Electronic compass
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United States of America Patent
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-
Jul 20, 1999
Grant Date -
N/A
app pub date -
Oct 6, 1997
filing date -
Oct 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic compass includes at least two coil assemblies. Each coil assembly has a magnetic axis which is oriented at a known angle to that of the other coil. Each coil assembly has a pair of substantially identical coils having magnetic axes that are parallel in a reverse sense. The compass further includes an oscillator which oscillates at a frequency which is dependent upon the inductances of the coils. A current source causes current to flow in the coils and a switch alternately couples the current source to each of the coils of the coil assemblies. A processor analyzes the frequencies of oscillation of the oscillator when each of the coil assemblies is coupled to the current source in order to compute geographic orientation based upon the analysis.
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