Patent ID: 6364035
Filing Date: 2002-04-02
Classification: B82Y,E21B,G01R,G01V,H01Q

Abstract:
In a system in which a boring tool is moved through the ground in a region, an improvement forming part of an arrangement for tracking the position and/or guiding the boring tool using an electromagnetic locating signal which is transmitted from the boring tool as the boring tool moves through the ground, the improvementat least two detectors located at fixed positions within said region, each being operable in a transmit mode and in a receive mode such that each one of said detectors in the transmit mode is able to transmit a relative locating signal to the other detector for use in determining the relative position of one detector in relation to the other and such that both detectors receive the electromagnetic locating signal in the receive mode for use in determining the position of the boring tool within said region.