Electronic compass and method of calibration

Details Electronic compass and method of calibration Electronic compass and method of calibration

2007-08-28

2007-08-28

Smith, R. Alexander (Department: 2859)

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

C073S001760

Reexamination Certificate

active

11101283

ABSTRACT:
An electronic compass assembly includes a first collection portion and a second collection portion that each collect magnetic field data. The magnetic field data collected by the second collection portion partially overlaps the magnetic field data collected by the first collection portion. A processor module determines a calibration output based upon the magnetic field data from the first collection portion if a first predetermined condition exists and determines the calibration output based upon magnetic field data from the second collection portion if a second predetermined condition exists. An example method for controlling the electronic compass includes calibrating the electronic compass based upon one of a first magnetic field data set or a second, partially overlapping magnetic field data set. In another example, the processor module counts the number of magnetic field data points collected by one of the first magnetic field data set, the second magnetic field data set, or both, and determines a calibration output if the number exceeds a threshold. The processor module then uses acceptance criteria to determine whether to accept or reject the calibration output.

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