A 3-axis magnetic inductive sensor array system used for localization and tracking of micro diagnosis capsule in human gastrointestinal tract is designed

error sources of this tacking system are analyzed

and the error correction methods are proposed to obtain better accuracy.The correction methods include background magnetic field elimination

sensitivity calibration

sensor position correction and sensor orthonormality adjustment.The experiment results show that the error correction procedure can improve the localization accuracy prominently.For the 8mm×8mm cylindrical N35 NdFeB magnet

the average position error is less than 8mm

and orientation error is less than 6°when the magnet is 150mm above the sensor array plane after the error correction procedure is implemented.The localization system can also track the locus of the capsule with a magnet inside

when it moves among the simulative intestinal tract.