HHT方法在受城市轨道交通干扰地电场观测数据中的应用

摘要

The function of the empirical mode decomposition and margin spectrum of the Hilbert-Huang Transform (HHT) is applied to the analysis of geoelectric data observed by the Xiji station, Tongzhou district of Beijing. The recorded data is remarkably disturbed by the Beijing subway, making the data utilization rate very low. The effects of the subway on the data has been analyzed.The result shows that, when the recording track goes parallel to the subway line, the recorded data would be most severely affected. Making use of the function of empirical mode decomposition of HHT can eliminate most subway disturbance and reduce its influence to the least. In addition, the analyzed result of margin spectrum indicates that the energy of the subway disturbance is lower than that of normally observed geo-electric field.%较为详细地介绍了希尔伯特-黄变换方法,并将该方法中的经验模态分解功能和边际谱功能应用于受城市轨道交通干扰较大的北京市通州区西集镇地电场台站的观测资料中,对城市轨道交通在地电场观测中的影响进行了分析研究.结果表明,在地电场观测台站受到轨道交通干扰时,布极方位与轨道方向一致的测道所记录的数据受到的影响最大;利用经验模态分解功能能够将地铁的干扰基本剔除,使其影响降低到最小程度.此外,边际谱分析表明,该台站受地铁干扰的能量较正常观测地电场能量要小.