Higher Moment Estimation for Shallow-Water Reverberation Prediction

摘要: The modeling of the higher moments shallow-water reverberation is addressed for problems where non-Rayleigh caused by scattering from rough boundaries with chi-squared height distributions. Expressions first and third spatial height-distributed roughness are derived exponential correlation functions corresponding to von-Karman second-order spectra. trispectra these distributions also derived, differences highlighted between results that obtained limiting case Gaussian order A normal mode model propagation scatterers combined first-order perturbation theory compute pressure envelope in a 2-D waveguide as function time, length scale, non-Gaussianity parameterized degrees freedom (dof) distribution. Results show non-Rayleighness non-Gaussian controlled both degree ratio ensonified scatterer patch size scale. In waveguides, increases due multipath effects. It shown this effect causes trend towards Rayleighness envelope. when scale much greater than patch, effects time spread on statistics reduced, can persist.