Understanding and Utilizing Waveguide Invariant Range-frequency Striations in Ocean Acoustic Waveguides

摘要: Abstract : The range-frequency waveguide invariant describes striations that often appear in plots of acoustic intensity versus range and frequency. Signal processing techniques based on the are able to exploit effects ocean without requiring detailed knowledge sound speed profile or seafloor. This thesis develops a framework for understanding calculating invariant, uses create signal which may be applicable passive active sonar, time-reversal mirrors, array processing. A method passively estimating from an source receiver is developed, tested experimental data. Heuristics developed estimate minimum bandwidth horizontal aperture required estimation. semi-analytic formula derived using WKB approximation along with normal mode description field range-independent waveguide. illustrates how SSP seafloor properties affect value invariant. Array designed specifically purpose observing demonstrated. Finally, relationship between wavenumber integration derived.