التفاصيل البيبلوغرافية
| العنوان: |
Accurate Determination of Underground GPR Wavefront and B-Scan Shape From Above-Ground Point Sources. |
| المؤلفون: |
Rappaport, Carey M. |
| المصدر: |
IEEE Transactions on Geoscience & Remote Sensing; Aug2007, Vol. 45 Issue 8, p2429-2434, 6p, 1 Black and White Photograph, 1 Diagram, 7 Graphs |
| مصطلحات موضوعية: |
GROUND penetrating radar, REMOTE sensing, RADAR, SURFACE waves (Fluids), DIELECTRICS, EQUATIONS, RADIO wave propagation |
| مستخلص: |
While the determination of the wavefront shape radiated by ground-penetrating radar (GPR) in contact with the ground is trivial, the refraction of rays at the ground surface from a point source in the air makes accurate determination of the transmitted wavefront challenging. Impulse GPRs usually have their emitters in air, transmitting waves through a quasi-planar interface into the soil. The waves radiated initially in air can be approximated as circular, but once they enter the soil half-space, they propagate with a wavefront shape that resembles a hyperbola. The exact shape is derived and shown to be well approximated by a hyperbola with specific parameters depending on the relative dielectric constant of the half-space ϵ± (= n²), the height of the source h, and the propagation time from source to wavefront multiplied by the wave velocity in the half-space p. A correction formula is provided to reduce the error between the approximate hyperbola and the exact shape. In addition, an equation for the shape of the B-scan contour of a point scatterer is derived. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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