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Research and development on underwater acoustic communications are in progress in our group. In January, 2010, we carried out the sea area experiment at near bottom in about 1,600m depth area using quadrature phase shift keying (QPSK) and 8-phase shift keying (8PSK) modulation method. A wideband tilted toroidal beam transducer and a multi-channel combined decision feedback equalizer with 4-hydrophone...
In recent years, precise underwater observations have been performed by autonomous underwater vehicles (AUVs). The super short baseline (SSBL) method is often used to position the vehicle because of its simplicity and efficiency of the operation. Then more accurate positioning by SSBL is requested. The advantages of the SSBL method are the simplicity of the operation and the time efficiency. However,...
In JAMSTEC, the acoustic communication is investigated, especially in deep water environment. Then, short-range (up to 500 m) high speed (around 64 kbps) acoustic communication system for deep sea environment is investigated in our group. To obtaining an real sea data of acoustic transmission, an experiment was carried out at the depth of 1,000 m in February 2007. A transmitter was moored at near...
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