A MONTE-CARLO FDTD TECHNIQUE FOR ROUGH-SURFACE SCATTERING

A Monte-Carlo finite-difference time domain (FDTD) technique is developed for wave scattering from randomly rough, one-dimensional surfaces satisfying the Dirichlet boundary condition, Both single-scale Gaussian and multiscale Pierson-Moskowitz surface roughness spectra are considered, Bistatic radar cross sections are calculated as a function of scattering angle for incident angles of 0, 45, 70, and 80 degrees measured from the vertical. The contour path FDTD method is shown to improve accuracy for incident angles greater than 45 degrees, Results compare well with those obtained using a Monte-Carlo integral equation technique.