NDLI: Subsurface permittivity estimation from ground-penetrating radar measurements

Content Provider	IEEE Xplore Digital Library
Author	Walker, P.D. Bell, M.R.
Copyright Year	2000
Description	Author affiliation: Purdue Univ., West Lafayette, IN, USA (Walker, P.D.)
Abstract	Ground penetrating radar (GPR) has been the focus of a surge of research activity during the last ten years, largely due to its utility in applications such as geological and civil surveying, and locating buried ordnance. The recent development of low cost, low power pulse-echo scanned GPR systems has also made GPR systems affordable imaging tools. One conventional method for acquiring subsurface GPR data is to scan an antenna array over the region to be probed to acquire monostatic or multistatic space-time echoes of the subsurface scatterers. The data can then be processed to form an easily interpretable twoor three-dimensional image of the scanned region. Many algorithms for imaging objects in a weakly inhomogeneous dielectric halfspace using microwaves have been studied. These methods are applicable to GPR since many subsurface scenes may be approximately modeled as perturbations interspersed throughout clutter in an otherwise homogeneous background. The effectiveness of each imaging method depends on the accuracy of the estimate of the electromagnetic wave velocity in the background material. We propose a method for estimating the ground's background velocity which accounts for an air-gap between the aperture and the air-ground interface, as in reflection coefficient measurement, but which does not require a plate calibration. This method is an autofocusing technique which exploits Fourier processed backscatter from point scatterers buried beneath the surface. Unlike time-of-flight methods, it also accounts for diffractive effects.
Starting Page	341
Ending Page	346
File Size	549094
Page Count	6
File Format	PDF
ISBN	0780357760
DOI	10.1109/RADAR.2000.851857
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-05-12
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Permittivity Ground penetrating radar Electromagnetic scattering Radar scattering Microwave imaging Focusing Surges Geology Costs Antenna arrays
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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