The statistical characteristics of the response of an array of hydrophones to a moving narrow-band acoustic source in an ocean waveguide are investigated. The discrete Fourier transform of a solution of the wave equation with a moving source is calculated, and the sequence of the amplitudes of the Fourier coefficients at particular frequencies are shown to contain oscillatory terms that depend upon the environment, the source frequency, poition and velocity, and the resolution of the DFT. This analysis suggests that Gaussian mixture densities may apply to time series of Fourier coefficients of data received from a moving source. This is verified by analyzing data from a deep water Navy experiment. Simulations are then carried out which show that the fluctuations caused by source motion are sufficient to favor Gaussian mixture densities over Gaussian densities and that the applicability of the Gaussian model, but not the Gaussian mixture model, depends upon the velocity and position of the source.
Statistical characteristics of moving acoustic sources in ocean waveguides
Statistisches Verhalten von sich bewegenden akustischen Quellen in Ozeanwellen
Journal of the Acoustical Society of America ; 98 , 3 ; 1486-1495
1995
10 Seiten, 12 Bilder, 2 Tabellen, 27 Quellen
Aufsatz (Zeitschrift)
Englisch
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