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Quick calculation method for terahertz band surface rough target electromagnetic scattering

A target electromagnetic scattering, surface roughening technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve the problem that the target surface cannot be regarded as an ideal smooth surface, achieve good adaptability, high computational efficiency, Quickly Calculated Effects

Active Publication Date: 2015-10-21
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Existing research generally uses high-frequency methods based on geometrical optics (Geometrical Optics, GO), physical optics (Physic Optics, PO) and ray tracing for terahertz scattering calculations. However, the efficiency of these methods is based on the assumption that the target surface is smooth However, in reality, especially when the wavelength is close to the roughness of the target surface, the target surface cannot be regarded as an ideal smooth surface
How to consider the effect of surface roughness on target scattering in the calculation of target scattering in the terahertz frequency band is still a problem to be studied, and there is currently no effective means for this problem

Method used

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  • Quick calculation method for terahertz band surface rough target electromagnetic scattering
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  • Quick calculation method for terahertz band surface rough target electromagnetic scattering

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Embodiment Construction

[0056] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be noted that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0057] Figure 4 It is a flow chart of the present invention. The present invention provides a fast calculation method for electromagnetic scattering of a target with a rough surface in the terahertz frequency band, which includes the following steps:

[0058] The first step is to initialize the settings, specifically including dielectric parameter setting, incident and scattering angle sampling point setting, and simulation frequency sampling point setting.

[0059] The second step is the semi-deterministic target modeling based on two-level mesh division.

[0060] ①The first level of patch mode...

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Abstract

The invention proposes a quick calculation method for terahertz band surface rough target electromagnetic scattering. The method is a patch grading semi-deterministic target modeling method, and in the method a full-wave theory proposed by E.Bahar for the rough surface scattering problem is used to implement electromagnetic scattering calculation of surface rough target. The patch grading based semi-deterministic target modeling method can satisfy a requirement that a shape of a target are depicted and rough features of the target surface are reflected, and meanwhile, can reduce storage space occupied by a target model. The full-wave theory based rough surface quick calculation method has good adaptability to roughness parameters in a relatively wide range, and is high in calculation efficiency, thereby implementing quick calculation of a rough target scattering.

Description

Technical field [0001] The invention mainly relates to the technical field of electromagnetic scattering simulation of radar targets, in particular to a modeling and fast calculation method for electromagnetic scattering of super-electric large-scale targets with rough surfaces in the terahertz frequency band. Background technique [0002] The scattering characteristics of terahertz targets are the fundamental problem faced by active detection using terahertz. Some scholars have made fruitful explorations on the calculation methods of target scattering characteristics in the terahertz frequency band. However, existing researches usually follow the assumption that the target surface is smooth in the microwave frequency band. Since the terahertz wavelength is much smaller than that of microwaves, this assumption is true. It is difficult to establish in China. Experimental studies have shown that in the terahertz frequency range, rough surfaces will have a significant impact on the...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王宏强秦玉亮邓彬高敬坤王瑞君黎湘
Owner NAT UNIV OF DEFENSE TECH
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