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No Access Submitted: 29 October 2015 Accepted: 10 August 2016 Published Online: 07 September 2016

  • Frequency based noise coherence-function extension and application to passive bottom-loss estimation

The Journal of the Acoustical Society of America 140, 1513 (2016); https://doi.org/10.1121/1.4962229
Lanfranco Muzia) and Martin Siderius
  • Department of Electrical and Computer Engineering, Portland State University, 1900 SW 4th Avenue, Portland, Oregon 97201, USA
    • Peter L. Nielsen
  • Centre for Maritime Research and Experimentation (CMRE), NATO Science and Technology Organization, Viale S. Bartolomeo 400, La Spezia, 19126, Italy
    • more...View Affiliations
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    • Lanfranco Muzi
    • Martin Siderius
    • Peter L. Nielsen
    ABSTRACT
    Accurate modeling of acoustic propagation in the ocean waveguide is important to SONAR-performance prediction. Particularly in shallow waters, a crucial contribution to the total transmission loss is the bottom refection loss, which can be estimated passively by beamforming the natural surface-noise acoustic field recorded by a vertical line array of hydrophones. However, the performance in this task of arrays below 2 m of length is problematic for frequencies below 10 kHz It is shown in this paper that, when the data are free of interference from sources other than wind and wave surface noise, data from a shorter array can be used to approximate the coherence function of a longer array. This improves the angular resolution of the estimated bottom loss, often making use of data at frequencies above the array design frequency. Application to simulated and experimental data shows that the technique, rigorously justified for a halfspace bottom, is effective also on more complex bottom types. Dispensing with active sources, small autonomous underwater vehicles equipped with short arrays can be envisioned as compact, efficient seabed-characterization systems. The proposed technique is shown to improve significantly the reflection-loss estimate of an array that would be a candidate for such application.

    ACKNOWLEDGMENTS

    The authors gratefully acknowledge the support of the Office of Naval Research Ocean Acoustics Program (ONR-OA Code 3211), and the Visiting Researcher Program of the NATO-STO Centre for Maritime Research and Experimentation (CMRE, formerly NATO Undersea Research Centre), which supported L.M. for part of this study. The authors also gratefully thank Reiner Onken, Scientist in Charge during the REP14-MED sea trial.

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