Formation of high-frequency surface reverberation by excitation of directed acoustic pulses in oceanic waveguides

Abstract

UDC 542.26Using the ray approximation, we study the distribution of areas of effective surface reverberation formation as a function of observation conditions, in particular, the parameters of the plane-layered refractive waveguide, the wind waves, the probing pulses, and the transmit-receive antennas.

Tomographic observation of shallow-water inhomogeneities in the case of probing by a focused high-frequency acoustic field. I. Structure of simulation model

“…In calculations, the rays reflected by the body surface are sought by the iteration technique using the rays connecting the body center with the source and the receiver as the initial approximations [40][41][42][43][44].…”

“…On the basis of the ray representation, models can be constructed for the angular spectra of hydroacoustic noise of different types [31,43,44]. …”

“…We now determine expressions for the reverberation field reaching a separate hydrophone when the field is excited by a separate radiator [43,44]. 4.4.1.…”

Tomography in observation of inhomogenenities in shallow sea during sounding by a focused high-frequency acoustic field: II. Study of the observation efficiency

“…The analysis performed in [6][7][8] indicates that such a regularization can be implemented using a priori information in the form of a simulation model of the observation. The components of such a model include models of the waveguide, propagation and scattering of the high-frequency field, the observation system, the observed body, the concurrent randomly distributed inhomogeneities (scatterers of the sound), and independent (additive) noise [6][7][8][9][10][11][12][13][14][15][16][17]. Using such a system in the general case and calculating statistical distributions of the useful signals, and the noise and reverberation signals for particular observation conditions, it is possible to estimate the inverse-problem parameter regions in which the given accuracy of the observations can be ensured [6,7].…”

Experimental Estimation of the Data Transfer Rate of a Hydroacoustic Modem Model

“…Однако ре-альные условия разнообразны и такие явления, как рефракция, рассея-ние, реверберация и др. [15][16][17][18] приводят к тому, что акустический сигнал на приемной стороне является искаженным. Искажения прини-маемого сигнал значительно снижают скорость передачи данных по гидроакустическому каналу.…”