Electromagnetic Wave Interaction of Conducting Object with Rough Surface by Hybrid SPM/MOM Technique

Zhang, Y.; Yang, Yilin; Braunisch, Henning; Kong, Jin Au

doi:10.2528/pier98112506

Cited by 45 publications

(40 citation statements)

References 25 publications

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“…Some methods have been to deal with the problem, taking for example, the "four-path" method [1], the image technique [2], the high-frequency method [3], and the calculation technique based on physical optics approximation [4] have been investigated for a target above a flat surface. The hybrid SPM/MOM technique [5] and the method of moments [6] are employed to calculate the scattering of target above on a rough surface. The finite-element method with domain decomposition and generalized forward-backward method [7,8] were analyzed for the electromagnetic scattering from target located above an ocean-like rough surface.…”

Section: Introductionmentioning

confidence: 99%

FDTD Investigation on Bistatic Scattering From a Target Above Two-Layered Rough Surfaces Using Upml Absorbing Condition

Li¹,

Guo²,

Zeng³

2008

PIER

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Abstract-This paper presents an investigation for the electromagnetic scattering characteristic of the 2-D infinitely long target located above two-layered 1-D rough surfaces. A finite-difference time-domain (FDTD) approach is used in this study, and the uniaxial perfectly matched layer (UPML) medium is adopted for truncation of FDTD lattices, in which the finite-difference equations can be used for the total computation domain by properly choosing the uniaxial parameters. The upper and lower interfaces are characterized with Gaussian statistics for the height and the autocorrelation function. For the composite scattering of infinitely long cylinder and underlying single-layered rough surfaces as an example, the angular distribution of scattering coefficient with different incident angles is calculated and it shows good agreement with the numerical result by the conventional method of moments. And the influence of some parameters related to the twolayered rough surfaces and target on composite scattering coefficient is investigated and discussed in detail.

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Section: Introductionmentioning

confidence: 99%

FDTD Investigation on Bistatic Scattering From a Target Above Two-Layered Rough Surfaces Using Upml Absorbing Condition

Li¹,

Guo²,

Zeng³

2008

PIER

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“…This is a typical composite scattering problem which has been widely studied [9,10]. In pervious studies, there are two main types of algorithms based on integral equation method, one applies half space Green function in a specified environment [11,12], the other uses an iterative method which calculates the EM scattering from the target and the sea surface separately, then solves the mutual EM coupling between those two parts using an iterative process [13,14]. The former type of algorithms spends lots computation time on finding the half space Green function which varies with the movement of sea surface.…”

Section: Introductionmentioning

confidence: 99%

Numerical Approach on Doppler Spectrum Analysis for Moving Targets Above a Time-Evolving Sea Surface

Qi¹,

Zhao

Nie³

2013

PIER

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Abstract-In order to analyze the Doppler spectrum of threedimensional (3-D) moving targets above a time-evolving sea surface, a hybrid method with acceleration techniques is proposed to simulate the electromagnetic (EM) scattering from the composite moving model. This hybrid iterative method combines Kirchhoff approximation (KA) and the multilevel fast multipole algorithm (MLFMA) to solve the EM backscattering from the rough sea surface and the targets, respectively, then mutual EM coupling effects between them are taken into account through an iterative process. To overcome the vast computational cost in the iterative process, acceleration approaches which can greatly reduce the calculation time are applied. Coupling area on the sea surface is truncated according to geometrical optic principle. Then a fast far-field approximation (FAFFA) is applied to speed up the mutual interactions between the targets and the sea surface. A successive iteration method is proposed to reduce the convergence steps for the MLFMA process. The accuracy and efficiency of this hybrid method with accelerations are demonstrated. Doppler spectra of backscattering signals obtained from such numerical EM simulations are compared for different incident angles, target velocities and surface models. The broadening effects of the Doppler spectra due to the mutual EM coupling interactions are studied.

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“…For the targets and rough surface composite scattering, considerable contributions have been made and several methods have been presented during these years, such as MOM [14,15], parallel MOM [16], finite-element (FEM) method [17], finite difference time domain (FDTD) method [18], hybrid SPM/MOM technique [19], hybrid KA/MOM technique [20], hybrid PO/MOM technique [21], reciprocity theorem [22], Generalized forward-backward method (GFBM) [23,24], Mode-expansion method [25], fast iterative approach [26], bidirectional analytic ray tracing method [27], etc. Although the aforementioned numerical methods are of respective important advantages, but some of them are fast but not exact enough, or some of them are exact but not fast enough, therefore, it should be make sense in contributing efforts to investigate and attempt to improve the efficiency and accuracy of the adoptive scheme.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Numerical Characterization of Scattering From Target in a Dielectric Rough Soil Surface

Yu¹,

Zeng²,

Guo³

et al. 2013

PIER

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Abstract-Based on the Propagation-Inside-Layer Expansion (PILE) and Forward-Backward method (FBM), the composite scattering from the target below a dielectric rough soil surface using the extended PILE (EPILE) combined with the Forward-Backward method (FBM) is studied. The accuracy and efficiency of the EPILE + FBM for this specific type of composite scattering is researched by comparing with the method of moments (MOM), the influences of the target size, target depth, target horizontal distance, the rms height, the correlation length, the incident angle and the soil moisture content, etc., to the bistatic scattering coefficient (BSC) are also investigated.

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Electromagnetic Wave Interaction of Conducting Object with Rough Surface by Hybrid SPM/MOM Technique

Cited by 45 publications

References 25 publications

FDTD Investigation on Bistatic Scattering From a Target Above Two-Layered Rough Surfaces Using Upml Absorbing Condition

FDTD Investigation on Bistatic Scattering From a Target Above Two-Layered Rough Surfaces Using Upml Absorbing Condition

Numerical Approach on Doppler Spectrum Analysis for Moving Targets Above a Time-Evolving Sea Surface

An Investigation on Numerical Characterization of Scattering From Target in a Dielectric Rough Soil Surface

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