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Bore location system and method of calibration

  • US 6,854,535 B1
  • Filed: 12/03/2002
  • Issued: 02/15/2005
  • Est. Priority Date: 12/03/2002
  • Status: Active Grant
First Claim
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1. A method for calibrating a horizontal underground bore location system, said method comprising the steps of:

  • a. aligning a probe in a bore head, said probe having a pitch sensor that measures deviation between a first predetermined orientation and a measurement axis defined by the pitch sensor and having a transmitter that radiates an electromagnetic signal that carries the deviation measured by the pitch sensor, by aligning a longitudinal axis of the bore head with said first predetermined orientation and placing the probe into the bore head and aligning said measurement axis with said first predetermined orientation by adjusting the probe'"'"'s position in the bore head;

    b. providing a receiver that receives the electromagnetic signal and detects said measured deviation;

    c. aligning the receiver in a second predetermined orientation with respect to the probe;

    d. measuring said deviation between said first predetermined orientation and said measurement axis in cooperation with adjusting the probe'"'"'s position in the bore head to minimize the deviation;

    e. receiving, at the receiver, the electromagnetic signal radiated from the probe and deriving said deviation measured at step (d) therefrom; and

    f. after minimizing the deviation, storing said deviation derived at step (e) in memory as a calibration error.

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