| 摘要 |
PROBLEM TO BE SOLVED: To specify a floor where a vehicle is present at a parking lot having a plurality of floors and correctly detect a position, by receiving information of electric field intensities from at least three or more PHS(personal handy phone system) base stations and analyzing the information. SOLUTION: When a vehicle 100 passes a parking lot gate, a vehicle tug 114 is read. A port terminal 211 transfers a bar code information of the vehicle 100 to a vehicle management center 300. The vehicle management center 300 selects three PHS base stations near the parking lot which receive an ID information emitted from a PHS device 111. A transmitting receiving part B413 receives IDs of base stations and an electric field intensity information of the received information from the PHS device 111 and sends to a position-detecting means 412. In order to detect a position of the vehicle, for instance, a distance from one of the PHS base stations is determined by the electric field intensity of the received information from the PHS device 111 and a spherical surface with a radius of the distance from the PHS base station is plotted. An intersection of a plurality of spherical surfaces is obtained, which is decided as the position of the vehicle. |
