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Controlling an underground object

  • US 6,980,123 B2
  • Filed: 06/23/2003
  • Issued: 12/27/2005
  • Est. Priority Date: 02/22/1999
  • Status: Expired due to Term
First Claim
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1. An underground boring apparatus, comprising:

  • a boring tool;

    a sonde associated with the boring tool, the sonde comprising an electromagnetic transmitter that transmits electromagnetic radiation, a sensor that senses a predetermined rotation sequence of the sonde, and a processor that changes the frequency of transmission of the electromagnetic radiation in response to sensing of the predetermined rotation sequence by the sensor; and

    a boring tool device that drives the boring tool and for applying the predetermined rotation sequence to the boring tool.

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