Medium rough surface electromagnetic scattering simulation method based on multi-zone model moment method

Abstract

The invention discloses a medium rough surface electromagnetic scattering simulation method based on a multi-zone model moment method. The method includes the steps of inputting a medium rough surface power spectral density function and rough surface parameters, obtaining position coordinates of N scattering surface elements on a rough surface through a Monte Carlo method, dividing the rough surface into a main zone and a non-main zone, obtaining equivalent current on the surface elements of the two zones respectively, obtaining an electromagnetic scattering coefficient of the rough surface, and achieving medium rough surface electromagnetic scattering simulation. According to the method, zone division is performed on the rough surface, a boundary integral equation is built through the moment method in the main zone which has large influences on scattering results, the equivalent current of the main zone is obtained, the equivalent current is obtained approximately in the non-main zone, the number of unknown quantities is lowered under the premise that certain accuracy is guaranteed, internal storage is reduced, calculation efficiency is improved, the technical problem of actual large-zone medium rough surface electromagnetic scattering simulation is solved, and the method is applied to rough surface radar scattering property study in the fields of national defense and civil use.

Description

technical field [0001] The invention belongs to the technical field of radar electromagnetic simulation, and mainly relates to numerical simulation of electromagnetic scattering, in particular to an electromagnetic scattering simulation method of a medium rough surface based on a multi-region model moment method, which is used for obtaining the electromagnetic scattering coefficient of the medium rough surface. 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 sca...

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Problems solved by technology

It can be seen that once the surface area of ​​the calculation object increases, the number of divisions N of the rough surface will increase accordingly, and a large number of unknown quantities will be generated in the calculation of the method of moments, and the scale of the impedance matrix will be N 2 The order of magnitude increases, and the memory consumption will also increase with N 2 The order of magnitude growth, while solving the matrix equation will consume a lot of computer time

As for the actual rough surface, the area is usually large. When the simple method of moments is used to simulate its scattering characteristics, due to its large memory consumption and slow analysis speed, the configuration of ordinary personal computers cannot meet the simulation requirements. Therefore, this method It is difficult to apply to the simulation of electromagnetic scattering on the actual large-area rough surface

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