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摘要

The laser is calibrated with the distance between the laser and the ground at some of the angles at which laser pulses are emitted. During positioning of the airplane (4) the laser measures the distance at these angles and this data is compared with the calibrated distances in a computer associated with the distance measuring device (1), to ensure the correct distance is measured. Distance is measured by a non-contact method using a scanning laser associated with the distance measuring device. The laser is pointed towards a region on a central axis along which the airplane is to be moved during positioning. The laser sends out measurement pulses at different angles in a stepwise manner. An Independent claim is also included for the distance measuring device.