COMPENSATING MAGNETIC INTERFERENCE FOR ELECTRONIC MAGNETOMETER SENSORS

摘要

Apparatus and methods to compensate hard iron and soft iron magnetic interference in magnetic sensing devices are described. Hard and soft iron interference may be modeled using an ellipsoidal surface generated by a plurality of magnetic field measurements. A displacement of the ellipsoid from a reference frame origin corresponds to hard iron or permanent magnetic field interference. A shape and orientation of the ellipsoid corresponds to soft iron magnetic field interference. The ellipsoidal surface may be analyzed to obtain magnetic field compensation values for cancelling hard iron and soft iron interference.

主权项

1. An electronic device configured to sense a magnetic field comprising:
a magnetometer configured to measure at least one value of an external magnetic field along at least one axis; and at least one processor configured to receive magnetic field data from the magnetometer and to calculate at least one parameter of an ellipsoid, wherein the magnetic field data is representative of the ellipsoid.