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Digital signal receiver for measurement while drilling system having noise cancellation

  • US 20020180613A1
  • Filed: 11/13/2001
  • Published: 12/05/2002
  • Est. Priority Date: 05/08/2000
  • Status: Active Grant
First Claim
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1. A method for reducing noise in a measured telemetry signal, comprising:

  • tracking a characteristic of at least one harmonic of a noise component in the measured telemetry signal, the at least one harmonic having a frequency outside a telemetry signal band;

    determining the characteristic of the noise component for at least one other harmonic thereof, the at least one other harmonic having a frequency inside the telemetry signal band, and generating a noise reference therefrom; and

    combining the noise reference with the measured telemetry signal to generate a noise-canceled telemetry signal.

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