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Gyro aided magnetic compass

  • US 6,842,991 B2
  • Filed: 07/11/2003
  • Issued: 01/18/2005
  • Est. Priority Date: 07/31/2002
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a geomagnetic sensor for sensing a heading and providing a corresponding first heading signal;

    an angular velocity sensor for sensing motion and outputting a corresponding angular velocity signal;

    a signal integrator communicatively coupled to the angular velocity sensor to receive the angular velocity signal and output a second heading signal; and

    a processing unit communicatively coupled to the geomagnetic sensor and signal integrator, the processing unit configured to receive an initial reference heading from the geomagnetic sensor, generate a hybrid heading signal based on the initial reference heading and the second heading signal, and blend the first heading signal with the hybrid heading signal at an adaptive time interval, wherein said adaptive time interval varies based upon the presence of magnetic compass errors as determined by said processing unit.

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