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Journal of the Acoustical Society of America / Volume 124 / Issue 3 / JASA EXPRESS LETTERS

Modal processing for acoustic communications in shallow water experiment

J. Acoust. Soc. Am. Volume 124, Issue 3, pp. EL177-EL181 (2008); (5 pages)

Andrey K. Morozov, James C. Preisig, and Joseph Papp

Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543amorozov@whoi.edu, jpreisig@whoi.edu, jpapp@whoi.edu

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Acoustical array data from the Shallow Water Acoustics experiment was processed to show the feasibility of broadband mode decomposition as a preprocessing method to reduce the effective channel delay spread and concentrate received signal energy in a small number of independent channels. The data were collected by a vertical array designed at the Woods Hole Oceanographic Institution. Phase-shift Keying (PSK) m-sequence modulated signals with different carrier frequencies were transmitted at a distance 19.2 km from the array. Even during a strong internal waves activity a low bit error rate was achieved.

© 2008 Acoustical Society of America

Acknowledgments

The authors express sincere thanks to Dr. James Lynch and Arthur Newhall for SW06 experimental data. The authors deeply thank Dr. Timothy Duda, Dr. Jon Collis, Dr. Ying Tsong Lin for the help in data processing, Keith Von Der Heydt for the SHARK acoustic array design, and Dr. Harry DeFerrari for the MSM underwater acoustic sound source. The research was supported by ONR.

Article Outline

  1. Introduction
  2. Experiment conditions
  3. Broadband mode filtering
  4. Correlation of mode filter output with the M -sequence signal
  5. Data processing results
  6. Conclusion

RELATED DATABASES

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KEYWORDS and PACS

Keywords

acoustic arrays, acoustic signal processing, array signal processing, modulation, underwater acoustic communication

PACS

  • 43.30.Bp

    Normal mode propagation of sound in water

ARTICLE DATA

History
Received 22 Jan 2008
Accepted 04 Apr 2008
Revised 26 Mar 2008
Published online 28 Aug 2008
Digital Object Identifier
http://dx.doi.org/10.1121/1.2960954

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

  1. Buck, J. R., Preisig, J. C., Wage, K. E., (1998). “A unified framework for mode filtering and the maximum a posteriori mode filter,” J. Acoust. Soc. Am. 103, 1813–1824JASMAN000103000004001813000001. [ISI]
  2. Collis, J. M., Duda, T. F., Lynch, J. F., and DeFerrari, H. A., (2008). “Observed limiting cases of horizontal field cohrerence and array performance in a time-varying internal wave- field,” J. Acoust. Soc. Am. 124, EL97–EL103JASMAN00012400000300EL97000001. [MEDLINE]
  3. Duda, T. F., and Collis, J. M., (2007) “Acoustic field coherence in four-dimensionally variable shallow water environments: Estimation using co-located horizontal and vertical line arrays,” Proceedings of the conference “Underwater Acoustic Measurements, Technologies and Results,” Crete, Greece.
  4. Headrick, R. H., Lynch, J. F., Kemp, J. N., Newhall, A. E., von der Heydt, K., Apel, J., Badey, M., Chiu, C.-S., Finette, S., Orr, M., Pasewark, B., Turdot, A., Wolf, S., and Tielbuerger, D., (2000). “Acoustic normal mode fluctuation statistics in 1995 SWARM internal wave scattering experiment,” J. Acoust. Soc. Am. 107, 201–220JASMAN000107000001000201000001. [ISI] [MEDLINE]
  5. Morozov, A. K., and Preisig, J. C., (2006). “Underwater acoustic communications with multi-carrier modulation.” Proceedings of Oceans 2006.
  6. Newhall, A. E., Duda, T. F., Von der Heydt, K., Irish, J. D., Kemp, J. N., Lerner, S. A., Liberatore, S. P., Lin, Y. T., Lynch, J. F., Maffei, A. R., Morozov, A. K., Shmelev, A. A., Sellers, C. J., and Witzell, W., (2007). “Acoustic and oceanographic observations and configuration information for the WHOI moorings from the SW06 experiment,” Applied Ocean Physics and Engineering (AOP&E), WHOI Technical Reports.
  7. Wage, K. E., Baggeroer, A. B., and Preisig, J. C., (2003). “Modal analysis of broadband acoustic receptions at 3515-km range in North Pacific using short-time Fourier techniques,” J. Acoust. Soc. Am. 113, 801–817JASMAN000113000002000801000001. [ISI] [MEDLINE]
  8. Wage, K. E., Dzieciuch, M. A., Worcester, P. F., Howe, B. M., and Mercer, J. A., (2005). “Mode coherence at megameter ranges in North Pacific Ocean,” J. Acoust. Soc. Am. 117, 1565–1581JASMAN000117000003001565000001.
  9. Yong-Min, Jiang, Chapman, N. Ross, and Badiey, Mohsen, (2007). “Quantifying the uncertainty of geoacoustic parameter estimates for the New Jersey shelf by inverting air gun data,” J. Acoust. Soc. Am. 121, 4, 1879–1894JASMAN000121000004001879000001. [ISI] [MEDLINE]

Figures (click on thumbnails to view enlargements)

FIG.1
Sound speed fluctuations.

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FIG.2
Mode-time correlations.

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FIG.3
(Color online) Signal complex envelop constellations at the output of mode filters.

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