Recursive ray acoustics for three-dimensional sound-speed profiles
Polnicky, F. Wynn
Ziomek, Lawrence J.
MetadataShow full item record
A comparison of a simple recursive ray acoustics algorithm versus a ray acoustics algorithms based on solving a system of first-order ordinary differential equations was conducted. the recursive ray acoustics (RRA) was found to be accurate and relatively fast. The RRA algorithm is capable of handling sound speed as a function of all three spatial coordinates, and this capability was demonstrated. Two separate methods of representing a sound-speed profile (SSP) based on data points were examined: Akima cubic spline and spatial Fourier series (SFS). The SFS representation encountered difficulties in accurately modeling SSPs. Various techniques were applied to improve the SFS sound-speed representation. While accurate sound-speed fits eventually achieved, difficulties remained in the SFS modeling of first and second-order derivatives of the sound-speed data. The RRA algorithm was tested using the SFS sound-speed representation and found to be significantly inaccurate. A demonstration was conducted of the ability of the SFS sound-speed representation to incorporate randomness in the SSP.
RightsCopyright is reserved by the copyright owner
Showing items related by title, author, creator and subject.
Observations of thermohaline sound-speed structure induced by internal waves and spice in the summer 2015 Canada Basin marginal ice zone DiMaggio, Dominic; Colosi, John A.; Joseph, John; Pearson, Annalise; Worcester, Peter F.; Dzieciuch, Matthew A. (2018);The Arctic seas are in a period of transition as they adjust to stimuli from anthropogenic climate change. The acoustic response to this adjustment is of fundamental interest, as acoustics provide an important means for ...
Colosi, John A.; Van Uffelen, Lora J.; Cornuelle, Bruce D.; Dzieciuch, Matthew A.; Worcester, Peter F.; Dushaw, Brian D.; Ramp, Steven R. (2013-10);As an aid to understanding long-range acoustic propagation in the Philippine Sea, statistical and phenomenological descriptions of sound-speed variations were developed. Two moorings of oceanographic sensors located in ...
South China Sea internal tide/internal waves-impact on the temporal variability of horizontal array gain at 276 Hz Orr, Marshall H.; Pasewark, Bruce H.; Wolf, Stephen N.; Lynch, James F.; Schroeder, Theodore; Chiu, Ching-Sang (IEEE, 2004-10);The temporal variability of the spatial coherence of an acoustic signal received on a bottomed horizontal array has been calculated for 276-Hz narrow-band signals. A conventional plane wave beamformer was applied to the ...