METHOD OF CONTROLLING PROPULSION

摘要

PURPOSE: To reach a propulsive device to a specified reaching section even when a ground surface is not used for a long term. CONSTITUTION: A transmitting coil 6 whose axis is aligned with the axis of a propulsive body 3 is mounted previously at the front end section of the propulsive body 3 capable of propelling in the ground in a changeable manner in the direction of propulsion while a plurality of receiving coils 8 for receiving electromagnetic waves from the transmitting coil 6 are installed previously at a plurality of places at equal distances from the place which the propulsive body 3 is to reach in a plane 7 orthogonal to the predetermined direction where the propulsive body 3 moves. The direction of the propulsion of the propulsive body 3 is so set that the electromagnetic-wave receiving intensity of each of a plurality of the receiving coils 8 reaches set values respectively.