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Proceedings Paper

Step-frequency radar imaging for nondestructive evaluation (NDE) and ground-penetrating radar (GPR) applications
Author(s): William H. Weedon; Weng Cho Chew; Chad A. Ruwe
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Paper Abstract

We describe a step-frequency microwave radar imaging system that is suitable for nondestructive evaluation (NDE) and ground-penetrating radar (GPR) applications. The system includes a computer-automated microwave measurement apparatus along with nonlinear inverse scattering imaging algorithms. Through the use of an inverse Fourier transform, the SFR data is transformed into a synthetic time-domain pulse, and imaging algorithms are applied to the time-domain data. A calibration procedure involving the use of calibration targets is described in order to remove pulse distortions due to the effective aperture and dispersive nature of the antennas, as well as those distortions due to connectors, transmission lines, directional couplers and amplifiers. Reconstructions of various metallic and dielectric scattering objects including metallic rods, glass rods and plastic PVC pipes from real measurement data collected in our laboratory are shown.

Paper Details

Date Published: 14 September 1994
PDF: 12 pages
Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); doi: 10.1117/12.186711
Show Author Affiliations
William H. Weedon, Univ. of Illinois/Urbana-Champaign (United States)
Weng Cho Chew, Univ. of Illinois/Urbana-Champaign (United States)
Chad A. Ruwe, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 2275:
Advanced Microwave and Millimeter-Wave Detectors
Satish S. Udpa; Hsiu C. Han, Editor(s)

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