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System for evaluating an environment

  • US 20080234533A1
  • Filed: 03/21/2007
  • Published: 09/25/2008
  • Est. Priority Date: 03/21/2007
  • Status: Abandoned Application
First Claim
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1. A system for evaluating an environment, said system comprising:

  • (a) a first magnetic field sensor to sense a first component of a magnetic field in a first direction;

    (b) a second magnetic field sensor to sense a second component of said magnetic field in a second direction normal to said first direction;

    (c) a third magnetic field sensor to sense a third component of said magnetic field in a third direction normal to said first and said second directions;

    (d) a first accelerometer to sense a first acceleration in said first direction;

    (e) a second accelerometer to sense a second acceleration in said second direction; and

    (f) a processing unit responsive to a program instruction to measure said first, said second and said third components of said magnetic field, said first acceleration, and said second acceleration and determine a compass direction from said measured components of said magnetic field and said measured acceleration.

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