Abstract
Acoustic scattering as the perturbation of an incident acoustic field from an arbitrary object is a critical part of the target-recognition process in synthetic aperture sonar (SAS) systems. The complexity of scattering models strongly depends on the size and structure of the scattered surface. In accurate scattering models including numerical models, the computational cost significantly increases with the object complexity. In this paper, an efficient model is proposed to calculate the acoustic scattering from underwater objects with less computational cost and time compared with numerical models, especially in 3D space. The proposed model, called texture element method (TEM), uses statistical and structural information of the target surface texture by employing non-uniform elements described with local binary pattern (LBP) descriptors by solving the Helmholtz integral equation. The proposed model is compared with two other well-known models, one numerical and other analytical, and the results show excellent agreement between them while the proposed model requires fewer elements. This demonstrates the ability of the proposed model to work with arbitrary targets in different SAS systems with better computational time and cost, enabling the proposed model to be applied in real environment.
Highlights
We propose a new model for computing acoustic waves scattering from underwater arbitrary objects; the model obtains scattered pressure using a new discretization method that employs non-uniform texture facets as primitive elements in the Helmholtz Kirchhoff (HK) integral equation
The basic ingredient of the proposed model is a new representation of acoustic scattering, and the model is described as an object surface non-uniform discretization method based on characterized information via local binary pattern (LBP) descriptors
We proposed a new scattering model that uses an efficient discretization method based on statistical target surface texture information to achieve an accurate acoustic scattering model with less computational cost and resources
Summary
These methods do not require large complex systems of equations and rather use approximate solutions to compute scattered pressures They are often appropriate for mid- and high-frequency range and for scatterers with special structures (Nolte et al 2015). We propose a new model for computing acoustic waves scattering from underwater arbitrary objects; the model obtains scattered pressure using a new discretization method that employs non-uniform texture facets as primitive elements in the Helmholtz Kirchhoff (HK) integral equation. & An efficient acoustic scattering model, called TEM, which is based on a new discretization method that uses object surface texture descriptions is proposed.
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