| 摘要 |
A ship locates itself by means of a beam of pulsed laser light, rotated about a vertical axis, which impinges on retroreflectors placed at fixed positions or on other vessels. An optical assembly for this purposeincludes a pulsed laser, a lenticular lens producing a vertical fan beam of light 18 and vertical photodiode array 32 comprising a plurality of photodetectors Rx, Ry,Rzdetecting laser light 28 that has been emitted by the laser and reflected by a retro -reflective target 22 towards thephotodiode array 32. The level of reflected laser light incident upon each photodetector detected, and, based on these, an actuator varies the inclination of the optical assembly to keep the light beam directed in a plane including the retroreflectors despite the yaw and pitch movement of the boat. |
