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    Robust acoustic signal detection and synchronization in a time varying ocean environment

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    Gieleghem_Thesis (2.778Mb)
    Date
    2012-09
    Author
    Gieleghem, Ryan T.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5357
    DOI
    10.1575/1912/5357
    Keyword
     Signal detection; Underwater acoustics 
    Abstract
    Signal detection and synchronization in the time varying ocean environment is a difficult endeavor. The current common methods include using a linear frequency modulated chirped pulse or maximal length sequence as a detection pulse, then match filtering to that signal. In higher signal to noise ratio (SNR) environments (~0 dB and higher) this has been a suitable solution. As the SNR drops lower however, this solution no longer provides an acceptable probability of detection for a given tolerable probability of false alarm. The issue derives from the inherent coherence issues in the ocean environment which limit the useful matched filter length. This thesis proposes an alternative method of detection based on a recursive least squares linearly adaptive equalizer which we term the Adaptive Linear Equalizer Detector (ALED). This detectors performance has demonstrated reliable probability of detection with minimal interfering false alarms with SNR as low as -20 dB. Additionally this thesis puts forth a computationally feasible method for implementing the detector.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2012
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • WHOI Theses
    Suggested Citation
    Thesis: Gieleghem, Ryan T., "Robust acoustic signal detection and synchronization in a time varying ocean environment", 2012-09, DOI:10.1575/1912/5357, https://hdl.handle.net/1912/5357
     

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