| 摘要 |
PURPOSE:To measure the positions of plural vehicles based upon two reference positions with high accuracy by transmitting azimuth information along with laser light emitted by laser light emitting devices placed at the two reference positions and rotating them in a horizontal plane at a constant speed. CONSTITUTION:The laser light emitting devices 65 and 66 rotate in the horizontal plane at the constant speed at the two reference positions in such a limited area that the direction of a line connecting the two reference position faces in a reference direction, e.g. north, and also emit laser beams which are pulse- modulated with the azimuth information. Then, laser light receivers 63 and 64 which are mounted at prescribed positions on the vehicles 61 and 62 whose positioned are to be measured receive the laser light beams to obtain two pieces of azimuth information on the vehicles 61 and 62. The positions of the vehicles are computed by position arithmetic units mounted on the vehicles from the pieces of azimuth information and obtained position coordinates are sent from radio communication equipments 67 and 68 to a vehicle position controller 71.
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