| 摘要 |
PURPOSE:To evade a time and a labor from being much consumed for detecting a vehicle by polling a sign post within a prescribed range based on the position of a sign post if retrieval of a vehicle is disabled even when a sign post of a coordinate is selected. CONSTITUTION:Suppose that a sign post A of a coordinate (x=120,y=120) is selected at first to apply polling command. If an object vehicle exists in the area, a reply from the vehicle is awaited and corresponded. If no reply comes from the area, the coordinate of the sign post is expanded based on a coordinate (x=120,y=120) of the initial sign post A and sign posts A - F,L are selected and polling is applied to the sign posts. If an object vehicle exists in the area of the sign post of the special coordinate, since the surrounding area is designated altogether and the vehicle is found out, the system is excellent in the operability and the vehicle is detected in a short time. |
