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    A tomographic ocean sound speed profile from a long veritcal acoustic array

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    Njeru_Thesis (7.040Mb)
    Date
    1992-02
    Author
    Njeru, James Murwanthanje  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5502
    Location
    Northeast Pacific Ocean
    DOI
    10.1575/1912/5502
    Keyword
     Tomography; Acoustic surface wave filters 
    Abstract
    An average sound speed profile over a 1000 km section of the northeast Pacific ocean is obtained using Ocean Acoustic Tomography, from data acquired during the 1987 SVLA experiment on a long (900 m) 120 hydrophone vertical acoustic array. In particular, we pulse compress the received signal with a phase-only matched filter. The signal, centered at 80Hz, is phase-modulated by a maximal length sequence. A fast m-sequence cross-correlation algorithm based on the Hadamard transform is used. In addition, wide band Doppler correction and coherent averaging of repetitions of the signal are performed. The tomographic inversion is initialized from a range averaged climatological profile. Multipaths are identified from ray theory. The identified arrivals are inverted for a range-independent sound speed profile change estimate. Estimates of source and array position error are also obtained. For the limited data set used, the sound speed change estimate is found to be insignificant, and a significant instrument position estimate is obtained.
    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 February 1992
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • WHOI Theses
    Suggested Citation
    Thesis: Njeru, James Murwanthanje, "A tomographic ocean sound speed profile from a long veritcal acoustic array", 1992-02, DOI:10.1575/1912/5502, https://hdl.handle.net/1912/5502
     

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