| 摘要 |
PURPOSE:To measure the positions of plural vehicles based upon one reference position with high accuracy by sending azimuth information together with laser light emitted by a laser light emitting element placed at the one reference position and rotating it in a horizontal plane at a constant speed. CONSTITUTION:The laser light emitting device 40 rotates in the horizontal plane at a constant speed at the prescribed reference position in a limited area and emits a laser light beam which is pulse-modulated with the azimuth information. Laser light receivers 63 and 64, and 65 and 66 capable of receiving light in every direction are placed at prescribed positions on vehicles 61 and 62 whose positions are to be measured. Those light receives 63 and 64, and 65 and 66 receive laser light beams to obtain two pieces of azimuth information on the veicles 61 and 62. Further, azimuth measuring instruments mounted on the vehicles 61 and 62 obtain information on directions connecting the light receivers 63 and 64, and 65 and 66. The obtained pieces of information are processed by CPUs on the vehicles and sent as position information on the vehicles 61 and 62 to a vehicle position controller 71 from radio equipments 67 and 68.
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