System for using a 2-axis magnetic sensor for a 3-axis compass solution
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United States of America Patent
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Jan 4, 2005
Grant Date -
N/A
app pub date -
Jul 30, 2003
filing date -
Jul 30, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tilt-compensated electronic compass can be realized by calculating rather than measuring Earth's magnetic field component Z in a direction orthogonal to the two measurement axes of a 2-axis magnetic sensor. The orthogonal component Z can be calculated using a stored value for the Earth's magnetic field strength applicable over a wide geographic region. The calculation also requires using measured field values from the 2-axis sensor. Once Z is known, and using input from a 2-axis tilt sensor, compensated orthogonal components X and Y can be calculated by mathematically rotating the measured field strength values from a tilted 2-axis sensor back to the local horizontal plane. Thus, a very flat and compact tilt-compensated electronic compass is possible.
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