Aiming at the problem that geomagnetic sensor is susceptible to interference,a pre-processing total least square iteration method is proposed for calibration compensation. Error model for geomagnetic sensor is analyzed and the correction model is proposed,characteristics of model are analyzed and converted into estimation problem of nine parameters. The geomagnetic data is filtering processed by Hilbert Huang transform( HHT) to improve signal-to-noise ratio,and the nine parameters are calculated by using th...