Composite Electromagnetic Scattering From the Plate Target Above a One-Dimensional Sea Surface: Taking the Diffraction Into Account

Wu, Zhensen; Zhang, Jing-Jian; Zhao, Lei

doi:10.2528/pier09032902

Cited by 21 publications

(14 citation statements)

References 29 publications

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“…When a target is above a three-dimensional (3-D) sea surface at a low altitude, the EM scattering from the sea surface as well as the mutual EM coupling interactions between the sea surface and the moving target has to be considered. 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].…”

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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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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“…High frequency methods such as physical optics (PO), geometrical optics (GO) [26], geometry theory of diffraction (GTD) [27], uniform theory of diffraction (UTD) [28,29], physical theory of diffraction (PTD) [30], method of equivalent currents (MEC) [31][32][33] and Equivalent edge currents (EEC) [34] have been applied to scattering analysis of large target. To model the problem of multiple scattering or coupling between different regions of the object, iterative physical optics (IPO) [35,36] is employed to study scattering problem such as open-ended cavity.…”

Section: Time-domain High Frequency Theory For Combinative Targetmentioning

confidence: 99%

Time-Domain Iterative Physical Optics Method for Analysis of Em Scattering From the Target Half Buried in Rough Surface: Pec Case

Li¹,

Wei²,

He³

et al. 2011

PIER

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Abstract-In this paper, time-domain physical optics (TDPO) method is extended to its iterative version (TDIPO) to consider the coupling effects between two regions, and the latter is employed to investigate electromagnetic scattering from three dimensional target half-buried by a two dimensional rough surface. By using iterative scheme, more accurate transient response reflected from combinative target with multi-scattering effects would be obtained than that by using TDPO alone. The TDIPO could also be enhanced by time-domain equivalent edge current (TDEEC) to further determine the far-field characteristics of the combinative target with rough surface. An accurate composite geometry model technique which combines 2D perfectly electrically conducting (PEC) rough surface and half-buried 3D PEC target is introduced and employed to assist the meshing work. The validity of the presented method is verified by comparing the scattering results for dihedral targets with those obtained through TDPO and finite difference in time domain (FDTD), as well as multi-level fast multiple algorithm (MLFMA). Then simulations of EM scattering from the target embedded in rough surface for different incidence directions are carried out to test the availability of TDIPO/EEC. Discussions on the effects of incidence direction and the presence of the target on the backscattering in farzone are also given.

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“…Some conventional instruments, including the In this paper, the radar estimated results are compared with those data from ADCP and drifter. The differences between two datasets are computed, and their statistics are quantified as follows: 2 ] where x i are the parameters estimated by radar, and y i are recorded by instrument respectively. n is the sample number.…”

Section: Experiments Setupmentioning

confidence: 99%

“…During the last decades multiple radar systems operating in different frequency bands have become useful tools for oceanographic research and target detection due to their remote sensing capability based on the Electromagnetic Scattering Theory [1][2][3]. HF radar takes the vertically polarized electromagnetic wave that "adheres" to the ocean surface and follows the air-water interface around the curvature of the Earth.…”

Section: Introductionmentioning

confidence: 99%

Remote Sensing With TDMF Radar: Some Preliminary Results

Yan

Wu²,

Chen³

2010

PIER Letters

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Abstract-HF radar in ocean remote sensing makes use of electromagnetic waves of 10 m to 100 m wavelength from the rough sea surface to measure surface current and ocean wave parameter. Recently, a new time division multiple frequency HF radar system called OSMAR2009 has been developed by the Wuhan University. One main advantage of the system is that it is of great help in extracting current parameters and significant wave height. A further advantage is the ability to avoid interference. In addition, this technique offers the opportunity to measure the current shear. These advantages are gained by transmitting time division multiple frequency chirp instead of one frequency chirp. This paper introduces the technical design and the advantage of OSMAR2009 and describes the remote sensing experiment implemented in East China Sea during 2009, followed by the field results and the brief analysis of such results.

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Composite Electromagnetic Scattering From the Plate Target Above a One-Dimensional Sea Surface: Taking the Diffraction Into Account

Cited by 21 publications

References 29 publications

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

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

Time-Domain Iterative Physical Optics Method for Analysis of Em Scattering From the Target Half Buried in Rough Surface: Pec Case

Remote Sensing With TDMF Radar: Some Preliminary Results

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