Buried line locator with integral position sensing

Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing

Reexamination Certificate

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C702S094000, C702S097000, C702S150000, C702S189000, C340S854800

Reexamination Certificate

active

07120564

ABSTRACT:
A device for detecting and compensating field distortion in underground line locators by means of mapping the field-strength of the field generated by electrical currents within the buried line. Signals from the underground structure can be mapped with respect to the position of the device. From the map, distortions from the expected signals can be determined, indicating interference from other structures or errors in detected location of the structure.

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Gefsrud, Rick, “Real-Time GPS Land Surveying,” Proceedings of the Annual Meeting. Institute of Navigation. Navigating the 90's: Technology, Application and Policy XX XX, Jan. 1995, pp. 287-929.

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