Abstract:
A general analytical expression for the time-dependent field intensity scattered from or through (penetrating) a 2-D fluid-fluid rough surface due to a narrow-band incident plane wave and a narrow-band point source are derived and expressed in terms of the bistatic scattering cross section per unit area of the rough surface. Even though the scattering cross section is defined as a far-field quantity, this near-field result is general and exact for the special case of a continuous wave source and incident plane wave. Dispersion of a pulse is a function of medium parameters, the incident and scattered directions, as well the bandwidth and center frequency of the source signal. First-order perturbation calculations for the case of a Gaussian pulse illustrate intensity pulse dispersion effects due to forward scattering into a lossy sediment. [Work supported by ONR.]