A hybrid method for electromagnetic scattering from target above composite rough surface of ground and near sea in adjacent region

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

doi:10.1080/02726343.2017.1378486

Cited by 14 publications

(14 citation statements)

References 27 publications

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“…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%

“…A major advantage of this modeling method is that it can guarantee the statistic property of each region remain invariant and connect two areas smoothly. In [34], Pierson-Moskowitz (PM) sea spectrum was chose for build up the surface of deep sea, but in [33], considering the effect of finite water depth in near sea region, JONSWAP spectral function combined with shallow coefficient was utilized to generate the near sea surface. However, there are certain drawbacks associated with the use of this modeling method.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…However, in actual target detection process, the background environment is also an important factor to effect on the total scattering field. Recently, researchers have shown an increased interest in studying the composite scattering characteristics owning to its wide applications such as radar detection, remote sensing and SAR imaging [27]- [29]. When the background environment is considered, numerical methods have to deal with huge number of unknowns.…”

Section: Introductionmentioning

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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“…Since the sizes of leaves and branches are much larger than the wavelength of radar wave in the light wave band, the coupling effect of each scattering component could be neglected in the BRDF models mentioned above. The total scattering field can be assumed as the linear combination of several components based on the optical approximation, which is calculated with semi-empirical shadowing function [7]. Nevertheless, the complex coupling scattering relationship is difficult to be analytically expressed in the microwave band because of resonance scattering in the vegetation layers, and the optical approximation could lead to uncontrollable errors in the scattering model and vegetation parameter retrieval.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Scattering of Rough Ground Surface Covered by Multilayers Vegetation

Yang

Luo

Yin

et al. 2019

International Journal of Antennas and Propagation

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A microwave scattering model is proposed for the ground surface covered with multilayers vegetation. The vegetation leaves are simulated with the discrete elliptical particles in layers, which are randomly distributed above the randomly rough surface. The finite element method is applied to solve the scattering magnetic field equation based on the Dirichlet boundary, and the relationship between the radar cross section and bidirectional reflectance distribution function is deduced with the coherent scattering field. The internal mechanism of microwave scattering of multilayers vegetation is explored with the numerical results, and the relationship of vegetation growing parameter with scattering characteristic is established.

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A hybrid method for electromagnetic scattering from target above composite rough surface of ground and near sea in adjacent region

Cited by 14 publications

References 27 publications

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

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

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

Electromagnetic Scattering of Rough Ground Surface Covered by Multilayers Vegetation

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