Wireless Communication System for Unmanned Underwater Vehicles using Optical Laser Link

• Main Authors: Tai-Ching Tang, 唐泰清
• Other Authors: 郭振華
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/64025091827836560977

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 103 === An underwater wireless optical communication system that adopts laser and LED as the transmission medium is demonstrated. It serves as a short-distance and full-duplex wireless communication interface between underwater vehicles and humans in a shallow or narrow water environment where acoustic waves show unsatisfied communication performance. This system has two parts: static node and autonomous underwater vehicle node. They all adopt PIN photodiodes as optical receiver. The former uses the high power LED as its transmitter, and the latter was equipped a structured light system which includes a camera for structured light detection and the auxiliary navigation and control for the connection between the two nodes. These nodes connect each other with optical waves using On-Off Keying modulation method to carry data packets. The packets are the result of improved x-modem protocol that is constructed by Reed-Solomon code and Manchester code to reduce the probability of error bit happening during transmission. Finally, experiments were conducted in a water tank to prove the packet error rates (PER) can be satisfactory and the feasibility of a guidance system for communication.