Study of Electromagnetic Scattering From Ship Wakes on Pec Sea Surfaces by the Small-Slope Approximation Theory

Sun, Rong-Qing; Min, Zhang; Wang, Chao; Chen, and Yong

doi:10.2528/pier12041405

Cited by 8 publications

(4 citation statements)

References 36 publications

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“…Electromagnetic scattering from rough surface [8,9] and rough surface with ship target on it [10][11][12][13][14] have been investigated extensively. However, fully polarimetric scattering from sea surface in the presence of ship-induced wake is rarely considered in the existing literatures, although copolarized (HH, VV) scattering from perfect electric conducting (PEC) sea surfaces with ship-induced wakes has been investigated in [15]. This is due mainly to the complexity of geometric modeling of sea surface with ship-generated wake as well as the corresponding fully polarimetric scattering modeling, which is three-dimensional (3D) electrically large problem and is beyond the capability of numerical methods such as method of moments (MoM) [16] and finite-difference timedomain (FDTD) [17].…”

Section: Introductionmentioning

confidence: 99%

Polarimetric Scattering from Two-Dimensional Dielectric Rough Sea Surface with a Ship-Induced Kelvin Wake

Guo

2016

International Journal of Antennas and Propagation

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Based on the polarimetric scattering model of second-order small-slope approximation (SSA-II) with tapered wave incidence for reducing the edge effect caused by limited surface size, monostatic and bistatic polarimetric scattering signatures of two-dimensional dielectric rough sea surface with a ship-induced Kelvin wake is investigated in detail by comparison with those of sea surface without ship wake. The emphasis of this paper is on an investigation of depolarized scattering and enhanced backscattering of sea surface with a ship wake that changes the sea surface geometric structure especially for low wind conditions. Numerical simulations show that in the plane of incidence rough sea surface scattering is dominated by copolarized scattering rather than cross-polarized scattering and that under low wind conditions a larger ship speed gives rise to stronger enhanced backscattering and enhanced depolarized scattering. For both monostatic and bistatic configuration, simulation results indicate that electromagnetic scattering signatures in the presence of a ship wake dramatically differ from those without ship wake, which may serve as a basis for the detection of ships in marine environment.

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Section: Introductionmentioning

confidence: 99%

Polarimetric Scattering from Two-Dimensional Dielectric Rough Sea Surface with a Ship-Induced Kelvin Wake

Guo

2016

International Journal of Antennas and Propagation

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“…The specific environments have great impact on the EM backscattering of the targets as well as the Doppler spectra from them [3][4][5]. Many EM methods have been proposed to calculate the scattering from the target including the influence induced by the background [6][7][8].…”

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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“…Then, the scattered power is decreased. Other solutions tried recently to be developed as the structural HF antenna [6][7][8].…”

Section: Stealth Strategymentioning

confidence: 99%

Perspectives of Hf Half Loop Antennas for Stealth Combat Ships

Koubeissi¹,

Pomie²,

Rochefort³

2013

PIER B

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Abstract-Based on technical analysis and budget link experimentation, the main purpose here is to show improvement of HF half loop antennas in terms of signal-to-noise ratio (SNR) and stealthy for a combat ship. A special designed HF antenna brings a high quality communication over 1000 NM. A suitable integration of a HF half loop antenna at ship corners contributes to the ship stealthy. This paper shows the antenna performance and the benefit of the completely body integrated HF half loop antenna regarding whip antennas. The corresponding SNR is 15 to 20 dB better than for a conventional antenna.

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Study of Electromagnetic Scattering From Ship Wakes on Pec Sea Surfaces by the Small-Slope Approximation Theory

Cited by 8 publications

References 36 publications

Polarimetric Scattering from Two-Dimensional Dielectric Rough Sea Surface with a Ship-Induced Kelvin Wake

Polarimetric Scattering from Two-Dimensional Dielectric Rough Sea Surface with a Ship-Induced Kelvin Wake

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

Perspectives of Hf Half Loop Antennas for Stealth Combat Ships

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