Patent ID: 6525538
Filing Date: 2003-02-25
Classification: E21B,G01C,G01V

Abstract:
An above-ground portable locator for locating an elongated boring tool positioned underground and within a region, said boring tool including a transmitter arrangement which transmits within said region an electromagnetic dipole orientation signal, said locator comprising:(a) a receiver arrangement including at least first and second antennae positioned transverse to one another, said first and second antennae simultaneously sensing at least respective first and second orthogonal components of said electromagnetic orientation signal, said receiver arrangement producing respective first and second, at least substantially simultaneous, electrical signals, which last-mentioned electrical signals are functions of said first and second orthogonal components sensed by said first and second antennae; and (b) an electronic processor for receiving said electrical signals at least substantially simultaneously and configured for responding to movement of the above ground portable locator, which movement causes variation in the electrical signals, as detected by the portable locator, for using the electrical signals to determine the location of said transmitter within said region.