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Related Concept Videos

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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A Stable Phantom Material for Optical and Acoustic Imaging
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Long-range acoustic communication in deep water using a towed array.

H C Song1, S Cho, T Kang

  • 1Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0238, USA. hcsong@mpl.ucsd.edu

The Journal of the Acoustical Society of America
|March 25, 2011
PubMed
Summary
This summary is machine-generated.

Acoustic communication experiments achieved 50 bits/s over 550 km using advanced modulation and beamforming. This demonstrates efficient underwater data transfer for long-range applications.

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Area of Science:

  • Oceanography
  • Underwater acoustics
  • Signal processing

Background:

  • Long-range acoustic communication (LRAC) is crucial for underwater exploration and data transmission.
  • Previous studies have explored various methods for improving data rates and reliability in underwater acoustic channels.

Purpose of the Study:

  • To assess the feasibility of achieving high data rates in deep-water acoustic communication.
  • To evaluate the performance of quadrature-phase shift-keying (QPSK) modulation and beamforming techniques in a long-range setting.

Main Methods:

  • Conducted a long-range acoustic communication (LRAC10) experiment in deep water off the Southern California Coast in September 2010.
  • Utilized a towed acoustic source and a towed horizontal line array operating at depths of approximately 75 m and 200 m, respectively.
  • Transmitted phase-coherent communication sequences in the 200-300 Hz frequency band over ranges of 100-700 km.

Main Results:

  • An information rate of 50 bits/s was successfully achieved over a range of approximately 550 km.
  • The experiment demonstrated the effectiveness of combining quadrature-phase shift-keying (QPSK) modulation with error-correction coding and beamforming.

Conclusions:

  • The LRAC10 experiment validates the potential for robust and efficient long-range underwater acoustic communication.
  • The achieved data rates suggest that QPSK modulation and beamforming are promising techniques for future underwater communication systems.