Patent ID: 6286222
Filing Date: 2001-09-11
Classification: G01C

Abstract:
An electronic compass system for eliminating magnetic noise comprising:a vehicle accessory having at least one electrical state, said vehicle accessory generating a known, consistent, magnetic field of an intensity sufficient to cause a static magnetic offset in said electronic compass;a magnetic field sensor located in proximity to said vehicle accessory, said magnetic field sensor detecting a combination of The Earth's magnetic field and said known, consistent, magnetic field and generating a magnetic field signal wherein said The Earth's magnetic field is modified by said static magnetic offset;a controller coupled to said magnetic field sensor and receiving said magnetic field signal, said controller having control logic operative to command said vehicle accessory to change electrical states, lookup a predetermined correction factor for said electrical state stored in a memory location, and apply said predetermined correction factor to said magnetic field signal; anda display coupled to said controller, said display displaying a heading unaffected by said static magnetic offset.