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US 2009/0212777 A1Published application
Multi-Frequency Boring Tool Locating System and Method
AssigneeMerlin Technology, Inc.
InventorsGuenter W. Brune, John E. Mercer
Life of this patent
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AssigneeMerlin Technology, Inc.
InventorsGuenter W. Brune, John E. Mercer
Estimating the term…
Arrangements, apparatus and associated methods are described for use in a multi-frequency boring tool locating system. The boring tool includes a transmitter for transmitting a locating signal at two or more selectable frequencies. One set of above ground procedures may be applied to the transmitter in order to change the frequency of the boring tool transmitter. Another set of procedures is applicable for changing the frequency during below ground drilling operations, for example, by subjecting the boring tool to a predetermined roll orientation sequence. An enhanced portable locator operates in a manual or automatic mode to receive locating frequency information transmitted from the boring tool transmitter including frequency updates. Boring tool transmitter, as well as above ground locator shutdown/restart procedures are described relating to multi-frequency operation. A tone detector is described which implements one or more digital match filters.
In a system in which a transmitter is moved through the ground in a region, said system including a locator for tracking the position of and/or guiding the transmitter as the transmitter moves through the ground, a method comprising:
In a system including a transmitter which is moved through the ground in a region, said system further including a locator for tracking the position of and/or guiding the transmitter using the locating signal, said transmitter comprising:
Dependencies are inferred from the claim text.