Bistatic Scattering From Two-Dimensional Dielectric Ocean Rough Surface With a Pec Object Partially Embedded by Using the G-SMCG Method

Ji, Wei-Jie; Tong, Chuangming

doi:10.2528/pier10041101

Cited by 26 publications

(20 citation statements)

References 27 publications

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“…In order to solve efficiency the linear system (20), the impedance matrix is expressed from sub-matrices as [14] …”

Section: The E-pile Methodsmentioning

confidence: 99%

“…For instance, the sparse matrix/canonical grid algorithm (SMCG) of Tsang et al with the complexity of O(N log N ) in [9][10][11], the novel acceleration forward backward method (FB/NSA) of Torrungrueng et al with the complexity of (O(N )) in [12], the steepest descent fast multi-pole method (SDFMM) of Jandhyala et al with the complexity of (O(N )) in [13]. In [14], the general sparse matrix/canonical grid algorithm (G-SMCG) is introduced to compute the electromagnetic scattering from object on ocean surface. For the problem of an object under a rough surface, the interaction between rough surface and object must be considered.…”

Section: Introductionmentioning

confidence: 99%

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The E-Pile+smcg for Scattering From an Object Below 2d Soil Rough Surface

Ji¹,

Tong²

2011

PIER B

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Abstract-A rigorous fast numerical method called E-PILE+SMCG is introduced and then used in a Monte Carlo study of scattering from a three dimensional perfectly electrical conductor (PEC) object below lossy soil rough surface. This method is the three dimensional (3D) extendability of PILE (Propagation-Inside-Layer Expansion) method which is proposed for two dimensional (2D) scattering problem. The rough surface with Gaussian profile is used to emulate the realistic situation of statistically rough surface, while the tapered incident wave is chosen to reduce the truncation error. The 3D angular correlation function (ACF) and bistatic scattering coefficient (BSC) are studied and applied to the detection of a target embedded in the clutter. The ACF is computed by using numerical method with circular azimuthal angle averaging technique. Because of its success in suppressing the clutter scattering, the technique appears attractive in real life implementation.

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“…In order to solve efficiency the linear system (20), the impedance matrix is expressed from sub-matrices as [14] …”

Section: The E-pile Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The E-Pile+smcg for Scattering From an Object Below 2d Soil Rough Surface

Ji¹,

Tong²

2011

PIER B

Self Cite

View full text Add to dashboard Cite

show abstract

“…Here we focus on the bistatic scattering rather than the conventionally considered backscatter, since the evaluation of emissivity calls for bistatic scattering coefficient [18], as well as the growing trend of bistatic applications [19][20][21]. The findings, although by nature are for 2-D scattering from 1-D ocean surface due to computer limitations, can nevertheless be expected to provide valuable insight into the full 3-D surface scattering problem.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Two-Scale and Three-Scale Models for Bistatic Electromagnetic Scattering From Ocean Surfaces

Luo¹,

Du²

2013

PIER

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Abstract-With rapid development of satellite technology in monitoring the ocean, a good understanding of the physical processes involved in the electromagnetic ocean-surface interaction is required. The composite surface models are usually applied in the analysis of the interaction, hence a systematical check of their region of validity is desirable. Based on a generalized minimal residual procedure which is right preconditioned (GMRES-RP) that we have recently developed which has demonstrated the desirable properties of a numerical algorithm: robust and efficient, in this paper, for bistatic scattering from one dimensional ocean surfaces, we carry out a systematic assessment of the performance of the popular two-scale model and the advanced three-scale model under different conditions of ocean surface wind speeds, polarizations, frequencies, and incidence angles. It is found that the two-scale model in general captures the bistatic scattering pattern, yet the accuracy of geometrical optics (GO) for the large scale wave brings considerable impact on the overall accuracy. If the evaluation of the contribution of the large scale wave is instead using direct numerical integration for the corresponding Kirchhoff integral, impressive improvements are frequently observed, especially at low frequency (L and C bands) and low wind speed (3 m/s). But care should be taken when apply two-scale method with numerical integration, since there are cases where visible discrepancy with method of moment (MoM) are observed. On the other hand, the threescale model is found in very good agreement with MoM across the considered ocean surface wind speeds, polarizations, frequencies, and incidence angles, hence represents a much advanced model over the two-scale model.

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“…As a method to improve the calculation efficiency, steepest descent fast multipole method (SDFMM) has been implemented together with MoM to study the electromagnetic scattering by 3D objects near a rough surface [9,10]. Also, various hybrid techniques have been formulated for studying the 3D scattering problems, including a hybrid MoM and sparse matrix canonical grid (SMCG) method [11], a hybrid MoM and modified PO algorithm [12], and a hybrid Kirchhoff approximation and MoM [13][14][15]. All of these numerical and hybrid techniques are developed and employed for solving the scattering problems in frequency domain.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Scattering From Three-Dimensional Objects Buried Below a Random Rough Surface by Monte-Carlo MPSTD Method

Liu¹,

Dai²,

Xu³

2013

PIER B

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Abstract-This paper presents a Monte-Carlo multidomain pseudospectral time-domain (MPSTD) algorithm developed for the analysis of scattering from a three dimensional (3D) object buried below a random rough surface separating two half spaces. In the development, special attention is paid to the 3D computation domain decomposition and subdomain mapping involving the random rough surface as well as the subdomain patching along the rough surface. The Mote-Carlo MPSTD algorithm is then employed to determine the scattering of 3D objects of various shapes and electromagnetic properties; embedded in the lower half space with different permittivity and the roughness of the random rough surface may vary. Sample numerical results are presented, validated, and analyzed. Through the analysis, it is observed that the roughness of the random rough surface and the electromagnetic properties of the lower half space can significantly affect the scattered signature of the buried object.

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Bistatic Scattering From Two-Dimensional Dielectric Ocean Rough Surface With a Pec Object Partially Embedded by Using the G-SMCG Method

Cited by 26 publications

References 27 publications

The E-Pile+smcg for Scattering From an Object Below 2d Soil Rough Surface

The E-Pile+smcg for Scattering From an Object Below 2d Soil Rough Surface

Comparison of the Two-Scale and Three-Scale Models for Bistatic Electromagnetic Scattering From Ocean Surfaces

Analysis of Scattering From Three-Dimensional Objects Buried Below a Random Rough Surface by Monte-Carlo MPSTD Method

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