Vehicle compass system with variable resolution
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United States of America Patent
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Mar 2, 1999
Grant Date -
N/A
app pub date -
Dec 1, 1995
filing date -
Dec 1, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A vehicle compass system including a magnetic field sensor from which the earth's magnetic field can be detected in two channels of measurement. The sensor is coupled to a processing circuit which samples the sensor data and determines the maximum and minimum signal levels in each channel of measurement during movement of the vehicle through a 360.degree. path of travel. Based on the spans between the maximum and minimum signal levels, adjustment signals are generated for adjusting the resolution of the compass system and the maximum and minimum signal levels of subsequent sensor data so that the system's sensitivity resolution may be adjusted and accurate heading information can be calculated and displayed regardless of the strength of the earth's magnetic field.
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