| 摘要 |
A robotic system comprises a transmitter emitting a plurality of angularly-spaced beams of radiation in an area; and a robot moving within said area and able to detect when it is in the path of one of said beams. On moving through a measured distance across the paths of two or more of the beams, the robot can determine the relative position of the transmitter and the robot by using the distance and the angular spacing of the beams.
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