Medium rough surface finite element electromagnetic simulation method based on integral boundary

Abstract

The invention discloses a medium rough surface finite element electromagnetic simulation method based on integral boundary. The medium rough surface finite element electromagnetic simulation method based on the integral boundary mainly solves the problem that similarity of inhomogeneous media and approximate absorbing boundary are difficult to solve by integral equation class methods. The medium rough surface finite element electromagnetic simulation method based on the integral boundary comprises the achieving steps of using a monte carlo method for obtaining a medium rough surface, carrying out truncation processing and scattering on the medium rough surface through an artificial boundary, acquiring a finite element equation of a simulation area according to a functional method inside the simulation area, using an integral equation method for obtaining integral boundary conditions outside the simulation area, forming an electromagnetic coupled equation through continuous conditions, and finally obtaining radar scattering parameters of the medium rough surface by solving an electromagnetic coupled matrix equation. Compared with the prior art, the medium rough surface finite element electromagnetic simulation method based on the integral boundary can be more easily used for simulating inhomogeneous medium electromagnetic problems than the integral equation class methods, can improve electromagnetic simulation precision compared with the approximate absorbing boundary, and can be used for acquiring the electromagnetic scattering parameters of medium rough surface unbounded area problems.

Description

technical field [0001] The invention belongs to the field of radar electromagnetic simulation, in particular to electromagnetic scattering numerical simulation, which is used for obtaining electromagnetic scattering parameters of unbounded areas such as medium rough surfaces. Background technique [0002] With the rapid development of radar technology, the study of electromagnetic scattering on rough surfaces is of great significance in theoretical analysis and practical application. When the airborne or spaceborne radar conducts electromagnetic detection on the target in the rough surface background, the echo signal of the radar contains the electromagnetic scattering signal of the rough surface background. By analyzing these echo signals, the rough surface and Detect certain properties of the target. Therefore, the research on radar scattering characteristics of rough surfaces has significant academic value and broad application prospects in the field of national defense ...

AI Technical Summary

Problems solved by technology

In previous ground-sea-surface problems, perfectly matched layers and absorbing boundary conditions were often used as artificial boundaries. However, the analysis accuracy of these approximate boundary conditions is low, and they often need to be set at a far distance from the model, which greatly increases the The unknowns required for the simulation problem

As the most accurate boundary condition, the integral boundary condition is only used in the electromagnetic simulation of a finite size target, and the finite element method based on the integral boundary has not been applied to the simulation of radar scattering parameters on a medium rough surface.

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