Rotationally symmetric target electromagnetic scattering rapid calculation method of thin-medium-coated metal

Abstract

The invention discloses a rotationally symmetric target electromagnetic scattering rapid calculation method of thin-medium-coated metal. For a metal-medium mixing structure, an electric field integral equation only needs to be built for a metal part rather than a medium part, so that an equation building process is simple, and the equation belongs to second integral equations; and therefore, the method is good in iterative solution behavior. When the iterative solution is adopted, the required calculation accuracy can be quickly converged. According to the rotationally symmetric characteristic of the target, a three-dimensional problem is reduced into a two-dimensional problem to be analyzed, so that the solution speed can be increased, and the solution internal memory can be reduced. The metal surface charge density, the medium body polarization current density and the polarization current density on and under the surface of a medium layer are expressed by the metal surface current density, so that the mesh generation is only carried out on the metal part rather than the medium part; and therefore, the generation regions can be reduced, and the method is convenient to operate.

Description

technical field [0001] The invention belongs to the numerical calculation technology of target electromagnetic scattering characteristics, in particular to a fast calculation method for electromagnetic scattering of a metal rotationally symmetric target coated with a thin medium. Background technique [0002] With thin dielectric coated metal targets appearing more and more in practical applications, it is extremely important to propose an accurate and effective electromagnetic analysis model. In the design of military targets such as aircraft and ships, thin dielectric coatings are usually used as absorbing materials to reduce their radar cross-section (RCS) values ​​(Bhattacharyya A K. Electromagnetic scattering from a flat plate with rim loading and ram saving IEEE Transaction on Antennas and Propagation,1989,37(5):659–663.), they are also composed of metal and thin dielectric layers. These extensive applications have forced scholars to propose a series of electromagneti...

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Problems solved by technology

At the same time, because different parts are analyzed by different equations, the performance of the entire matrix equation is poor

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