Ray-Launching Geometrical Optics in FEKO: A Summary of the Last Four Years of Intensive Development

Aguilar, Andres G.; Jakobus, U.

doi:10.23919/acess.2018.8669256

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…Scattered wave signals for 3D ISAR formation were collected via simulation. The method of moments and the multilevel fast multipole method are widely used for scattering analysis [14]. However, these full-wave numerical analysis methods are deficient in that the calculation time increases rapidly as the number of meshes rises during high-frequency analysis or in cases wherein the target is relatively large.…”

Section: Simulation and Analysis Of Resultsmentioning

confidence: 99%

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Using the CLEAN Method in Three-Dimensional Polarimetric ISAR Imaging Based on Volumetric Scattering Points

Lee,

Noh,

Yook

2024

J. Electromagn. Eng. Sci

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We developed a new technique for generating three-dimensional monostatic inverse synthetic aperture radar (ISAR) images using various types of polarimetric information on targets. To remove clutter around a target, we adopted the CLEAN method, in which only the main signals were reconstructed using an iterative algorithm. We conducted a simulation as follows: electric field data that were subjected to polarimetric scattering were obtained for the target using a full-wave electromagnetic analysis simulator. The linear polarization data of a 2 × 2 matrix were compressed into the linear to circular polarization data of a 2 × 1 matrix using the Jones vector based on circular polarization. On the grounds of the post-processed data, inverse Fourier transform was carried out to map scattering points to the spatial domain, after which the CLEAN method was used to retain only the primary scattering points.

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Section: Simulation and Analysis Of Resultsmentioning

confidence: 99%

“…These problems drove us to use ray launching geometrical optics (RL-GO), an approximation method similar to the shooting and bouncing rays method, which is specialized for high-frequency and large-target analysis [14,15]. To this end, the radar parameters in Table 1 were used.…”

Section: Simulation and Analysis Of Resultsmentioning

confidence: 99%

Using the CLEAN Method in Three-Dimensional Polarimetric ISAR Imaging Based on Volumetric Scattering Points

Lee,

Noh,

Yook

2024

J. Electromagn. Eng. Sci

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“…This study is performed using the parametric models on ANSYS, based on the ideas above. [ 19,20 ] The divided triangular elements in the 20‐face design are shown in Figure 10.…”

Section: Plate Divisions For a Truss Radome Surfacementioning

confidence: 99%

Design and structural analysis of a 70‐m metal space‐frame radome

Liu

2020

Structural Design Tall Build

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Summary The electrical performance of an antenna is usually affected by the stiffness, intensity, and stability of the radome structure. Thus, radome structural analysis is of great concern to designers. Taking a 70‐m radome structure to be built in the future with a 50‐m aperture antenna structure as the study platform, its mechanical behavior and electrical properties are analyzed and discussed. First, a detailed introduction regarding the method and principle of radome partitioning is presented. Based these methods, random divisions on radome plates are conducted using a specially developed program, and thereby, a whole spherical‐segment model is established. In addition, focusing on the finite element model of a steel radome structure, static mechanical, seismic response, modality, and stability analyses are performed, such that the member sections of the radome structure, adopting two kinds of materials, are determined. The results show that the mechanical properties of the structure are superior and that all indices meet the requirements in the safety evaluation. Just as noteworthy, the influencing mechanism of structural deformation of the radome on electrical performance is examined, and in particular, the reason why large deformation does not greatly degrade electrical performance is presented. Subsequently, a novel method for describing deformation is put forth to accurately estimate the effects of structural deformation on electrical performance. These achievements provide references for structural design and construction as well as maintenance of similar common metal space‐truss radomes.

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Efficient and Rapid Modeling of Radar Echo Responses for Complex Targets under Arbitrary Wideband Excitation

Hua,

He,

et al. 2024

Remote Sensing

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In practical radar applications, the diversity of wideband transmission signals presents a significant challenge for radar target recognition systems. Traditional electromagnetic (EM) simulation methods often require the point-by-point sampling of target echo signals under specific radiation sources, and this process must be repeated for different transmission signals. This results in extensive EM computations and low computational efficiency. Additionally, the physical attribute information of the target is often obscured within the simulated echoes, complicating feature extraction. To address these issues, we propose a novel method for the efficient and rapid modeling and analysis of complex target time-domain echoes based on a forward scattering center model. This method constructs an impulse response model of the target under unit impulse signal excitation, representing the inherent scattering properties of the target and remaining unaffected by changes in the radiation source. Subsequently, this model is convolved with arbitrary wideband input signals to quickly reconstruct the wideband echo signals of the target. Numerical examples validate the accuracy and effectiveness of the proposed model. This method offers several advantages: firstly, it provides high computational efficiency by quickly convolving with the input signals, thereby avoiding the extensive EM calculations required by traditional methods due to changes in the radiation source. Secondly, it achieves significant data compression; the proposed echo model only requires the model parameters to be calculated at the central frequency point, enabling the rapid reconstruction of target echo data across a wideband range and effectively reducing storage requirements. Finally, it presents clear and complete physical attributes by employing a “cause-to-effect” forward-modeling approach, where the model parameters fully represent the inherent physical properties of the target. This effectively addresses the issue of physical interpretability in optical region radar target recognition.

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Ray-Launching Geometrical Optics in FEKO: A Summary of the Last Four Years of Intensive Development

Cited by 3 publications

References 1 publication

Using the CLEAN Method in Three-Dimensional Polarimetric ISAR Imaging Based on Volumetric Scattering Points

Using the CLEAN Method in Three-Dimensional Polarimetric ISAR Imaging Based on Volumetric Scattering Points

Design and structural analysis of a 70‐m metal space‐frame radome

Efficient and Rapid Modeling of Radar Echo Responses for Complex Targets under Arbitrary Wideband Excitation

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