Abstract
Since the magnetic field is not attenuated or shielded by organic matter, magnetic field positioning is suitable for positioning in vivo. However, since the magnetic field has a larger distance attenuation than when radio waves or sound waves are used, it is difficult to determine the position and direction of the magnet using the inverse analysis method for the measured value of the magnetic field. Inverse analysis requires solving nonlinear equations by iterative calculation．It is important to develop an algorithm that converges with a small number of iterations and a method for setting initial values. We report a solution to the position tracking for a magnet moving in a living body or the field outside the body.
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