title: Waveguide invariant analysis for modeling time-frequency striations in a range-dependent environment.
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.
authors.affiliation: Graduate Program in Acoustics, The Pennsylvania State University, University Park, Pennsylvania 16801, USA. aws164@psu.edu
authors.forename: Alexander W
authors.initials: AW
authors.lastname: Sell
authors.forename: R
authors.initials: R
authors.lastname: Lee Culver
mesh_terms: D000162:Acoustics; D003198:Computer Simulation; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D010363:Pattern Recognition, Automated; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014867:Water
chemical_list: D014867:Water