Fast Simulation Method of Electromagnetic Scattering Characteristics of Sea Skimming Vehicle

Abstract

The invention discloses a high-speed simulation method for electromagnetic scattering characteristics of a sea skimmer. The method comprises the steps of establishing a discrete model of an object; determining the axial direction of a parabola as the x axis; performing discretization on the object in the axial direction of the parabola with a grid, such that a plurality of tangent planes perpendicular to the x axis are formed; determining a boundary point of the object contacting with each tangent plane and judging positions of all nodes; acquiring the relation between every two adjacent tangent planes in the x axis with a CN (Crank-Nicholson) difference scheme; constructing a shape function and a space derivative in the y axis and the z axis by an RPIM (Radial Point Interpolation Method); constructing a matrix equation on the surface of a scatterer according to simultaneous equations including a relation equation and a divergence equation of an incident wave and a reflected wave passing through a sea level; sequentially performing recursion on electric field values of the nodes on the tangent planes; solving a matrix equation of the last tangent plane and a previous tangent plane; determining a magnetic field according to the difference of the electric field values of the two tangent planes in the x axis direction; and determining the radar scattering section area according to a reciprocal theory. The method can rapidly analyze the electromagnetic scattering characteristics in a half-space environment.

Description

technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic scattering characteristics, in particular to a fast simulation method for electromagnetic scattering characteristics of a sea-skimming aircraft. Background technique [0002] Various calculation methods, including high-frequency approximation methods to low-frequency numerical methods, as well as methods for calculating the scattering properties of various media, are being extensively studied. In recent decades, with the development and application of computational electromagnetics, a variety of methods for analyzing scattering problems have emerged. The analysis methods for electromagnetic scattering are mainly carried out in two ways, namely, high-frequency approximation method and low-frequency numerical method. , both have their characteristics and limitations. The low-frequency methods for calculating RCS are all numerical methods, which are divided in...

AI Technical Summary

Problems solved by technology

[0003] Numerical methods of electromagnetic calculation, such as finite element method (FEM), finite difference time domain method (FDTD) and other differential methods to solve the scattering problem of electrically large-sized targets in half-space, have defects such as large unknowns due to the dispersion of the propagation space.

On the other hand, in the integral equation, the half-space Green's function is combined with the method of moments, and fast multipoles are introduced to calculate larger-sized targets. Scattering Problems of Targets with Complicated Dimensions

Images