Abstract
To achieve high-speed underwater acoustic communication, a wideband transducer suitable for use in the vicinity of the sea bottom was developed. With the wideband characteristic maintained, the beam can be formed by combining two free-flooded rings. The characteristic of the developed transducer was measured. An excellent characteristic was obtained within an angular range from the horizontal to 30° elevation. Also, an excellent characteristic was obtained within the frequency range from 60 to 100 kHz. Moreover, a communication experiment was carried out using this transducer and quadrature phase shift keying (QPSK) modulation, and data were obtained near the sea bottom of 1,000 m depth. Transmitted data were demodulated by postprocessing, and it was able to be communicated at the transmission rate of 80 kbps over a transmission distance of 350 m.
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