A Fast Calculation Method for Electromagnetic Scattering of Rough Surface Targets in Terahertz Frequency Band

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 method for modeling and fast calculation of electromagnetic scattering of ultra-electric large-scale targets with rough surfaces in the terahertz frequency band. Background technique [0002] The scattering characteristics of terahertz targets are the fundamental problems faced by active detection using terahertz. Scholars have made fruitful explorations on the calculation method of target scattering characteristics in the terahertz frequency band. However, the existing research usually follows the assumption that the target surface is smooth in the microwave frequency band. difficult to establish. Experimental studies have shown that in the terahertz frequency band, rough surfaces can have a significant impact on the scattering properties of the target. [0003] The precise numerical method based on the Method of Moments ...

AI Technical Summary

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

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