SENSING OF A MAGNETIC TARGET

摘要

An apparatus (110) comprises a magnetic target (120) for generating a magnetic field that is uniform and concentric about a central axis of the target (120); an array (130) of three-axis digital magnetic compasses for sensing the magnetic field; and a processor (140) for finding intersection points of vectors from the compasses (210) to the target (120). The vectors lie in a global X-Y plane that is normal to the central axis. Each vector indicates a direction of sensed magnetic field from one of the compasses (210) to the magnetic target (120).