High Efficiency Iterative Solver for Modeling Composite Rough Surface Electromagnetic Scattering

Sun, Hua Long; Tong, Chuangming; Zou, Gao Xiang

doi:10.1080/02726343.2017.1279113

Cited by 12 publications

(8 citation statements)

References 19 publications

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“…Size of terrestrial environment is L x × L y : 80 λ × 80 λ . Aiming at overcoming the truncation effect of rough surface, a tapered incident beam is applied whose 3D form can be found in Reference 29. The rough surface is generated by using Gaussian spectral function, whose root mean square height (RMS) and correlation length in x ‐axis and y ‐axis are set as h rms = 0.1 λ and l x = l y = 1.0 λ . In this paper, the terrestrial environment is homogeneous lossy material, and its relative permittivity is set as

ε_{r} = ((),, 10.952, - normalj 5.825)

when sand's content equals to 60.0%, clay's content equals to 15.5%, volumetric water content m v is 20% and temperature is 22°C, which is computed based on the semi‐empirical formulas proposed in 30 .…”

Section: Numerical Simulation and Discussionmentioning

confidence: 99%

Brewster effect of super‐low altitude target above terrestrial environments using modified facet‐based weighted four‐path model

Zou

Tong

Sun

et al. 2021

Int J RF Mic Comp-Aid Eng

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A modified facet‐based weighted four‐path model is presented to analyze the Brewster effect of super‐low altitude target above terrestrial environments. In this approach, the facet‐based weighted four‐path model (FWFPM) is established to simulate the mutual interactions between the super‐low altitude target and terrestrial environment. Gauss antenna radiation pattern is introduced to modify the FWFPM. The hybrid PO‐MEC method is applied, where the physical optics (PO) is utilized to calculate the scattering field from each facet, and the method of equivalent currents (MEC) is used to compute the scattering field from the edge structure. The validation of the proposed method is verified by the example of a super‐low altitude missile model above a rough surface. The Brewster effect of a super‐low altitude aircraft above diverse terrestrial environments is studied. Moreover, the influences of relative permittivity, the roughness of environment, and the target's height on Brewster angle have been analyzed in detail to provide some useful conclusions.

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ε_{r} = ((),, 10.952, - normalj 5.825)

Section: Numerical Simulation and Discussionmentioning

confidence: 99%

Brewster effect of super‐low altitude target above terrestrial environments using modified facet‐based weighted four‐path model

Zou

Tong

Sun

et al. 2021

Int J RF Mic Comp-Aid Eng

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“…Working frequency is set as 1GHz; Size of environment isL x × L y : 10λ×10λ; Gauss rough surface is PEC surface; Here, statistic parameters of Gauss rough surface are: h rms = 0.1λ and l x = l y = 2.0λ; The radius of PEC sphere is 0.8λ; The height of sphere above the rough surface is 2.0λ. In this paper, a tapered incident beam is introduced in order to circumvent artificial truncation effects [37], and the 3-D form of it [38] is given as follow Figure 2 shows the bi-static scattering coefficient of the PEC sphere and PEC rough surface based method of conventional MOM and FMM, where it can be seen that they are in good agreements. The corresponding numbers of the unknowns in target region and environment region are 5528 and 29833.…”

Section: Verification Of Hybrid Sie-ka-fmm Methodsmentioning

confidence: 99%

Analysis of Electromagnetic Scattering From Combined Conducting and Dielectric Objects Above Rough Surface Using Hybrid SIE-KA-FMM Method

et al. 2019

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An efficient hybrid SIE-KA-FMM method is presented to analyze the electromagnetic scattering from combined conducting and dielectric objects above the rough surface. In this approach, the induced electric current on the rough surface is obtained by the Kirchhoff approximation (KA). The single integral equation (SIE) method is utilized to efficiently compute scattering from the composite target with markedly reducing the numbers of unknowns compared with the conventional coupled integral equation method. The fast multi-pole method (FMM) is incorporated for faster operation and less memory requirement. Several examples verify the validation of the hybrid SIE-KA-FMM method. The composite scattering characteristics of diversiform targets above the rough surface are obtained. Moreover, the numerical results with the different permittivity of dielectric part, polarization mode, working frequency, root mean square (RMS) and correlation length of rough surface, incident pitching/azimuth angle, and target height and target category have been analyzed to provide some useful conclusions. INDEX TERMS Kirchhoff approximation, single integral equation, fast multi-pole method, combined conductor and dielectric objects, rough surface, composite scattering.

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“…We utilize the 3-D form of tapered incident beam, and the concrete forms are given in the Equation ( 8) in Ref. [32]. In Figure 1, θ and φ denote pitching angle and azimuth angle, respectively.…”

Section: μ Ground Rough Surface Near Sea Surfacementioning

confidence: 99%

“…Previous works about divisional environment modeling in our research group have been proposed, e.g., the modeling method for the water zone embedded in land surface [32], ground and near sea in adjacent region [33] and island in deep sea [34]. A borderline modeling method of fractal boundary for divisional environment has been proposed in [35].…”

Section: Introductionmentioning

confidence: 99%

Research on Electromagnetic Scattering Characteristics of Combined Conducting and Dielectric Target Above Coastal Environment

et al. 2020

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The electromagnetic (EM) scattering characteristics of target above coastal environment are complicated due to the simultaneous existence of ground region and sea region. Nevertheless, the actual target possesses both conducting part and dielectric part. Such a composite scattering problem involves multiple media parameters and large amount of unknowns. Hence, aiming at accurately and efficiently calculating the EM scattering from combined conducting and dielectric target above coastal environment, the hybrid SIE-KA method is introduced in which single integral equation (SIE) method is utilized to reduce the number of combined target's unknowns and Kirchhoff approximation (KA) is applied to obtain induced electric and magnetic current on the surface of coastal environment. Moreover, multilevel fast multipole algorithm (MLFMA) is adopted to significantly reduce the computational cost and memory requirement. Several numerical examples demonstrate the accuracy and efficiency of the hybrid method. Finally, the EM scattering characteristics of combined conducting and dielectric target above coastal environment have been studied. The radar cross section (RCS) curves with different category of environment, polarization mode, working frequency, statistic parameters of coastal environment, permittivity of target's dielectric part, target's height and target category have been analyzed in detail to provide some useful conclusions. The approach and results can be broadly applied in remote sensing simulation of coastal environment with combined target. INDEX TERMSCoastal environment; electromagnetic scattering; Kirchhoff approximation; single integral equation; multilevel fast multipole algorithm; combined conducting and dielectric target

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High Efficiency Iterative Solver for Modeling Composite Rough Surface Electromagnetic Scattering

Cited by 12 publications

References 19 publications

Brewster effect of super‐low altitude target above terrestrial environments using modified facet‐based weighted four‐path model

Brewster effect of super‐low altitude target above terrestrial environments using modified facet‐based weighted four‐path model

Analysis of Electromagnetic Scattering From Combined Conducting and Dielectric Objects Above Rough Surface Using Hybrid SIE-KA-FMM Method

Research on Electromagnetic Scattering Characteristics of Combined Conducting and Dielectric Target Above Coastal Environment

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