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A real sea survey result of sea floor at Middle Okinawa Trough by a hovering type AUV (Autonomous Underwater Vehicle) HOBALIN is reported. The depth of the survey target area is almost the intended limit of the AUV and it was the first time for the AUV to dive down to that depth since the AUV dived first time into the real sea almost one year ago. The operation of the survey with the AUV was done...
We have developed a semi-submersible ASV (Autonomous Surface Vehicle) that tracks and controls AUVs (Autonomous Underwater Vehicles) on behalf of the mothership. In September 2016, we conducted tracking, positioning and communication tests of multiple AUVs by using the ASV. The results of the trials proved the performance as designed. And the ASV succeeded the test of each AUV tracking and multiple...
A new complex system of underwater positioning and communication has been developed for control of multiple autonomous underwater vehicles (AUVs). It consists of a semi-submersible autonomous surface vehicle (ASV), a hovering type AUV, and three surface buoys. The operational concepts for control of multiple AUVs are discussed.
This paper describes the design of a newly-developed Autonomous Underwater Vehicle “HOBALIN” by National Maritime Research Institute, Japan. The major mission of the AUV is to explore hydrothermal vents by taking photographs hovering over the seafloor at an altitude of 2–5 meters, up to 2,000 meters depth. “HOBALIN” was developed as a practical AUV based on the design of the AUV “TUNA-SAND”. Therefore,...
Autonomouse underwater vehicles(AUVs) are vital tools for detailed ocean survey in recent years. Amongst them, hovering-type AUVs are specialized in optical observation using cameras and travel near the seafloor avoiding obstacles. Therefore, it is important to maintain proper distance between AUV and objects which should be approached to take pictures.
A new autonomous surface vehicle (ASV) has been developed for control of multiple autonomous underwater vehicles (AUVs). Because it is semi-submersible type, the attitude in the sea surface waves is stable though the size is smaller than typical ASV. The cruising speed (3 kt) is confirmed in the testing basin. The operational concepts for control of multiple AUVs are discussed.
This paper suggests a data compression method for transmitting data having knowledge of some approximate value of the data to be sent, and shows some application examples of the method to transmission of position data. The key idea of the method is that MSB (Most Significant Bits) do not have important information when we know the approximate value, and we can drop it from the data to be sent. Applying...
Seamless transfer of electronic information/data between ship-to-shore and vice versa and between ship-to-ship and shore-to-shore is being developed in the IMO e-Navigation strategy implementation plan (SIP). We have been focused on wireless LAN for ship-to-ship radiocommunication.In a former field radiocommunication trial, omni-directional antennas were used and a few hundred kbps throughput between...
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