Use of the Wavenumber Technique with the Lloyds Mirror for an Acoustic Doublet.
useofwavenumbert00king.pdf (6.436Mb)Abstract
This thesis examines a method to determine the depth of
a point source in an isospeed ocean environment. Using the
Fourier Transform on the acoustic pressure field in the
range domain results in the attainment of the acoustic pressure
spectrum in the wavenumber domain and a characteristic
nodal spacing unique to the source-receiver depths.
Quantitative examination of a magnitude plot of the spectrum
and use of simple mathematical formulae yield the source
depth. The debilitative effects of narrowband noise and
surface roughness on the pressure spectrum are also examined.
The pressure spectrum is recognizable in noise after
the pressure field in the range domain has been lost in the
noise field. The effect of surface gravity waves on the
pressure spectrum is similar to that on the pressure field
in the range domain: the characteristic nodal spacing is
suppressed as the height of the surface waves increases.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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