| 摘要 |
<p>The communication over the whole region of a wide working site can be performed without cost increase owing to the installation of auxiliary equipment, and mutual control of vehicles can be performed sufficiently with a light burden on a monitoring station and without sacrificing the safety. Further, when a fault occurs in transmission/reception equipment, the fault can be confirmed quickly and securely, and accordingly the abnormality can be dealt with quickly and properly. First transmission/reception means which transmit/receive at least command data between the monitoring station and a plurality of vehicles by a 1st communication system which enables wireless communication over the distances between the monitoring station and the vehicles are provided in the monitoring station and the vehicles respectively. Second transmission/reception means which transmit/receive position data which are measured by vehicle position measuring instruments between the vehicles by a 2nd communication system which enables wireless communication over the distances between the vehicles and enables faster data transmission/reception than the 1st communication system are provided in the vehicles respectively. The position data are transmitted between the vehicles by the 2nd transmission/reception devices to make the respective vehicles know the approach of other vehicles. Thus the mutual position relations between the vehicles can be monitored.</p> |
