【作者】 范国华； 姚同起； 韩克礼；

【Author】 Fan Guohua, Yao Tongqi and Han Keli(Institute of Geophysics, China Seismological Bureau, Beijing 100081, China)

【机构】 中国地震局地球物理研究所；

【摘要】 鉴于地磁不规则脉动变化强烈的非平稳型,信号序列的频谱分析中广泛地应用的富氏变换方法不能很好的反映地磁不规则脉动变化所包含的频谱成分,更不能反映包含于非平稳性中的频谱成分随时间的变化。本文引用子波变换方法对几个地磁不规则脉动变化P,2的频谱成分及其随时间的变化进行了分析,得到了较好的结果。这有助于我们更好地认识地磁不规则脉动变化。更多还原

【Abstract】 The fourier transform method which is extensively used in spectral analysis of signal series can not reflect the spectral components contained in geomagnetic irregular pulsations well and can not reflect the changes of the spectral components with time because the geomagnetic irregular pulsations are of strong instability. In this paper, we apply wavelet transform method to several P,2 geomagnetic irregular pulsations for analysing their spectral components and the changes of them with time. The results are not bad and it is helpful for us to know the geomagnetic irrgular pulsations better.更多还原