Waveguide invariant analysis for modeling time-frequency striations in a range-dependent environment |
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Authors: | Sell Alexander W Lee Culver R |
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Affiliation: | Graduate Program in Acoustics, The Pennsylvania State University, University Park, Pennsylvania 16801, USA. aws164@psu.edu |
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Abstract: | The waveguide invariant is a useful parameter for understanding the behavior of interference patterns (e.g., striations in time-frequency plots) resulting from broadband acoustic sources in shallow water waveguides. It is possible to model these striations for range-dependent environments using conventional parabolic equation methods; although this approach can be computationally intensive as a full field must be created for each frequency and azimuthally dependent geometry. This letter discusses the formulation and use of a range-dependent waveguide invariant distribution that can be used to describe spectral striation patterns using a fraction of the computing power required by parabolic equation methods. |
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