Higher Order Method of Moments for Bistatic Scattering From 2d Pec Rough Surface With Geometric Modeling by Nurbs Surface

Abstract

Abstract-The higher order method of moments (HMOM) has been proposed to calculate the bistatic scattering from two-dimensional (2D) perfectly electric conducting (PEC) rough surface in this paper. The electric field integral equation (EFIE) is solved through the HMOM with the hierarchical higher order basis functions which are the modified Legendre polynomials. The non-uniform rational B-spline (NURBS) surface is applied to model the plane surface related to the rough surface. Validity of this approach is shown by comparing the bistatic scattering coefficient (BSC) to that of lower order MOM (LMOM) with the Rao-Wilton-Glisson (RWG) or rooftop basis function. This approach has fewer segments in the parametric directions than the LMOM with rooftop basis, and is more efficient for the fewer unknowns and requires less memory than the LMOM with RWG basis. Properties of bistatic scattering from a 2D Gaussian rough surface are also exhibited and analyzed.

Block Matrix Preconditioner Method for the Electric Field Integral Equation (Efie) Formulation Based on Loop-Star Basis Functions

“…The method of moments (MoM) techniques based on the electric field integral equation (EFIE) formulation have been widely used for analyzing time-harmonic electromagnetic radiation and scattering from conducting surfaces [1][2][3][4][5][6][7][8][9]. Because the MoM only requires surface discretization of conducting bodies and yields solutions that automatically satisfy the radiation condition, it has some advantages over other numerical methods such as the finite-difference time-domain (FDTD) [10][11][12][13][14][15] method and the finite element method (FEM) [16][17][18][19][20], particularly in open region problems such as radiation and scattering.…”

Estimation of the Atmospheric Duct From Radar Sea Clutter Using Artificial Bee Colony Optimization Algorithm

“…(6), and m the unknown environmental parameter vector. In general, the normalized sea surface radar cross section σ 0 is of difficulty to calculate with analytical or numerical methods at low grazing angle [26,27], thus it can be acquired by the sea clutter theoretical model of GIT [28].…”