Preliminary Investigation of the Environmental Sensitivity of Acoustic Signal Transmission in the Wavenumber Domain with Respect to Source Depth Determination.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The Wavenumber Technique WT is a relatively new method of underwater sound transmission analysis. One aspect, source depth determination, is studied to evaluate its validity and test environmental and acoustic sensitivity. The horizontal wavenumber spectrum is analyzed to determine null spacings in wavenumber space, which indicates source depth by the Lloyds Mirror interference effect. Comparison of this theory with cases of an isospeed sound profile, fully absorbing bottom, and flat totally-reflecting surface shows excellent agreement for several parametric variations. Cases with realistic sound speed profiles and partially absorbing bottoms generally agree with theory, but a distinct bias is observed. Source depth determination curves, which relate scaled wavenumber spectral intensity null spacing to the source depth, are presented for comparison with theory and sensitivity analysis. An example is given for suggested application of source depth determination. Author
- Acoustic Detection and Detectors