Vehicle compass with automatic continuous calibration
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United States of America Patent
Stats
-
Sep 4, 1990
Grant Date -
N/A
app pub date -
May 27, 1987
filing date -
May 27, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicle compass includes a magnetic field sensor for mounting within a vehicle and providing two output channels of information representing orthogonal direction sensing of the earth's magnetic field within the vehicle. The sensor is coupled to an electrical circuit including a microprocessor for sampling the data from each of the two channels and providing a plurality of tests to determine if the rate of change of data is within a prescribed limit thereby indicating valid data is being received. Further, the data is tested to determine the maximum and minimum signal levels during movement of the vehicle through a completed 360.degree. path of travel and for calculating therefrom the compass compensation information used to provide a corrected heading display.
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Family
International Classification(s)
Cited Art Landscape
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