Reliable Approach for Composite Scattering Calculation From Ship Over a Sea Surface Based on FBAM and GO-PO Models

Min, Zhang; Zhao, Ye; Li, Jinxing; Wei, Pengbo

doi:10.1109/tap.2016.2633066

Cited by 54 publications

(27 citation statements)

References 27 publications

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“…k is the wavenumber in space, d is the thickness of coated layer. The permittivity and permeability of the medium can be expressed as By applying equations (8) and (9), J and M can be obtained which can calculate the far-field of the coated targets. On the other hand, GO tracks the field intensity of rays, and the reflection field intensity can be obtained from the modifying reflection coefficient.…”

Section: B the Methods Of Modifying The Surface Reflection Coefficientmentioning

confidence: 99%

Application of CUDA-Accelerated GO/PO Method in Calculation of Electromagnetic Scattering From Coated Targets

2020

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In this study, fast calculations for the electromagnetic (EM) scattering of complex targets coated by radar absorbing materials have been reported. The Geometric Optics and Physical Optics (GO/PO) methods are combined with the modified surface reflection coefficient method, to solve the problem of EM scattering. Moreover, two acceleration techniques have been employed to improve the efficiency of computations. Firstly, the neighbor search technique is adopted to accelerate the ray tracing process in GO/PO. In this technique, an Octree structure is applied to divide the space into multiple subspaces, namely sub-nodes, where the efficiency of ray tracing can be improved through Morton code transform. In order to further reduce the computational time, parallel acceleration technique, based on GPU platform within the Compute Unified Device Architecture (CUDA) framework is introduced. Our proposed method has been verified from the nice correlation of simulated and multilevel fast multipole method (MLFMM) and CPUbased GO/PO methods. The runtime is compared with that of GO/PO method in serial model, responsible for a good speedup ratio. Finally, the influence of coating thicknesses and types of material on the EM scattering characteristics of the coated targets are also analyzed.

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Section: B the Methods Of Modifying The Surface Reflection Coefficientmentioning

confidence: 99%

Application of CUDA-Accelerated GO/PO Method in Calculation of Electromagnetic Scattering From Coated Targets

2020

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“…e scattering contribution from sea surface in this study is computed based on the facet-based asymptotical model (FBAM) proposed in our earlier work [18]. e scattering contribution from the ship target and the coupling scattering contribution between target and sea surface are computed by the GO-PO method; more details can be found in [14] proposed in our earlier work. Although the GO-PO method is an effective method to calculate the multiple scattering of targets and the coupling scattering between sea surface and target, it still faces the difficulty that the lower efficiency of testing the visibility factors I t vis,l , I t vis,nl , I st vis,mn , I s vis,m , and I ts vis,lm (which are shown in Figure 1) due to the enormous number of triangular patches on the composite scene and the complex structures of the ship target.…”

Section: Em Scattering Model Of Sea Surface and Targetmentioning

confidence: 99%

“…Due to the problems of huge memory consumption and low computational efficiency, the numerical methods are difficult to handle the composite scattering modeling for the complex target over a larger sea surface, which have a big disparity to the engineering application of actual problem. Another kind of methods are based on the high frequency hybrid algorithm, such as the four path model (FPM) [7,8], the iterative physical optics (IPO) method [9], the shooting and bouncing ray (SBR) algorithm [10], the hybrid Kirchhoff approximation and Method of Moment (KA-MoM) algorithm [11], the bidirectional analytic ray-tracing (BART) method [12], the extended propagation-inside-layer expansion (E-PILE) method [13], the geometrical optics and physical optics (GO-PO) method [14], and so on. Each of these approaches has its merit and demerit.…”

Section: Introductionmentioning

confidence: 99%

“…Relevant studies on the application of the kd-tree method to the composite model of a larger sea surface and complex target is still not sufficient and even very little. erefore, in order to improve the efficiency of the GO-PO method in calculating the scattering of the ship target and the coupling scattering between sea surface and ship target, this paper applies the kd-tree method [15][16][17] to optimize and improve the GO-PO method [14] proposed in our earlier work. When applying the kd-tree method, the simulation scene should be divided into multilevel subbounding boxes to construct the kd-tree.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Composite EM Scattering from Sea Surface with Ship Based on Kd-Tree Accelerated Hybrid Model

Zhao

Ren

2019

International Journal of Antennas and Propagation

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A hybrid model based on the geometrical optics and physical optics (GO-PO) method and facet-based asymptotical model (FBAM) for the composite EM scattering from sea surface with ship has been previously developed. But, the GO-PO method faces a difficult problem that the lower efficiency in testing the visibility of patches to the incident and reflected waves. Hence, to improve the computation efficiency of the GO-PO method, a kd-tree accelerated hybrid model is presented in this paper. The kd-tree method firstly carries out the intersection test between the ray and the bounding box where the patch is located before the operation between the ray and the patch. If the distance parameters of the bounding box do not meet the requirement, the ray is not necessary to enter the bounding box, which can reduce the needless intersection tests. Numerical results show that the proposed kd-tree accelerated hybrid model could improve the efficiency about three times and could be applied to the study of composite EM scattering characteristics of electrically large sea surface with a ship target.

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“…For the simulation of 3D sea clutter, the FBAM proposed in our earlier work [11] is an available EM scattering model, which has been very well validated. It not only can be used to the RCS prediction and Doppler spectrum analysis of the sea surface [19], but also can be applied to the composite scattering and synthetic aperture radar (SAR) imagery simulation from a ship target over a sea surface [20].…”

Section: Simulation Models For 3d Sea Cluttermentioning

confidence: 99%

Rapid Simulation of Temporal-Spatial Correlated 3D Sea Clutter

Zhao

Ren

Zhu

2019

International Journal of Antennas and Propagation

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Due to the difficulties in actual measurement of sea clutter and uncertainties of experimental data, the electromagnetic (EM) scattering model becomes a better alternative means to acquire the sea clutter. However, the EM scattering model still faces the problems of huge memory consumption and low-computational efficiency when dealing with the large size of sea surface or the long time case. Thus, this paper presents a statistical model to simulate the temporal-spatial correlated three-dimensional (3D) sea clutter, which is based on the statistical properties obtained from the EM scattering model, such as probability density function and correlation function. The comparisons show that the texture feature, autocorrelation function, and PDF of the sea clutter simulated by the statistical model have a good agreement with the results given by the EM model. Furthermore, the statistical model is with high efficiency and can be used to simulate the large scene or long time temporal-spatial correlated 3D sea clutter.

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Reliable Approach for Composite Scattering Calculation From Ship Over a Sea Surface Based on FBAM and GO-PO Models

Cited by 54 publications

References 27 publications

Application of CUDA-Accelerated GO/PO Method in Calculation of Electromagnetic Scattering From Coated Targets

Application of CUDA-Accelerated GO/PO Method in Calculation of Electromagnetic Scattering From Coated Targets

Study on the Composite EM Scattering from Sea Surface with Ship Based on Kd-Tree Accelerated Hybrid Model

Rapid Simulation of Temporal-Spatial Correlated 3D Sea Clutter

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