Patent Number: 8,025,109

Title: Method for establishing the positions of a transmitter and detector in a region

Abstract: A method is described for tracking the position, orientation and/or guiding a transmitter as it moves through the ground in a region. The transmitter transmits an electromagnetic locating signal received by a detector. The detector, with the transmitter at a start position, receives the signal to produce a first set of electromagnetic data. The transmitter moves to a second position. The detector receives the signal with the transmitter at the second position to produce a second set of electromagnetic data. Absolute positions of the detector and the transmitter are determined within the region using certain information including the first and second sets of electromagnetic data.

Inventors: Brune; Guenter W. (Bellevue, WA), Hambling; Peter H. (Bellevue, WA), Mercer; John E. (Kent, WA), Moore; Lloyd A. (Renton, WA), Ng; Shiu S. (Kirkland, WA), Zeller; Rudolf (Seattle, WA)

Assignee: Merlin Technology, Inc.

International Classification: E21B 47/02 (20060101)

Expiration Date: 2019-09-27 0:00:00