Electromagnetic modeling for ground-penetrating imaging radar (GPIR) using 3-D finite difference time-domain (FDTD) modeling codes

Scott D. Nelson

doi:10.1117/12.186715

14 September 1994 Electromagnetic modeling for ground-penetrating imaging radar (GPIR) using 3D finite difference time-domain (FDTD) modeling codes

Scott D. Nelson

Author Affiliations +

Proceedings Volume 2275, Advanced Microwave and Millimeter-Wave Detectors; (1994) https://doi.org/10.1117/12.186715
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

An analysis of the one-, two-, and three-dimensional electrical characteristics of structural cement and concrete is presented. This work connects experimental efforts in characterizing cement and concrete in the frequency and time domains with the Finite Difference Time Domain (FDTD) modeling efforts of these substances. These efforts include electromagnetic (EM) modeling of simple lossless homogeneous materials with aggregate and targets and the modeling dispersive and lossy materials with aggregate and complex target geometries for Ground Penetrating Imaging Radar (GPIR). Two- and three-dimensional FDTD codes (developed at LLNL) were used for the modeling efforts. The purpose of the experimental and modeling efforts is to gain knowledge about the electrical properties of concrete typically used in the construction industry for bridges and other load bearing structures. The goal is to optimize the performance of a high-sample-rate impulse radar and data acquisition system and to design an antenna system to match the characteristics of this material. Results show agreement to within 2 dB of the amplitudes of the experimental and modeled data while the frequency peaks correlate to within 10% -- the differences being due to the unknown exact nature of the aggregate placement.

Citation Download Citation

Scott D. Nelson "Electromagnetic modeling for ground-penetrating imaging radar (GPIR) using 3D finite difference time-domain (FDTD) modeling codes", Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); https://doi.org/10.1117/12.186715

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