A METHOD OF CONTROLLING AND POSITIONING A MOVABLE OBJECT, AND A SYSTEM FOR PERFORMING THE METHOD

摘要

In a method, a movable object is controlled by means of a communications connection containing an antenna (1) which is arranged on the object and in which a current is fed, so that the antenna emits a magnetic field. Further, the communications connection contains one or more transmitter units (4) which are arranged to receive and to reflect signals from the antenna. The magnetic signal strength is determined as a function of the distance between the movable object and one of the transmitter units (4), and the places where the magnetic field has the value 0 or another threshold value are used as fix points. The method may e.g. be used for controlling the pattern of movement of driveless trains and to position these, as the information signals may contain start, move and stop commands. In a preferred embodiment, the stop command is executed so that e.g. said fix point is used as a starting point for the position of the stopping, but that the actual stopping takes place at a distance from the measured fix point. Further, a system for performing the method and comprising a group having at least two transmitter units is disclosed.