An FDTD-Based Parallel Virtual Tool for RCS Calculations of Complex Targets

Çakır, Gonca; Çakır, Mustafa; Sevgi, Levent

doi:10.1109/map.2014.6971919

Cited by 15 publications

(3 citation statements)

References 20 publications

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“…The top ones correspond to the resonance RCS regime, the bottom ones belong to quasi-optical RCS regimes. As observed, angular sensitivity increases as the frequency increases from resonance to optical regimes [42].…”

Section: Rcs In Resonance Regimesupporting

confidence: 62%

Modeling and Simulation Challenges in Wide Ocean Area Surveillance

Sevgi

2019

IEEE Access

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Wide ocean area surveillance using high frequency surface wave radar(s) is discussed in this paper. Theoretical and practical issues and problems are reviewed. Modeling and simulation challenges such as ionospheric clutter mitigation, ocean clutter, surface wave propagation over multi-mixed paths, EM scattering and RCS characteristics of surface and air targets, and signal detection and tracking are presented.

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Section: Rcs In Resonance Regimesupporting

confidence: 62%

Modeling and Simulation Challenges in Wide Ocean Area Surveillance

Sevgi

2019

IEEE Access

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“…Full-wave simulation methods based on Maxwell's equations are extensively applied for accurate RCS estimations [21,22]. All these calculations require a substantial investment of computational resources in real applications, as a result, it is difficult to meet design targets in a short time through full-wave EM simulators.…”

Section: Introductionmentioning

confidence: 99%

An efficient parameter-retrieval-based surrogate-assisted optimization of on-platform honeycomb absorbing structures

Yang,

Yu,

Cui

2024

J. Phys. D: Appl. Phys.

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An electromagnetic (EM) parameter-retrieval-based surrogate-assisted optimization (PSAO) algorithm is presented to reduce radar cross section (RCS) by optimizing the on-platform honeycomb absorbing structures. To facilitate the optimization process, the honeycomb structure is transformed to an anisotropic homogeneous slab, and the effective parameters of the slab are extracted by the retrieval algorithm. A multi-fidelity model is employed to reduce the computing-time consumption, in which a Gaussian process (GP) regression model is used as the substitute for the coarse model. The GP model establishes a relationship between the geometry of the honeycomb structure and the RCS response of the target coated with the equivalent slab. Finally, the optimization result of the fine model is achievedthrough a space mapping strategy. The accuracy of the parameter extraction algorithm is verified by analyzing the honeycomb absorbing structure. Subsequently, the proposed optimization method is applied to a metal plate and a metal cylinder, resulting in a 10dB reduction of RCS in broadband and wide-angle scenarios. This demonstrates the applicability of the proposed PSAO algorithm to both planar and conformal on-platform honeycomb absorbing structures. Furthermore, an NACA0015 oil is analyzed, showing an average RCS reduction of 10 dB and a minimum RCS reduction of 5dB in the X-band. These results indicate that the PSAO approach can effectively apply tocomplicated targets. Additionally, the proposed method exhibits significant advantages in terms of computational accuracy and efficiency compared to the traditional genetic algorithm.

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“…In this model, it is possible to analyze EM problems directly in the time domain for a broad range of frequencies with one simulation. While the total field FDTD representation is used in antenna and propagation modeling, RCS modeling necessitates scattered field FDTD formalism[2],[6]-[8].FDTD-based RCS modeling and simulation is performed as follows[2],[6]-[8]: ■ The target, located in the compu-H{ for desired directions are extrapolated by using Stratton-Chu equations (i.e., equivalent currents) over a closed virtual surface surrounding the target. a u g u s t 2 0 1 5…”

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confidence: 99%

MATLAB-Based 3-D MoM and FDTD Codes for the RCS Analysis of Realistic Objects [Testing Ourselves]

Sefer

Uslu

Sevgi

2015

IEEE Antennas Propag. Mag.

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T hree-dimensional (3-D) MAT-LAB-based codes are developed for radar cross-section (RCS) modeling and simulation (MODSIM) using method of moments (MoM) and finite-difference time-domain (FDTD) approaches. Any object can realistically and comparatively be investigated.Electrical engineering education and training necessities electromagnetic (EM) MODSIM approaches [1]-[3]. Modeling and simulation has long been discussed in this magazine both as feature articles and as tutorials in this column. Multipurpose two-dimensional (2-D) FDTD-based education/training tools have been developed and shared with the reader [4], [5]. A series of articles [6]-[8] discussed RCS modeling and simulation and presented 3-D FDTD-based RCS packages. Finally, MATLAB-based 2-D FDTD codes were introduced to the use of the reader who is interested in EM MODSIM.This brief tutorial aims to revisit RCS modeling and simulation using two wellknown approaches, FDTD and MoM, and introduces novel simple MAT-LAB-based 3-D codes (RCS_MoM.m, RCS_FDTD.m), which can be freely downloaded from http://leventsevgi.net/ index.php?page=testingourselves. The Problem STaTemenTThe classical RCS modeling and simulation scenario is shown in Figure 1. Here, a target is located at the origin of the Cartesian coordinate system and illuminated by a plane wave. The plane wave may be a continuous waveCW) or a short pulse in time. A CW (narrow-band) illumination makes a frequency-domain method applicable. Short-pulse illumination necessitates time-domain transient analysis plus Fourier transformation. The plane The tutorial in this issue belongs to radar cross-section (RCS) modeling of realistic targets using three-dimensional method of moments (MoM) and finite-difference, time-domain (FDTD) approaches. Ahmet Sefer and Mehmet Alper Uslu have prepared MATLAB-based MoM and FDTD codes, respectively, for this purpose. As you might remember, we have recently shared MATLABbased FDTD codes together with the two tutorials published here [1], [2]. Those tutorials have been on the magazine's most downloaded list since then. Lecturers, researchers, and graduate students may easily modify/adapt these codes and use for their research. As we discussed in [3], numerical electromagnetics has become essential in teaching electromagnetic in the 21st century. Good news for the readers who are interested in electromagnetic modeling and simulation: both codes (RCS_MoM.m and RCS_FDTD.m) can be downloaded from my personal web page (http://leventsevgi.net/index.php?page=testingourselves) or can be obtained from the authors upon request. References[1] G. Toroglu and L. Sevgi, "Finite difference time domain (FDTD) MATLAB codes for the first and second order EM differential equations, "

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An FDTD-Based Parallel Virtual Tool for RCS Calculations of Complex Targets

Cited by 15 publications

References 20 publications

Modeling and Simulation Challenges in Wide Ocean Area Surveillance

Modeling and Simulation Challenges in Wide Ocean Area Surveillance

An efficient parameter-retrieval-based surrogate-assisted optimization of on-platform honeycomb absorbing structures

MATLAB-Based 3-D MoM and FDTD Codes for the RCS Analysis of Realistic Objects [Testing Ourselves]

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