基于多重互相关函数计算地探信号到时差
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摘要
论文介绍了一种提高地震等地探信号到时差精度的新方法-多重互相关函数法.从理论上推导出了多重互相关函数的公式,且通过实验验证了用此函数不仅能提高信号的信噪比,还能提取出相似信号所共有的频率信号,进而精确地识别出它们的到时差.探讨了此原理在场地、地震剪切波速信号到时差提取中的应用,分析结果显示:相比互相关函数,多重互相关函数能更准确地求取两相似信号的初至时刻差.
A new method for detection of wave arrival time difference of earthquakes and other earth signals based on multiple cross-correlation function is introduced in this paper.The formula of the multiple cross-correlation function is derived and using this function not only can improve the SNR of shear-wave signals but also can extract common frequency components of two similar signals,which is certificated through experiments.Furthermore,difference of their arrival times can be detected accurately.This principle can be used to deal signals such as earthquake shearwave. Analysis results show that compared with cross-correlation,multiple cross-correlation function can be used to detect waves arrival time difference more accurately.
A new method for detection of wave arrival time difference of earthquakes and other earth signals based on multiple cross-correlation function is introduced in this paper.The formula of the multiple cross-correlation function is derived and using this function not only can improve the SNR of shear-wave signals but also can extract common frequency components of two similar signals,which is certificated through experiments.Furthermore,difference of their arrival times can be detected accurately.This principle can be used to deal signals such as earthquake shearwave. Analysis results show that compared with cross-correlation,multiple cross-correlation function can be used to detect waves arrival time difference more accurately.
引文
[1] 赵爱华,丁志峰.复杂介质地震定位中震源轨迹的计算[J].地球物理学报,2008,51(4) :1188～1195． Zhao A H, Ding Z F. Calculation of focal loci for earthquake location in complex media[J]. Chinese J. Geophys. (in Chinese) 2008,51(4) :1188～1195．
[2] 徐平,王宝善.利用互相关函数求地震波衰减[J].地球物理学报,2006,49(6) :1738～1744． Xu P, Wang BS. Estimating seismic attenuation Using crosscorrelation function[J]. Chinese J. Geophys. ( in Chinese),2006,49(6) :1738～1744．
[3] 罗桂纯,王宝善.气枪震源在地球深部结构探测中的应用研究 进展[J].地球物理学进展,2006,21(2) :400～407． Luo GC, Wang BS. Progress in earth's deep structures exploration by airgun source[J]. Progress in Geophys. (in Chinese) ,2006,21(2) :400～407．
[4] GB/T50269～97． 地基动力特性测试规范[S]. GB/T50269～97． The test norm of Foundation driving force characteristic property[S].
[5] GB5001G～2001． 建筑抗震设计规范[S]. GB5001G～2001． The norm of Build the aseismatic design[S].
[6] 林宗元.岩土工程试验监测手册[M].沈阳:辽宁科学出版社,1994． Lin Z Y. The rock soil project experiment monitors handbook[M]. Shenyan: Lianlin Science Press, 1994．
[7] 侯兴民,薄景山,杨学山,等.互相关函数在单孔法剪切波速测量中的应用[J].地震工程与工程振动,2004,24(2) :60～65． He X M, Bo J S, Yang X S, et al. Applications of correlation function in shear-velocity measurement of single-hole method[J]. Earthquake project and the project vibrates,2004,24(2) : 60～65．
[8] 陈英杰.瑞利波法在工程抗震中的应用[J].世界地震工程,2005,21(1) :97～101． Chen Y J. Applications of Reyleigh method in earthquakeengneering[J]. World earthquake project, 2005,21 (1) : 97 ～101．
[9] 杨学山,杨巧玉.速度型拾振器低频特性扩展技术研究[J].地球物理学进展,2004,22(4) :759～763． Yang X S, Yang Q Y. Research into the extension techniques for the capacity of vibrating velocity sensors in low-frequency band. Progress in Geophysics,2004,22(4) :759～763．
[2] 徐平,王宝善.利用互相关函数求地震波衰减[J].地球物理学报,2006,49(6) :1738～1744． Xu P, Wang BS. Estimating seismic attenuation Using crosscorrelation function[J]. Chinese J. Geophys. ( in Chinese),2006,49(6) :1738～1744．
[3] 罗桂纯,王宝善.气枪震源在地球深部结构探测中的应用研究 进展[J].地球物理学进展,2006,21(2) :400～407． Luo GC, Wang BS. Progress in earth's deep structures exploration by airgun source[J]. Progress in Geophys. (in Chinese) ,2006,21(2) :400～407．
[4] GB/T50269～97． 地基动力特性测试规范[S]. GB/T50269～97． The test norm of Foundation driving force characteristic property[S].
[5] GB5001G～2001． 建筑抗震设计规范[S]. GB5001G～2001． The norm of Build the aseismatic design[S].
[6] 林宗元.岩土工程试验监测手册[M].沈阳:辽宁科学出版社,1994． Lin Z Y. The rock soil project experiment monitors handbook[M]. Shenyan: Lianlin Science Press, 1994．
[7] 侯兴民,薄景山,杨学山,等.互相关函数在单孔法剪切波速测量中的应用[J].地震工程与工程振动,2004,24(2) :60～65． He X M, Bo J S, Yang X S, et al. Applications of correlation function in shear-velocity measurement of single-hole method[J]. Earthquake project and the project vibrates,2004,24(2) : 60～65．
[8] 陈英杰.瑞利波法在工程抗震中的应用[J].世界地震工程,2005,21(1) :97～101． Chen Y J. Applications of Reyleigh method in earthquakeengneering[J]. World earthquake project, 2005,21 (1) : 97 ～101．
[9] 杨学山,杨巧玉.速度型拾振器低频特性扩展技术研究[J].地球物理学进展,2004,22(4) :759～763． Yang X S, Yang Q Y. Research into the extension techniques for the capacity of vibrating velocity sensors in low-frequency band. Progress in Geophysics,2004,22(4) :759～763．
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