Abstract
Water transportation plays an important role to maintain the sound and rapid economic development in the world. As the number of ships increases rapidly, every busy port need an efficient and intuitive navigation system to pilot the ship in and out of the harbor. A visual navigation system consists of three colors LEDs is proposed for sailing. By optimizing the collimation of high-power LED lamp with a rectangular concentrator and Fresnel lens, it outputs a rectangular light spot with a narrow navigation area. Furthermore, by adopting three color LEDs, the navigation area is divided into three areas in the horizontal direction, where the primary guiding path is the middle one. By navigating a motor boat on an inner lake, the feasibility of this system is demonstrated experimentally. The experimental results show that the colors of the three areas can be easily distinguished as far as 2 km, and the navigation system can assist sailors to adjust the sailing route efficiently even they sail along a complicated route.
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