地震信号的复调制细化方法的频谱分析
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摘要
为了得到地震信号某段频谱的精细结构,提高其频率分辨率,提出了频率细化技术.通过对地震信号进行复调制移频、数字低通滤波、重新采样、复FFT(Fast Fourier Transtorm)处理、频率调整实现对地震信号的复调制频率细化.利用Matlab,对实际地震信号进行分析,得到地震信号能量最大处的频率,实现了准确、快速的对地震信号某一窄带频谱的分析和研究.与FFT相比,复调制细化能够更好的得到幅度最大处的频率,使地震信号的频谱更精确.
In order to get a certain fine structure of seismic signal spectrum and improve the frequency resolution,the frequency refining technology is put forward.The ZFFT of the seismic signal is implemented by the ZFFT frequency shift,digital lowpass filter,resampling,complex FFT processing and frequency adjustment.Matlab is used to analyze the actual seismic signal to get the maximum frequency of the seismic signal energy,which relizes to analyze and study a certain narrowband spectrum of the seismic signal accurately and rapidly.Compared wiyh FFT,ZFFT is a more effective way to analyze local frequency structure of the seismic signal in terms of analysis accuracy.
In order to get a certain fine structure of seismic signal spectrum and improve the frequency resolution,the frequency refining technology is put forward.The ZFFT of the seismic signal is implemented by the ZFFT frequency shift,digital lowpass filter,resampling,complex FFT processing and frequency adjustment.Matlab is used to analyze the actual seismic signal to get the maximum frequency of the seismic signal energy,which relizes to analyze and study a certain narrowband spectrum of the seismic signal accurately and rapidly.Compared wiyh FFT,ZFFT is a more effective way to analyze local frequency structure of the seismic signal in terms of analysis accuracy.
引文
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[3]赵霞,熊小付,郭珂.用细化频谱技术分析断路器操动机构振动信号[J].电力系统自动化,2003,27(12):37.ZHAO Xia,XIONG Xiao-fu,GUO Ke.Application ofZoom Spectrum Analysis to Circuit Breaker OperatingMechanism Vibration[J].Automation of ElectricPower Systems,2003,27(12):37.(in Chinese)
[4]王兰炜,赵家骝,王子影等.频率细化技术在超低频/极低频电磁信号检测中的应用[J].地震学报,2007,29(1):59.WAN Lan-wei,ZHAO Jia-liu,WANG Zi-ying etal.Application of ZOOMFFT Technique to DetectingEM Signal of SLF/ELF[J].Seismologica Sinica,2007,29(1):59.(in Chinese)
[5]程佩青.数字信号处理教程[M].北京:清华大学出版社,2007.CHENG Pei-qing.Digital Signal Processing Tutorial[M].Beijing:Tsinghua University Press,2007.(in Chinese)
[6]梅海清,冯毅.数字变频FFT在频谱分析中的应用[J].石油化工自动化,2003(1):57.MEI Hai-qing,FENG Yi.Application of DigitalFrequency Conversion FFT in Spectrum Analysis[J].Automation In Petro-chemical Industry,2003(1):57.(in Chinese)
[7]于成波,陶红艳,杨菁,等.数字信号处理及Matlab实现[M].北京:清华大学出版社,2008.YU Cheng-bo,TAO Hong-yan,YANG Jing,et al.Digital Signal Processing and Matlab Implementation[M].Beijing:Tsinghua University Press,2007.(in Chinese)
[8]李建康,吕高贵,郑立辉.基于复杂度方法的地震波信号频谱特性分析[J].复杂系统与复杂性科学,2007,4(4):58.LI Jian-kang,LV Gao-gui,ZHENG Li-hui.TheSpectrum Character of Strong Ground Motion's SignalBased on Complexity Method[M].Complex Systermand Complexity Science,2007,4(4):58.(in Chinese)
[9]段生全,贺振华,黄德济.HHT方法及其在地震信号处理中的应用[J].成都理工大学学报:自然科学版,2005,32,(4):396.DUAN Sheng-quan,HE Zhen-hua,HUANG De-ji.Application of the Hilbert Huang Transform to theAnalysis of Seismic Signal[J].Journal of ChengduUniversity of Technology:Science&TechnologyEdition,2005,32,(4):396.(in Chinese)
[10]陈飞,赵永,刘阳.多尺度分解在地震信号处理中的应用[J].中国地震,2004,20(4):405.CHEN Fei,ZHAO Yong,LIU Yang.Application ofWavelet on Seismic Signal Processing[J].EarthquakeResearch In China,2004,20(4):405.(in Chinese)
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