兰州地磁台GM3磁力仪基线值变化特征和处理方法探讨

根据兰州地磁台2002年GM3磁通门磁力仪观测基线值数据，分析了基线值的变化规律和影响因素，并把影响因素定量掺入到对基线的平滑过程中，将得到的结果与FHD-1仪观测数据的处理结果做比较，得出基线值主要受温度系数和漂移影响。在对基线值进行平滑时定量考虑温度系数对基线值的影响程度，是提高地磁最终观测结果精确度可行且有效的方法。

Discussion on the Varying Characteristics and Processing Method of the Baseline Value Observed by GM3 Magnetometer at Lanzhou Geomagnetic Station

On the basis of the 2002 baseline value records produced by the GM3 magnetometer at Lanzhou geomagnetic station, we analyzed the varying rule of the baseline value and the effect factors on it, and removed the effect factors by adding effect coefficient of temperature into the process of smoothing baseline. Compared with the result from FHD-1 proton magnetometer, it is found that the baseline value is influenced mainly by temperature and drift. So, the best way to enhancing data quality is to remove temperature disturbance in data processing.