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    Performance bounds on matched-field methods for source localization and estimation of ocean environmental parameters

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    Xu_thesis.pdf (9.463Mb)
    Date
    2001-06
    Author
    Xu, Wen  Concept link
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    Citable URI
    https://hdl.handle.net/1912/3477
    DOI
    10.1575/1912/3477
    Keyword
     Parameter estimation; Underwater acoustics 
    Abstract
    Matched-field methods concern estimation of source location and/or ocean environmental parameters by exploiting full wave modeling of acoustic waveguide propagation. Typical estimation performance demonstrates two fundamental limitations. First, sidelobe ambiguities dominate the estimation at low signal-to-noise ratio (SNR), leading to a threshold performance behavior. Second, most matched-field algorithms show a strong sensitivity to environmental/system mismatch, introducing some biased estimates at high SNR. In this thesis, a quantitative approach for ambiguity analysis is developed so that different mainlobe and sidelobe error contributions can be compared at different SNR levels. Two large-error performance bounds, the Weiss-Weinstein bound (WWB) and Ziv-Zakai bound (ZZB), are derived for the attainable accuracy of matched-field methods. To include mismatch effects, a modified version of the ZZB is proposed. Performance analyses are implemented for source localization under a typical shallow water environment chosen from the Shallow Water Evaluation Cell Experiments (SWellEX). The performance predictions describe the simulations of the maximum likelihood estimator (MLE) well, including the mean square error in all SNR regions as well as the bias at high SNR. The threshold SNR and bias predictions are also verified by the SWellEX experimental data processing. These developments provide tools to better understand some fundamental behaviors in matched-field performance and provide benchmarks to which various ad hoc algorithms can be compared.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2001
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    • WHOI Theses
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Thesis: Xu, Wen, "Performance bounds on matched-field methods for source localization and estimation of ocean environmental parameters", 2001-06, DOI:10.1575/1912/3477, https://hdl.handle.net/1912/3477
     

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