【摘要】 采用改进的EMD阈值进行分解,将地磁数据进行阈值滤波后重整;做频率域分析,认为EMD阈值滤波可以有效去除高频干扰,尽可能保留低频信息。对磁静日和磁扰日数据进行EMD消噪,做时频分析,在HHT谱和边际谱清晰呈现地磁信号的动态变化特征及对应的能量变化。更多还原

【Abstract】 Using the modified EMD threshold method, geomagnetic data is de-noised by threshold method and then reconstructed. By analysis in frequency domain, EMD threshold method is more effective in de-noise high frequency interference from the low frequency information. After denoising by EMD method, we make time frequency analysis to the data of magnetically quiet day and disturbed day. And the result of HHT spectrum and marginal spectrum displayed the change of dynamic frequency characteristics of geomagnetic data and the change of energy clearly.更多还原