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Transient localization in shallow water environments with a vertical line array

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Author
Tas, Gerard
Date
2000-06
Advisor
Smith, Kevin B.
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Abstract
Several algorithms based on autocorrelation matching of multiple hydrophone elements in a vertical line array have been developed to localize a broadband transient signal. An earlier developed frequency-domain autocorrelation matching (FACM) algorithm was based on autocorrelation matching of only a single hydrophone. The success and robustness of this algorithm in the presence of environmental mismatch was the motivation to adapt it to include the additional information of multiple hydrophones. The new algorithms developed were based on joint autocorrelation matching, specifically depth- and frequency- domain autocorrelation matching ((KzFACM)), wavenumber- and frequency-domain autocorrelation matching (kzFACM), and an incoherent summation of the FACM results of all the elements in a vertical line array (lFACM). These algorithms were tested in simple, shallow water environments with and without mismatch in the specification of acoustic parameters (e.g., bathymetry and sound speed). The results suggest that the use of the additional information from multiple elements does improve both the accuracy and robustness of the localizations. All of the algorithms produced similar results, although the lFACM and the KzFACM algorithms appeared to perform slightly better than the (KZFACM) algorithm in the presence of mismatch. However, the relative performance of the algorithms appeared to be sensitive to the environment and placement of the source and receivers in the waveguide.
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http://handle.dtic.mil/100.2/ADA381469
http://hdl.handle.net/10945/9332
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  • 1. Thesis and Dissertation Collection, all items

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    Shallow water acoustic variability and influences on autocorrelation matching localization algorithms 

    Correa, Arthur F. Bettega (Monterey, California. Naval Postgraduate School, 1998-12);
    In this work, several algorithms based on higher-order moment (autocorrelation) matching of single hydrophone element data have been developed and tested on real transient data sets. Of particular interest is the success ...
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    Transient localization in shallow water environments 

    Brune, Joachim (Monterey, California. Naval Postgraduate School, 1998-03);
    In this work, the robustness of a simple, Bartlett-type processor based on matching broadband signal autocorrelation functions is investigated. Measures of robustness to be examined include the size of the localization ...
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    Variations on autocorrelation matching and the sift localization algorithm 

    De Kooter, Peter M. (Monterey, California. Naval Postgraduate School, 1997-03);
    As part of the existing acoustic transient localization program, a feasibility study was performed to apply existing algorithms to signals at higher carrier frequencies. The coherent matching, autocorrelation matching and ...
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