研究目的
To study the Radar Cross Section (RCS) of modified radar targets (plate with notch) using Gaussian Beam techniques, specifically Gaussian Beam Summation (GBS) and Gaussian Beam Launching (GBL), and validate the numerical simulation results with experimental measurements.
研究成果
The GBS and GBL methods, combined with PTD, accurately model RCS variations for modified radar targets, showing good agreement with MoM and experimental results. These techniques overcome limitations of ray asymptotic methods, such as singularities, and provide a robust approach for high-frequency electromagnetic scattering analysis. Future work should explore applications to dielectric targets.
研究不足
The methods may require high beam numbers for precision, increasing computational cost. Differences in RCS curves at certain angles (e.g., near 80°) indicate potential inaccuracies in modeling edge diffractions. The study is limited to metallic targets and specific frequencies; extension to dielectric targets is suggested for future work.
1：Experimental Design and Method Selection:
The study employs Gaussian Beam Summation (GBS) and Gaussian Beam Launching (GBL) methods for RCS simulation, combined with Physical Theory of Diffraction (PTD) for edge diffraction. Theoretical formulations are derived and compared with Physical Optics (PO) and Method of Moments (MoM).
2：Sample Selection and Data Sources:
A metallic plate with a rectangular notch (30cm x 30cm plate, 15cm x 15cm notch) is used as the radar target. Experimental data is collected in an anechoic chamber at ENSTA Bretagne.
3：List of Experimental Equipment and Materials:
Vectorial Network Analyzer (Anritsu 37347D), NEWPORT positioning system, elevation motor, absorbent material for chamber walls, and a computer for control. The target is meshed using CATIA software.
4：Experimental Procedures and Operational Workflow:
Measurements are performed in monostatic configuration at 10GHz frequency. The positioning system adjusts angles from -90° to 90° with 0.01° resolution. Numerical simulations involve setting beam width (ω0=2λ), beam number (N=200), and incident angles (-80° to 80°).
5：01° resolution. Numerical simulations involve setting beam width (ω0=2λ), beam number (N=200), and incident angles (-80° to 80°).
Data Analysis Methods:
5. Data Analysis Methods: Numerical results from GBS+PTD and GBL+PTD are compared with PO, MoM (using FEKO software), and experimental measurements. Error analysis and RCS variations are evaluated.
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