| 摘要 |
PROBLEM TO BE SOLVED: To make a communication without stopping a ground station position by providing the ground station with a transmission part which has wide-angle directivity. SOLUTION: At the ground station 1, the transmission part 2 which has transmitting elements arranged in a sectorial shape to have wide-range directivity. Consequently, is arranged even while the unmanned truck 3 travels, a communication is possible as long as reception parts 4a and 4b of the unmanned truck 3 are positioned in the wide-range communication area of the transmission part 2, and the unmanned truck need not stops to have a communication with the ground station 1. In this case, the unmanned truck 3 possibly fails to communicate since it can not stop in the communication area owing to its travel inertia even when bracket on receiving a stop instruction from the transmission part 2. For the purpose, the unmanned truck 3 is equipped with two reception parts 4a and 4b at the front and rear parts of the side part facing the ground station 1. When the front reception part 2a enters the communication area of the transmission part 2, the vehicle is reduced in speed once the stop instruction is given and the truck is so stopped that the rear reception part 4b is positioned in the communication area. |
