QIAO Gang  SANG Enfang

(Harbin Engineering University, Key Lab of UWA Technology Harbin 150001)

Received May 23, 2006

 Revised Jul. 31, 2006

Abstract  Underwater acoustics (UWA) communication based on an acoustic vector sensor is studied. The method of joint weighted sound pressure and velocity processing is used in phase modulation high-speed UWA communication system combined with coherent demodulation and adaptive equalization algorithm to demodulate and decode. Whereas the sound intensity could be used instead of pressure for frequency decoding in frequency modulation UWA communication system. The results of theory analysis, simulation calculations and lake trials have shown that either in phase modulation or in frequency modulation UWA communication system, the processing gain can be evidently increased, so that the BER (bit error rate) can be effectively reduced and the telemetry distance can be enlarged by using the acoustic vector sensor.

PACS number: 43.30, 43.60