Abstract
Acoustical remote sensing of interface roughness usually involves an interpretation of the scattered signal assuming the forward problem is understood. The accuracy of the standard scattering approximations for power law roughness spectral densities typical of the seafloor will be reviewed. The approximations include the Kirchhoff approximation and the lowest-order perturbation approximation. The effects of roughness at wave numbers higher than the Bragg wave number will also be considered. Exact integral equation results for 1-D surfaces are used for ground truth. [Work supported by ONR.]
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