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基于红山地磁台磁通门磁力仪GM4-2记录的日变化数据,提出了一种减小仪器定向误差的方法,即D要素磁轴零场漂移S0校正法.首先基于零场漂移S0测量原理,试制测量工具无磁旋转平台,并对磁力仪GM4-2零场漂移S0值进行测量,得出该值约为1 024.7nT;然后在重新定向时对该数值进行误差校正;最后将较正后的零场漂移S0值应用到理论日变化数据和定向后的实际日变化数据中.结果表明,D要素磁轴零场漂移S0是产生定向误差的主要因素,经过零场漂移S0校正后的日变化数据与理论日变化数据一致,消除了由定向误差所造成的日变化畸变,从而能更真实地反映地磁场变化.
Based on the diurnal variation data recorded by Hongshan Meteorological Station fluxgate magnetometer GM4-2, a method of reducing the misorientation of the instrument is proposed, which is the zero-field drift S0 correction method of D-element magnetic axis.Firstly, Principle, the non-magnetic rotating platform of the trial measurement tool, and measured the zero drift S0 value of the magnetometer GM4-2, which is about 1 024.7nT; then the value is corrected for error when it is reoriented; finally, The zero drift S0 after positive field is applied to the theoretical diurnal variation data and the actual daily diurnal variation data after the orientation.The results show that the zero field drift S0 of the D element magnetic axis is the main factor of orientation error and after zero offset S0 correction The daily variation data are consistent with the theoretical daily variation data, eliminating the diurnal variations caused by the directional errors, which can more truly reflect the changes of the geomagnetic field.