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In out research program, research and development on a long cruising autonomous underwater vehicle (AUV) are promoted. In such AUV operation, it is very significant to establish acoustic communication even at low data-transmission rate. Time-reversal techniques have a possibility to realize such long horizontal communication, which converge multipath signals to the focus, decrease intersymbol interference...
Recently, a number of bacteria including new one have been found from mud samples of Challenger Deep in the Mariana Trench. In order to get those samples or the sediment core in there, an underwater vehicle, which can dive to the deepest ocean and carry out the task, is needed, however, currently, there is no such vehicle in the world. So Japan Agency for Marine-Earth Science and Technology (JAMSTEC)...
For studies and investigates about the ocean, various underwater vehicles are used. All these vehicles controlled by electronics. Electronic devices need solid pressure vessel to protect them from seawater and water pressure. For electronic devices using under water, defer from using in the air, they need solid pressure vessel. Particularly, water pressure is increasing according to depth, so the...
JAMSTEC has developed the two types of underwater vehicle since 2005: an ROV to the oceans' deepest depth called ASSS11k (advanced sediment sampling system to 11,000 meter) and a hybrid underwater vehicle for use in shallow-water to mid-depth zones named PICASSO (Plankton Investigatory Collaborating Autonomous Survey System Operon). The most important purpose of the ASSS11k is to get a lot of mud...
Recently, a number of bacteria have been found from a mud sample of Challenger Deep in the Mariana Trench. Sampling those sediment samples, an ROV to the oceans' deepest depth is needed. But no vehicle gets to the deepest depth in the world. Scientists want to continuously explore the deepest parts of the oceans with a vehicle equipped with sediment samplers. JAMSTEC started developing a sediment...
JAMSTEC has been developing the remotely operated vehicle system having a limited role to explore the deepest parts of the oceans since April 2005. This ROV system's main mission is to survey sediments in sea bottoms. This system consists of a launcher and a small vehicle. The launcher carries two types of bottom samplers as well as the vehicle. One launches the small vehicle to make a preliminary...
A novel telemetry transmission system for next generation scientific underwater cable networks is proposed. The design concept features: (1) simple undersea Raman-effect transmitters employing only field-proven optical devices, (2) high capacity wavelength division multiplexing (WDM), (3) wavelength source distribution from the terrestrial terminal for flexibility and upgradeability and (4) per-node...
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