Signal & Interference Models

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Items marked by an asterix * are in development actually.

Several numerical models of undersea sound propagation have been developed:

Models for 1D environments (depth-depending)

Coherent field modeling

Fast normal modes programs

MODE1
Purpose: Coherent sound field modeling by using the normal modes method.

Fast ray programs

MODRAYS
Purpose: Coherent sound field modeling by using the method of Range(Angle) diagrams.

RAYS1
Purpose: Coherent sound field modeling by using the method of congruent rays beams.

1D ray traces in North-East Atlantic, Summer (18KB)

Interference modeling
Ambient noise modeling

MODNOISE
Purpose: Ambient noise modeling by using the mormal mode approximation.

RAYNOISE
Purpose: Ambient noise modeling by using the ray approximation.

NASINSO
Purpose: Ambient noise modeling by using the transport theory approach, with account of multiple scattering from boundaries and volume* roughness.

Reverberation modeling
Pulse reverberation

REGON
Purpose: Non-stationary scattered field modeling for the mono-static sonar by using the ray method.

BISTAT
Purpose: Non-stationary scattered field modeling for the bi-static sonar by using the ray method.

MODREV*
Purpose: Non-stationary scattered field modeling for the mono- and bi-static sonar by using the normal modes theory.

Stationary reverberation

SASINSO
Purpose: Stationary scattered field modeling for the bi-static sonar by using the transport theory approach, with taking into account the effect of multiple scattering from boundary and volume* roughness.

Modeling statistical characteristics of sound field fluctuations

SCATIND
Purpose: Scattered field modeling for wide-scale rough surfaces by using the Small-Slope or Dual-Scale approximations.

Examples of scattering index modeling for sea waving. (37KB GIF)

RASS
Purpose: Modeling statistical characteristics of fluctuations of ray parameters
due to internal waves of the Garett-Munk spectral model.

Example of ray travel time fluctuation modeling (7KB GIF)

Models for 2D environments (depth-depending and slightly range depending)

AMODE*
Purpose: Coherent sound field modeling by using the adiabatic normal modes approximation.

WAPER
Purpose: Coherent sound field modeling by using the finite-difference approximation of the wide-angle pseudo-differential parabolic equation.

2D sound propagation by parabolic equation in Mediterranean, Winter (13KB)

PUG
Purpose: Coherent sound field modeling by using the finite-difference approximation of the Helmholtz equation.

2D sound propagation in a shelf by Helmholtz equation (9KB)

Models for 3D environments

SHELF3
Purpose: 3D ray tracing program for calculation of direct & echo signals,
ambient noise and reverberation.

Modeling examples of using SHELF3 for the Elba's shelf area (276KB GIF)

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Author: Mikhail Galaktionov