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System for testing accuracy of electronic compass

  • US 7,987,606 B2
  • Filed: 08/04/2009
  • Issued: 08/02/2011
  • Est. Priority Date: 03/21/2009
  • Status: Active Grant
First Claim
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1. A system for testing accuracy of an electronic compass, the system comprising:

  • a circular track;

    a compass seat surrounded by the circular track, the electronic compass being installed on the compass seat;

    an electromagnetic element movably disposed on the circular track;

    a driver configured for driving the electromagnetic element to move along the circular track;

    a power source for powering the electromagnetic element so that the electromagnetic element generates a magnetic field, the electronic compass measuring the magnetic field and calculating direction relative to the magnetic field at a plurality of points of the circular track when driven to move along the circular track and outputting a plurality of magnetic densities and a plurality of directional results, each of which is associated with a corresponding point of the circular track;

    a calculator configured for comparing the magnetic densities and the directional results with a plurality of ideal values to determine the accuracy of the electronic compass; and

    a magnetic shielding chamber for shielding the electromagnetic element and the electronic compass from interference of external magnetic fields.

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