Development of Underwater Transmission System

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Marine environment is recognized one of the most important factor in relation with abnormal climate. The investigation of marine and underwater are increased around the world. We have researched about the useful system of marine development.The following are our results in this research.(1) The acoustic characteristics of large-size anecoic tank is measured in order to evaluate the propagational properties. The results show the efficiency of the anechoic tank.(2) The underwater transmisson system using FSK modulation method is developed. The system can control the remotely operated vhehicle (ROV) at 150bps in the anecoic tank. The system can communicate the data between the mothership and underwater vehicle away about 200m in the sea.(3) The compact autonomous underwater vehicle (AUV) is developed in order to survey the closed sea marine environment and marine creature. The vehicle can navigate autonomouly using the depth sensor, collision avoidance sonar, and depth sensor. We have made a compact and light weighted autonomous underwater vehicle by employing the variable vector propeller.(4)We developed the 3-D SSBL (Super Short Base-Line) positioning system in order to measure the distance and direction between the mothership and underwater vehicle. The system can measure acculately.(5)The recognition system of the fish species is realized using morphological filter. The system can recognize the pilchard sardine, macherel, and Japanese horse macherel within 90%.