Flux plane locating in an underground drilling system

  • US 6,496,008 B1
  • Filed: 08/17/2000
  • Issued: 12/17/2002
  • Est. Priority Date: 08/17/2000
  • Status: Expired due to Term
First Claim
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1. In an overall system in which a boring tool is moved through the ground within a given region along a path while transmitting a locating field such that the locating field exhibits a pair of locate points at the surface of the ground, one forward of the boring tool and the other to the rear of the boring tool, a method for guiding an operator to each of the locate points using a portable locator, said portable locator including a display and said method comprising the steps of:

  • a) measuring the intensity of the locating field with the portable locator at an initial above ground point and with the portable locator in a particular orientation;

    b) using the measured intensity of the locating field to determine a predicted location of the nearest one of the locate points in proximity to the portable locator at the initial above ground point; and

    c) with the portable locator in said particular orientation, displaying on the portable locator a positional relationship including the predicted location of the nearest locate point relative to the portable locator having a directional indication such that the displayed directional indication points in the actual direction of the predicted location from the initial above ground point.

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