DETECTING ERRORS IN THE DETERMINATION OF MAGNETIC LOCATION OR ORIENTATION

摘要

A process detects distortions to magnetic location or orientation determinations. The process includes measuring a plurality of magnetic field values, determining one of a probe's lo-cation (12) and a probe's orientation from an extremum of an opti-mization function. The measured values depend on the probe's lo-cation (12) and orientation. The optimization function depends on the measured field values and field values calculated from a model. The process also includes indicating that a distortion to the deter-mining exists in response to the extremum belonging to a prese-lected range.