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Precise location and orientation of a concealed dipole transmitter

  • US 8,188,745 B2
  • Filed: 12/05/2008
  • Issued: 05/29/2012
  • Est. Priority Date: 12/05/2008
  • Status: Active Grant
First Claim
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1. A method for determining the location and orientation of a sonde, the method comprising:

  • measuring a set of complex electromagnetic field magnitude and phase strengths at one or more positions while traversing a target sonde path at any angle using one or more electromagnetic coil sensors;

    modeling a set of expected complex electromagnetic strengths of a hypothetical sonde at each of the one or more positions for one or more of the electromagnetic coil sensors, the set of expected electromagnetic field values corresponding to a model for the target sonde; and

    estimating parameters related to the target sonde based on a residual error between the measured set of complex electromagnetic field values and the modeled set of expected complex electromagnetic field strengths, wherein a final estimated parameter set is determined after the residual error has converged to a minimum tolerance.

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