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E-compass, tilt sensor, memory and processor with coarse detilting procedure

  • US 9,062,971 B2
  • Filed: 03/05/2009
  • Issued: 06/23/2015
  • Est. Priority Date: 03/06/2008
  • Status: Active Grant
First Claim
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1. An electronic circuit comprising:

  • an e-compass oriented with a heading and having e-compass sensors mounted on different axes, the e-compass having sensor circuitry with outputs that supply e-compass sensor data;

    a tilt sensor including sensor circuitry having outputs to supply tilt sensor data;

    memory circuitry having inputs and outputs and holding a tilt angle e-compass calibration parameter, the tilt angle e-compass calibration parameter representing a residual tilt angle e-compass calibration parameter arising from non-idealities in the tilt sensor and remaining after a coarse detilting procedure performed in response to tilt sensor data and on calibration data from the e-compass sensors; and

    electronic processor circuitry having leads coupled to the e-compass sensor outputs and to the memory circuitry outputs, the electronic processor circuitry responsive to the e-compass sensor data and the tilt angle e-compass calibration parameter to generate at least one output signal representing a measured heading of the e-compass corrected using the tilt angle e-compass calibration parameter.

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