Electronic compass

Details Electronic compass Electronic compass

1995-10-18

1998-12-15

Barlow, Jr., John E.

Data processing: measuring, calibrating, or testing

Calibration or correction system

Direction

702 94, 702150, 33356, 33361, G01C 1738

Patent

active

058506241

ABSTRACT:
An electronic compass (10) for use in a boring tool (12) which will provide an orientation of the boring tool relative to the earth's magnetic field. In addition, a more straightforward left or right deviation from an initial bearing can be determined. The invention can correct for pitch angle and roll angle variation as well. The magnetic field is sensed by an axial magnetic field (12), a radial magnetic field sensor (18) and a plane-normal magnetic sensor (24) which are preferably magnetoresistive sensors.

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