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Precise infrastructure mapping using full-waveform inversion of ground penetrating radar signals

  • US 10,234,552 B1
  • Filed: 06/27/2018
  • Issued: 03/19/2019
  • Est. Priority Date: 06/27/2018
  • Status: Active Grant
First Claim
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1. A method for determining physical properties of a subsurface object disposed in a surrounding media, comprising:

  • acquiring measured ground penetrating data from a ground penetrating radar device, wherein the measured ground penetrating data includes at least one measured diffraction hyperbola;

    estimating a plurality of parameters of an initial model of the subsurface object and the surrounding media, such that the initial model produces a simulated diffraction hyperbola that is offset less than one-half a wavelength from the measured diffraction hyperbola, wherein the plurality of parameters includes at least one of the following;

    a velocity of electromagnetic waves through media in which the subsurface object is located;

    a depth of the subsurface object in the surrounding media;

    a horizontal location of the subsurface object;

    a size of the subsurface object;

    a conductivity of the surrounding media;

    a permittivity of the surrounding media;

    a permittivity of any material or fluid within an outer surface of the subsurface object;

    acquiring a measured source wavelet and deconvolving the initial model from the measured ground penetrating data to produce a corrected source wavelet;

    simulating ground penetrating data for the initial model with the corrected source wavelet; and

    determining a cost function and adjusting at least one of the plurality of parameters to minimize the cost function.

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