The Journal of the Acoustical Society of Korea

The Acoustical Society of Korea (한국음향학회)
권호 표지

Broadening of Foci in an Ocean Time Reversal Processing and Application to Underwater Acoustic Communicaion

  • Published : 2008.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, a method for robust time reversal focusing has been introduced to extend the period of stable focusing in time-dependent ocean environments [S. Kim et al., J. Acoust. Soc. Am. 114, 145-157, (2003)]. In this study, concept of focal-size broadening based on waveguide invariant theory in an ocean time reversal acoustics is described. It is achieved by imposing the multiple location constraints. The signal vector used in multiple location constraints are found from the theory on waveguide invariant for frequency band corresponding the extended focal range. The broadening of foci in an ocean waveguide can play an important role in the application of time reversal processing, particularly to the underwater acoustic communication with moving vehicles. The proposed method is demonstrated in the context of the underwater acoustic communication from the transmit/receive array (TRA) to a slowly moving vehicle.

Keywords

References

  1. S. Kim, W. A. Kuperman, W. S. Hodgkiss, H. C. Song, G. F. Edelmann and T. Akal, Robust time reversal " focusing in the ocean," J. Acoust. Soc. Am. 114, 145-157, 2003 https://doi.org/10.1121/1.1582450
  2. M. Fink,"Time-reversal mirrors,"in Acoustical Imaging, B. F. Jones Ed. New York: Plenum, 25, 1-15, 1995
  3. M. Fink,"Time-reversal acoustics,"Phys Today, 50, 34-40, 1997
  4. W. A. Kuperman, W. S. Hodgkiss, H. C. Song, T. Akal, C. Ferla and D. R. Jackson, "Phase conjugation in the ocean: Experimental demonstration of an acoustic time-reversal mirror," J. Acoust. Soc. Am. 103, 25-40, 1998 https://doi.org/10.1121/1.423233
  5. H. C. Song, W. A. Kuperman and W. S. Hodgkiss, "A timereversal mirror with variable range focusing," J. Acoust. Soc. Am. 103, 3234-3240, 1998 https://doi.org/10.1121/1.423040
  6. D. R. Jackson and D. R. Dowling, "Phase conjugation in underwater acoustics," J. Acoust. Soc. Am. 89, 171-181, 1991 https://doi.org/10.1121/1.400496
  7. G. F. Edelmann, T. Akal, W. S. Hodgkiss, S. Kim, W. A. Kuperman and H. C. Song, "An initial demonstration of underwater acoustic communication using time reversal," IEEE J. Oceanic Eng. 27, 602-609, 2002 https://doi.org/10.1109/JOE.2002.1040942
  8. J. S. Kim, H. C. Song and W. A. Kuperman, "Adaptive timereversal mirror," J. Acoust. Soc. Am. 109, 1817-1825, 2001 https://doi.org/10.1121/1.1358299
  9. J. S. Kim and K. C. Shin, "Multiple focusing with adaptive time -reversal mirror," J. Acoust. Soc. Am. 115, 600-606, 2004 https://doi.org/10.1121/1.1640389
  10. A. B. Baggeroer, W. A. Kuperman and H. Schmidt, "Matched field processing: Source localization in correlated noise as an optimum parameter estimation problem," J. Acoust. Soc. Am. 83, 571-587, 1988 https://doi.org/10.1121/1.396151
  11. P. Roux and M. Fink, "Time reversal in a waveguide: Study of the temporal and spatial focusing," J. Acoust. Soc. Am. 107, 2418- 2429, 2000 https://doi.org/10.1121/1.428628
  12. A. B. Baggeroer, W. A. Kuperman and P. N. Mikhalevsky, "An overview of matched field methods in ocean acoustics," IEEE J. Oceanic Eng. 18, 401-424, 1993 https://doi.org/10.1109/48.262292
  13. S. D. Chuprov, "Interference structure of a sound field in a layered ocean," Acoustics of the Ocean: Current Status (in Russian), edited by L. M. Brekhovskikh and I. B. Andreevoi, (Nauka, Moscow, 71-91, 1982)
  14. G. A. Grachev, "Theory of acoustic field invariants in layered waveguide," Acoust. Phys. 39, 33-35, 1993
  15. G. L. D'Spain and W. A. Kuperman,"Application of waveguide invariants to analysis of spectrograms from shallow water environments that vary in range and azimuth," J. Acoust. Soc. Am.106, 2454-2468, 1999 https://doi.org/10.1121/1.428124
  16. M. B. Porter,"The KRAKEN Normal Mode Program,"SACLANT Undersea Research Center SM-245, La Spezia, Italy, 1991