Dielectric constant determination using ground-penetrating radar reflection coefficients |
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| Institution: | 1. Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India;2. Ingram School of Engineering, Texas State University, San Marcos, TX 78666, USA;3. Indian Institute of Technology Madras, Chennai 600036, India;4. Ingram School of Engineering, Texas State University, San Marcos, TX 78666, USA;1. University of Minnesota, Department of Civil, Environmental, and Geo-Engineering, 500 Pillsbury Drive S.E. | Minneapolis, MN 55455-0116, United States;2. Minnesota Department of Transportation Office of Materials and Road Research, 1400 Gervais Avenue | Maplewood, MN 55109, United States;3. Federal Highway Administration Office of Pavement Technology, 1200 New Jersey Avenue, SE | Washington, DC 20590, United States;1. Bauman Moscow State Technical University, 2nd Baumanskaya st., 5, 105005, Moscow, Russia;2. Franklin & Marshall College, 17603-3003, Lancaster, PA, USA;3. University of Florence, Via Santa Marta, 3, 50139, Florence, Italy;1. Signal processing for Telecommunications and Economics Lab., Roma Tre University, Via Vito Volterra 62, 00146 Rome, Italy;2. School of Computing and Engineering, University of West London (UWL), St Mary''s Road, Ealing, London W5 5RF, United Kingdom |
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| Abstract: | A method to determine ground-penetrating radar (GPR) velocities, which utilize Brewster angles, is presented. The method determines the relative dielectric constant ratio at interface boundaries where the radar wave is traveling from a low-velocity to a high-velocity medium. Using Brewster angle analysis is currently the only means to determine the velocity of the medium below the deepest detectable reflector. Data are presented for water-saturated clean sand with a known velocity of 0.52 m/ns, which overlays a sandy silt with a known velocity of 0.13 m/ns. Brewster angle analysis of a common midpoint (CMP) survey gives a relative dielectric constant ratio of 33/4.77. The Brewster angle relative dielectric constant ratio is in good agreement with the relative dielectric constant ratio calculated from the known velocities. |
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