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System and method of making environmental measurements

  • US 9,846,253 B2
  • Filed: 11/12/2010
  • Issued: 12/19/2017
  • Est. Priority Date: 11/12/2010
  • Status: Active Grant
First Claim
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1. A method comprising:

  • distributing a plurality of transmitters among different locations;

    distributing a plurality of receivers at different structures among different locations;

    collecting signals received at the plurality of receivers in response to activating the plurality of transmitters, the collected signals used to generate a ratio;

    generating the ratio from signals of the collected signals measured at the different structures, the structures subject to perturbative environmental effects and the ratio selected to compensate for the perturbative environmental effects, the signals related to an underground region; and

    performing an inversion operation on the generated ratio to determine parameters of the underground region, wherein for receivers j and k of the plurality of receivers and for transmitters i and k of the plurality of transmitters, the generated ratio includes

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