| 摘要 |
A device for positioning one end of a movable bridge (1) in relation to a door (20) on a craft (21) comprises a control unit (7) for controlling at least the vertical movement of the bridge (1) and for storing information on the position of the door (20) on the craft. The control unit (7) comprises a sensor (8) arranged to transmit electromagnetic radiation in different directions, and to detect electromagnetic radiation; and the control unit is arranged to measure the time difference between the transmission of radiation in at least two different directions and the detection of said radiation, thereby determining the position of the bridge (1) in relation to the craft (20) in said directions, and to control at least the vertical movement of said one end of the bridge (1) to a position adjacent to the door (20) in response to the determined position of the bridge (1) and the stored information on the position of the door (20).
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