Abstract
The local geomagnetic chart is an effective tool to describe the geomagnetic information in the region accurately and visually which is a reference in application for future. Precision of local geomagnetic chart directly affects its value. When the movable magnetic objects are in the region, the distribution of geomagnetic field will be changed. When the movable magnetic objects are out the region, the distribution of geomagnetic field will recover to normal situation. Thus, magnetic objects can bring the error to some measured data. As an result, precision of the geomagnetic chart will reduce. On the basis of analysis of the existing geomagnetic model, the method to eliminate the movable geomagnetic anomaly in drawing the chart is proposed which is based on Taylor polynomial model. In this method, affected regions by magnetic object are gotten, the geomagnetic model are built in these affected region by precise data, the measured data in these region is replayed with model data, finally, the geomagnetic chart is draw by combined data using Kriging interpolation algorithm. The experiment results show that the method can improve the precision of the local magnetic chart when the movable magnetic objects exist in the measurement region.
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