经验模态分解法提取地磁脉动

Picking up geomagnetic pulsation using empirical mode decomposition

选取磁通门磁力仪数据,利用经验模态分解法提取地磁脉动,并与传统小波分解法提取的地磁脉动方法作对比,分析子午链区域几个地磁台站提取的地磁脉动的纬度效应和经度效应。结果表明,经验模态分解法提取的地磁脉动形态清晰,易于辨识,与小波法相比,不用选择基函数,更适合于分析非稳态信号。

In this paper,the geomagnetic pulsation in selected GM4 original data is picked up using empirical mode decomposition method and compared with those getten from wavelet decom-position method.We also analyze the latitude effect and longitude effect of many geomagnetic stations in meridian chain region.The result shows that the shape of geomagnetic pulsation which picked up by empirical mode decomposition method is clear and very easy to recognize.In contrast to wavelet method,empirical mode decomposition method do not need to choose base function,much more suitable for analyze nonsteady signal.