摘要
EH-4连续电导率成像系统是新一代数字化的电磁法仪器。针对EH-4系统有限时长的离散傅立叶变换引起的谱泄露问题,研究了EH-4信号在傅立叶变换中不同尺度窗口下的频谱特点,不同尺度窗口对EH-4信号分析的作用和影响。研究表明,不同尺度窗口表现了信号的不同方面的特点,各自具有一定的优缺点,应根据信号和勘测目的,在不同尺度窗口下观察波形才有利于更全面、准确地解读信号。
Continuous conductivity imaging system of EH-4 is the update numeral instrument with electromagnetic method. With regard to the spectral leak problem of EH-4 system caused by Fourier transform of limited time and discrete sampling, the frequency spectrum characteristics of EH-4 signals in Fourier transform under the different windows and their influence on signal analysis are discussed. Different windows indicate the characteristics of the different sides of signal, and have the different merits and defects respectively. Analysis and interpretation of EH-4 signals done in different windows will be complete and authentic.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2005年第2期193-197,共5页
Chinese Journal of Geotechnical Engineering
基金
中国博士后科学基金资助项目(2004036156)
关键词
岩土工程勘测
EH—4系统
信号处理
频谱分析
exploration of geotechnical engineering
EH-4 system
signal processing
frequency spectral analysis
