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Bore location system

  • US 7,151,376 B2
  • Filed: 01/27/2006
  • Issued: 12/19/2006
  • Est. Priority Date: 09/08/2000
  • Status: Expired due to Term
First Claim
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1. A system for locating a horizontal bore below a ground surface, said system comprising:

  • a transmitting source configured to radiate from said bore a dipole magnetic field aligned with said bore;

    a receiver remote from said transmitting source and having a first coil and a second coil, each coil defining an axis, wherein said axes of said first coil and said second coil are orthogonal to each other; and

    a measurement device in communication with said coils and configured tomeasure the magnitude of signals induced on said coils by said magnetic field when said coils are disposed above said transmitting source, anddetermine the yaw of said transmitting source relative to said axis of one of said coils responsively to said magnitudes of said signals on said first coil and said second coil.

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