Computer Science – Sound
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspsa.372..117u&link_type=abstract
Royal Society (London), Proceedings, Series A - Mathematical and Physical Sciences, vol. 372, no. 1748, Aug. 4, 1980, p. 117-148
Computer Science
Sound
5
Acoustic Propagation, Internal Waves, Parabolic Differential Equations, Sea Water, Underwater Acoustics, Wave Propagation, Atmospheric Turbulence, Autocorrelation, Born Approximation, Electromagnetic Scattering, Far Fields, Fluctuation Theory, Frequency Response, Random Processes, Refractivity
Scientific paper
The paper discusses the parabolic equations for the propagation of the moments of an acoustic wave which are applied to random fluctuations of a sound wave in an ocean. A form of the Garrett-Munk spectrum with a continuous range of vertical wavenumbers describes the irregularities of refractive index due to internal waves; it also obtains the transverse autocorrelation function in the moment equations. The solution of the fourth-moment equation is extended to provide the temporal frequency spectrum of the intensity fluctuations which describes a feature common to optical and radiowave scatter, and also to the acoustic case.
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