- 标题
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[IEEE 2018 International Conference on Radar (RADAR) - Brisbane, Australia (2018.8.27-2018.8.31)] 2018 International Conference on Radar (RADAR) - Radar Cross Section of Modified Target Using Gaussian Beam Methods: Experimental Validation
摘要： The aim of this paper is to study the Radar Cross Section (RCS) of modified radar targets (plate with notch) using Gaussian Beam techniques. The Gaussian methods used in this work are Gaussian Beam Summation (GBS) and Gaussian Beam Launching (GBL). We establish the theoretical formulation of the GBS and GBL techniques and analyze the influence of the main Gaussian beam parameters on the variation of the scattered field. Then, we present the simulations of RCS. The numerical results are compared with PO, MoM methods, and also with experimental measurements performed in the anechoic chamber at Lab-STICC (ENSTA Bretagne).
关键词： Radar Cross Section (RCS),Physical Theory of Diffraction (PTD),Physical Optic (PO),Gaussian Beam Summation (GBS),Gaussian Beam Launching(GBL),Method of Moment (MoM)
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - MLFMA-ACA Based Method for Efficient Calculation of Scattering from Underground Targets
摘要： Electromagnetic (EM) non-destructive evaluation (NDE) of underground targets is of great significance for the safety of urban construction. Succesful detection of underground targets during construction depends on the accurate and efficient simulation of wave propagation. Among the most popular numerical methods in electromagnetics, surface integral equation (SIE) based method of moments (MoM) is used to simulate the scattering from underground targets in this paper. While MoM has high computational complexity O(N^2) and memory cost O(N^2) if iterative solver is applied, where N is the number of unknowns. As one of the most efficient fast algorithms, multi-level fast multi-pole algorithm (MLFMA) is used to reduce the computational complexity and memory cost. However, MLFMA is more difficult to calculate in this case because of the coupling action between rough surface and target has its limitations. So, adaptive cross approximation (ACA) is used to solve this problem. In this paper, a hybrid method combining MLFMA and ACA (MLFMA-ACA) is proposed to compute the scattering from underground targets. While MLFMA is used to compress the coupling matrix between rough surface and target, ACA is added to compress the coupling matrix between different media targets. The combination between them can build a more efficient method to compute scattering from underground targets.
关键词： method of moment,multi-level fast multi-pole algorithm,Adaptive cross approximation,electromagnetic scattering,underground target
更新于2025-09-23 15:22:29
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Cavity model-based analysis of field propagation in a six-port Riblet-type directional coupler
摘要： A cavity model-based analysis of electric field propagation inside a six-port Riblet-type directional coupler has been presented in this paper. Though cavity modeling technique is not very new and was previously applied to different rectangular waveguide-based passive networks to find their network parameters, for the first time it has been used here to analyze the field propagation inside a six-port Riblet-type directional coupler. From the analysis, the frequency response of the network has been estimated. Since the main objective of this work is to analyze the field propagation inside a passive network, not to present another network, a six-port Riblet-type directional coupler that is already proposed in literature has been considered. The numerical analysis has been verified by comparing the scattering parameters data obtained from the cavity model analysis with CST Microwave Studio simulation data and measured data available in the literature.
关键词： Riblet-type directional coupler,cavity modeling technique,Aperture field distribution,method of moment,scattering parameters
更新于2025-09-09 09:28:46