A Preliminary Study on Fast Calibration Method for Magnetic Positioning Sensor Array

Magnetic positioning method can be well used for tracking of intra-body objects, such as wireless capsule robot. Before the magnetic sensor array can be used to locate the target, it is necessary to calibrate each sensor to ensure tracking accuracy. Existing calibration methods generally require a large number of samples with prior known pose information of the magnetic target, and then the calibrated coefficients can be obtained by optimization method. Aiming to simplify the calibration process, we propose a fast calibration method in which position and direction of magnetic target are not required during the calibration by introducing a novel calibration tool and corresponding algorithm. As a result, the calibration process can be simple and no advanced pose information is needed. Experimental results verified the proposed method.