High-frequency RCS of complex radar targets in real-time

Rius, J.M.; Ferrando, M.; Jofre, L.

doi:10.1109/8.247759

Cited by 143 publications

(54 citation statements)

References 9 publications

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“…GRECO method was introduced by Rius in 1993 [12]. It can be integrated with CAD geometric modeling package and high-frequency theory for RCS prediction.…”

Section: Graphical Processing In Real-timementioning

confidence: 99%

“…The impact on current of the shadow region is small; however, in some applications the scattering of their contributions can not be ignored. In this case, we use graphical-electromagnetic computing method [12] to compute the bistatic scattering of illuminated facets, then the shadow facets were calculated by improved current marching technique. Combined with their respective advantages, the improved method avoids spending a lot of memory and time solving the bistatic scattering of complex targets.…”

Section: Bistatic Scattering In Shadow Regionmentioning

confidence: 99%

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Bistatic RCS Prediction for Complex Targets Using Modified Current Marching Technique

Li¹,

Xie²,

Yang³

2009

PIER

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Abstract-The improved high-frequency method for solving the bistatic scattering from electrically large conductive targets is presented in this paper. Since the previous physical optical methods overlooked the current impact of shadow zone and led to the increasing problems of the large angle bistatic calculation, the improved method is deduced by introducing the current marching technique into the conventional physical optical method. Combined with the graphicalelectromagnetic computing method that extracted the illuminated and shadow facet in accordance with the direction of the incident sort iteration, one may calculate the bistatic radar cross-section of a conductive targets object. The numerical results show that this method is efficient and accurate.

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“…GRECO method was introduced by Rius in 1993 [12]. It can be integrated with CAD geometric modeling package and high-frequency theory for RCS prediction.…”

Section: Graphical Processing In Real-timementioning

confidence: 99%

Section: Bistatic Scattering In Shadow Regionmentioning

confidence: 99%

Bistatic RCS Prediction for Complex Targets Using Modified Current Marching Technique

Li¹,

Xie²,

Yang³

2009

PIER

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“…The size of pixel, the frequency, the direction of incidence and observation, and the direction of incident and observational polarization are parameters as input for the EEC Shader. The Ufimtsev PTD coefficients could be obtained using a very simple linear approximation in the GRECO method [3]. However, the PTD coefficients are only valid in observational direction of the Keller cone.…”

Section: The Eec Shadermentioning

confidence: 99%

“…One popular and effective method is the high-frequency approximations [1][2][3][4][5][6], such as Geometrical Optics (GO), Physical Optics (PO) [7][8][9][10][11], Shooting and bouncing rays (SBR) [12][13][14], and other diffraction or scattering methods [15,16]. The visibility computing that detects the surfaces or wedges of the target visible from the radar direction is a complex and time-consuming part of the high-frequency techniques [17,18], while Graphical electromagnetic computing (GRECO) [3] method solves this problem effectively using the Z-Buffer of the workstation graphics hardware, which is one of the most popular hidden surface removal algorithms in computer graphics. The Physical Optical (PO) and Physical Theory of Diffraction (PTD) are used to compute the first-order far field scattered from visible surfaces and wedges in the GRECO method, respectively.…”

Section: Introductionmentioning

confidence: 99%

From Cpu to Gpu: Gpu-Based Electromagnetic Computing (Gpueco)

Tao¹,

Lin²,

Bao³

2008

PIER

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Abstract-In this paper, we provide a new architecture by using the programmable graphics processing unit (GPU) to move all electromagnetic computing code to graphical hardware, which significantly accelerates Graphical electromagnetic computing (GRECO) method. We name this method GPUECO. The GPUECO method not only employs the hidden surface removal technique of graphics hardware to identify the surfaces and wedges visible from the radar direction, but also utilizes the formidable of computing power in programmable GPUs to predict the scattered fields of visible surfaces and wedges using the Physical Optical (PO) and Equivalent Edge Current (EEC). The computational efficiency of the scattered field in fragment processors is further enhanced using the Z-Cull and parallel reduction techniques, which avoid the inconsistent branching and the addition of the scattered fields in CPU, respectively. Numerical results show excellent agreement with the exact solution and measured data and, the GPUECO method yields approximately 30 times faster results.

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“…During the last four years, the development of graphical processing techniques for high-frequency monostatic RCS prediction has given rise to GRECO code (1), (2), (3). Real-time computation is achieved through graphical processing of an image of the target present at the screen of a workstation, using the hardware capabilities of a 3-D graphics accelerator.…”

Section: Graphical Electromagnetic Computing (Greco)mentioning

confidence: 99%

Multiple reflections and improvement of edge scattering in GRECO RCS prediction code

Rius¹,

Vall-Ilossera²,

Jofre³

1993

23rd European Microwave Conference, 1993

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GRECO code for monostatic RCS prediction in real time has been extended by considering multiple reflections between surfaces and improving the edge diffraction coefficients. Multiple reflections are analysed through a very efficient ray-tracing algorithm based on the graphical processing technique. Method of equivalent currents for edge scattering has been improved by Mitzner's and Michaeli's incremental length diffraction coefficients (ILDC).This communication presents the general features of GRECO code, in particular the advantages of the new graphical processing technique. Emphasis will be placed in the new features of GRECO still unpublished: the ray-tracing algorithm and the implementation of incremental length diffraction coefficients. Graphical Electromagnetic Computing (GRECO)During the last four years, the development of graphical processing techniques for high-frequency monostatic RCS prediction has given rise to GRECO code (1), (2), (3). Real-time computation is achieved through graphical processing of an image of the target present at the screen of a workstation, using the hardware capabilities of a 3-D graphics accelerator. The two main advantages of the graphical processing approach over classical techniques are: a) Hardware graphics accelerator removes hidden surfaces and edges: they do not contribute to the surface or line integrals when they are performed by the graphical processing technique. b) Reduced CPU time and RAM requirements. They are independent of target electrical size and complexity. The main features of GRECO code are the following:a) The I-DEAS computer aided design package for geometric modelling of solids has been used for modelling target geometry. The target is described as a collection of parametric surfaces, defined with two-dimensional NURBS (non-uniform rational Bsplines). Parametric surfaces require less mass storage memory that the faceting approach, and adjust more accurately to the real target surface. b) Physical Optics (PO) approach for perfectly conducting surfaces and Impedance Boundary Condition (IBC) + Physical Optics for radar absorbent coatings. c) Method of Equivalent Currents (MEC) with either Physical Theory of Diffraction (PTD), Mitzner's or Michaeli's Incremental Length Diffraction Coefficients (ILDC) for perfectly conducting edges. A comparative study of the results for the three kinds of ILDC's will be presented in this communication.d) Double reflection analysis by geometric optics (GO) raytracing for the first reflection and bistatic physical optics for the second. A new and very efficient ray-tracing algorithm has been developed and will be also presented in this communication. Ray-TracingDouble reflections between surfaces are analysed by a hybrid GO-PO scheme. The GO reflection at the first surface assumes that specular reflection occurs, according to stationary phase principle. The PO reflection at the second surface ensures that the correct scattered field is obtained when there is no specular reflection to the observer.For each pixel on...

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High-frequency RCS of complex radar targets in real-time

Cited by 143 publications

References 9 publications

Bistatic RCS Prediction for Complex Targets Using Modified Current Marching Technique

Bistatic RCS Prediction for Complex Targets Using Modified Current Marching Technique

From Cpu to Gpu: Gpu-Based Electromagnetic Computing (Gpueco)

Multiple reflections and improvement of edge scattering in GRECO RCS prediction code

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