Electromagnetic scattering analysis method of target with cavity on the basis of moment method and parabolic equation

A target electromagnetic scattering and analysis method technology, applied in the field of numerical calculation of target electromagnetic scattering characteristics, can solve problems such as large electrical size and electromagnetic characteristic analysis, and achieve the effects of simple equation formation, small memory consumption, and quick and easy matrix formation

Active Publication Date: 2015-07-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The electrical dimensions of such complex cavities are often very large, and it is difficult to analyze their electromagnetic characteristics by simple low-frequency or high-frequency methods

Method used

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  • Electromagnetic scattering analysis method of target with cavity on the basis of moment method and parabolic equation
  • Electromagnetic scattering analysis method of target with cavity on the basis of moment method and parabolic equation
  • Electromagnetic scattering analysis method of target with cavity on the basis of moment method and parabolic equation

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Embodiment 1

[0119] In this embodiment, a typical simulation of electromagnetic scattering from a metal-containing cavity target is performed. The simulation is implemented on a personal computer with a main frequency of 2.83GHz and a memory of 3.5GB. A metal cube with a side length of 6m and a cavity part with a side length of 4m is taken as an example. The plane wave is incident directly to the cavity opening. Observe the RCS at the center point of the cavity opening surface at different frequencies. The direction of the incident wave is θ=0°, The discrete interval in the x-axis direction is 0.1 wavelengths. In order to verify the correctness of the method of the present invention, the simulation result of the method of moments is used as a reference. Image 6 It is the comparison result of the RCS value at the backscattering point of the method of the present invention and the method of moments at each frequency, and the correctness of the method of this invention can be seen from the curv...

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Abstract

The invention discloses an electromagnetic scattering analysis method of a target with a cavity on the basis of a moment method and a parabolic equation. The method comprises the following steps: firstly, filling the cavity body of the target with the cavity with solid metal, establishing a discrete model, determining the axial direction of a parabola as an x axis, and dispersing a target along the axial direction of the parabola by a mesh; in an x-axis direction, utilizing a CN (Crank-Nicolson) difference scheme to obtain a relationship between two adjacent tangent planes; in y-axis and z-axis directions, independently adopting an RPIM (Radial Point Interpolation Method) constructing fractal function and a spatial derivative to construct a matrix equation; successively carrying out recursive solving on a node electric field value on each tangent plane; carrying out solving on a cavity body part in the target separately by a fast multipole algorithm, applying an electric field integral equation to obtain current on the surface of the cavity body, and obtaining the electric field value of each discrete point required by the parabolic equation on an opening surface of the cavity body; and finally, carrying out postprocessing on the electric field on a last tangent plane to obtain a radar scattering sectional area. A meshless parabola and a fast multipole acceleration moment method are combined, and the electromagnetic scattering analysis method has the advantages of being efficient and reliable.

Description

Technical field [0001] The invention belongs to the technical field of numerical calculation of electromagnetic scattering characteristics of a target, in particular to an electromagnetic scattering analysis method of a cavity-containing target based on a moment method and a parabolic equation. Background technique [0002] In the past ten years, the analysis of electromagnetic scattering characteristics of electrically large complex cavities has aroused widespread research interest. In the study of electromagnetic scattering characteristics of complex targets such as aircraft, for commonly used radar frequency bands, electrically large and complex cavities represented by air inlets and cockpits are one of the main scattering sources of the whole aircraft target. Therefore, the electromagnetic scattering of such cavities Characteristic analysis is an important foundation for aircraft stealth, anti-stealth and target characteristic analysis technology. In the field of electromagn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/16
Inventor 何姿陈如山樊振宏丁大志
Owner NANJING UNIV OF SCI & TECH
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