Electromagnetic Scattering from Ocean Surface Using Single Integral Equation and Adaptive Integral Method

摘要

An efficient algorithm for electromagnetic wave scattering from rough dielectric surfaces is being developed for the simulation of bistatic scattering and emission from ocean surface. The algorithm is based on a single magnetic field integral equation (SMFIE) and the surface is discretized using Rao-Wilton-Glisson (RWG) triangular basis function. The new feature of the algorithm is the application of the adaptive integral method (AIM) with SMFIE for speeding up the calculation. The new method will enable accurate simulations over large ocean surfaces, which have been until recently prohibited by the lack of computer povrer and method efficiency. Although the solver is applicable to a wide range of practical problems, the main goal of this work is to simulate the bistatic scattering and emission from a large area, with respect to wavelength, of ocean surface, size of which is made possible by the efficiency of the new method. The surface is illuminated with a Gaussian beam so that the edges of the surface do not contribute to the results significantly. In this paper we present a solution to the rough surface scattering using SMFIE with AIM, so that the computation can be speeded up with fast Fourier transform (FFT).