摘要
大地电磁测深法(MT)野外观测得到的原始资料是包含多种频谱的时间序列,这种时间序列中常包含不需要的信息和50 Hz及其谐波的干扰。结合FIR数字滤波技术与MT时间序列的特征,提出了一种基于FIR数字滤波技术的MT时间序列去噪方法,讨论了FIR数字滤波器的原理和实现,分析了理论数据通过FIR数字滤波的带通和陷波处理,探讨了对实测时间序列的带通和陷波所取得的效果。
The time series in Magnetotellurics （MT）contains multiple spectra and often has unneeded natural electromagnetic signals and the interference of 50 Hz and its harmonic frequency. In this paper, combining FIR digital filter technology and features of MT time series, the authors put forward a method for removing the noises in MT. The principles and designs of FIR DF are discussed, the processes which include band-passing and trapping noises of theoretical data through the FIR DF are analyzed, and the effectiveness of actual data through FIR band-pass filter and FIR trap filter is also investigated.
出处
《物探与化探》
CAS
CSCD
2007年第B10期24-28,共5页
Geophysical and Geochemical Exploration
基金
国土资源部百名优秀青年科技人才计划项目
中国地质调查局科技项目(1212010660301)资助
