| US 7,523,559 B2 | ||
| Compass heading noise immunity | ||
| Philippe Fillatreau, Toulouse (France); and Francois-Xavier Bernard, Corronsac (France) | ||
| Assigned to Continental Automotive Systems US, Inc., Auburn Hills, Mich. (US) | ||
| Filed on Apr. 07, 2005, as Appl. No. 11/100,910. | ||
| Claims priority of provisional application 60/560204, filed on Apr. 07, 2004. | ||
| Prior Publication US 2005/0223573 A1, Oct. 13, 2005 | ||
| Int. Cl. G01C 17/38 (2006.01) | ||
| U.S. Cl. 33—356 | 16 Claims |
| 1. A method of controlling an electronic compass assembly comprising:
calibrating at least one magnetic field sensor by collecting magnetic field data points in a computed mathematical form of
an elliptical calibration product;
circularizing the elliptical calibration product to produce a circular calibration product;
in a compass heading process, comparing heading magnetic field data to the circular calibration product to determine whether
a magnetic interference condition exists; and
controlling a display of the vehicle direction based on whether the magnetic interference condition exists.
|