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http://dx.doi.org/10.5515/KJKIEES.2013.24.1.98

Effects of Antenna Modeling in 2-D FDTD Simulation of an Ultra-Wide Band Radar for Nondestructive Testing of a Concrete Wall  

Joo, Jeong-Myeong (Department of Electronic Information and Communication Engineering, Hongik University)
Hong, Jin-Young (Department of Military Electronic Communication, Yeungjin College)
Shin, Sang-Jin (Samsung Thales)
Kim, Dong-Hyeon (Samsung Thales)
Oh, Yisok (Department of Electronic Information and Communication Engineering, Hongik University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.24, no.1, 2013 , pp. 98-105 More about this Journal
Abstract
This paper presents a finite-difference time-domain(FDTD) simulation and a data processing technique for radar sensing of the internal structure of a wall using an ultra-wide band antenna. We first designed an ultra-wide band anti-podal vivaldi antenna with a frequency range of 0.3~7 GHz which is chosen to be relatively low after considering the characteristics of wave attenuation, wall penetration, and range resolution. In this study the two-dimensional FDTD technique was used to simulate a wall-penetration-radar experiment under practical conditions. The next, the measured radiation pattern of the practical antenna is considered as an equivalent source in the FDTD simulation, and the reflection data of a concrete wall and targets are obtained by using the simulation. Then, a data processing technique has been applied to the FDTD reflection data to get a radar image for remote sensing of the internal structure of the wall. We compared the two different source excitations in the FDTD simulation; (1) commonly-used isotropic point sources and (2) polynomial curve fitting sources of the measured radiation pattern. As a result, when we apply the measured antenna pattern into the FDTD simulation, we could obtain about 2.5 dB higher signal to noise level than using a plane wave incidence with isotropic sources.
Keywords
Wall Penetrating Radar; FDTD Simulation; Vivaldi Antenna; Measured Pattern;
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