, and proceeds communication between the mobile station with the antenna of the highest level. <IMAGE> |
