Communications: radio wave antennas – Antennas – Loop type
Reexamination Certificate
2007-03-19
2008-10-28
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Loop type
C343S742000, C343S867000, C324S334000, C324S328000
Reexamination Certificate
active
07443359
ABSTRACT:
Location determination is performed using a transmitter including an elongated generally planar loop antenna defining an elongation axis. The elongation axis is positioned along at least a portion of a path. A magnetic field is then generated which approximates a dipole field. Certain characteristics of the magnetic field are then determined at a receiving position radially displaced from the antenna elongation axis. Using the determined certain characteristics, at least one orientation parameter is established which characterizes a positional relationship between the receiving position and the antenna on the path. The magnetic field may be transmitted as a monotone single phase signal. The orientation parameter may be a radial offset and/or an angular orientation between the receiving position and the antenna on the path. The antenna of the transmitter may be inserted into a first borehole to transmit the magnetic field to a receiver inserted into a second borehole.
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Brune Guenter W.
Chau Albert W.
Mercer John E.
Zeller Rudolf
Ho Tan
Merlin Technology Inc.
Pritzkau Patent Group LLC
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