Wireless Communication System for Unmanned Underwater Vehicles using Optical Laser Link
Date Issued
2014
Date
2014
Author(s)
Tang, Tai-Ching
Abstract
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.
Subjects
underwater wireless optical communication
underwater vehicle
underwater technology
Type
thesis
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