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Advanced passive interference management in directional drilling system, apparatus and methods

  • US 10,378,338 B2
  • Filed: 06/28/2017
  • Issued: 08/13/2019
  • Est. Priority Date: 06/28/2017
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a transmitter that is configured to move through the ground in a region during an operational procedure while transmitting a depth signal at a depth frequency that is selectable in a depth signal frequency range below 1 KHz to provide at least some immunity to passive interference and which is also subject to electromagnetic noise that can vary within said region; and

    a portable device configured to scan a plurality of frequencies within said depth signal frequency range to measure the electromagnetic noise at each one of the plurality of frequencies and identify a lowest one of the frequencies as a potential depth frequency which satisfies a low noise requirement based on the measured noise.

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