摘要
小波分析是具有时频多分辨率分析特点的新的信号处理方法,本文应用时间序列反映出大地电磁信号功率谱特性并比较了几种常规实验手段的分析效果,通过小波变换分离出假频所在通道并进行初步除噪,按能量强弱对信号重新截断划分.本文的目的就是尽可能的消除对各组信号不一致的影响因素(局部噪声),提取共性较强的部分并按能量的差异来划分这些信号.
This paper gives out the power spectral character of the Earth Signals by Time series analysis, compared ome conventional measures'effects in this field.Meanwhile, wavelets transformation is applied to separate the wrong channel whose frequencies have been contaminated by noises.Lastly, we will desigh some special programs to filter the noises out, cut signals into some short segments,and classify them again according to their energy power.
出处
《地球物理学进展》
CSCD
2004年第2期431-436,共6页
Progress in Geophysics
关键词
时间序列
功率谱
小波
假频
time series,power spectral character,wavlets transformation,wrong channel
