Electronic compass
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United States of America Patent
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-
Dec 15, 1998
Grant Date -
N/A
app pub date -
Oct 18, 1995
filing date -
Oct 18, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
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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