双谱估计在地震前兆数字化资料分析中的应用
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摘要
仿真信号的试验结果表明,基于双谱的时延估计方法对高斯噪声具有屏蔽能力,能更好地压制噪声,并准确估计信号的时间延迟;基于双谱功率谱重构要比直接用FFT变换方法估计功率谱具有更高的精度和性能;初步研究结果表明,对于正常背景下的前兆观测记录基于双谱的特征参数分布具有较好的一致性,在异常背景下则表现出明显的离散性,显现出双谱估计具有良好的异常信息识别能力。
The test results for emulative signal indicate that the time delay estimation method of bispectrum has the capacity to suppress Gauss noise and can accurately estimate the time delay of signals.Compared with Fourier transform method,the spectrum power reconstruction method of bispectrum has higher accuracy and capability.The research results show that the characteristic parameter distribution of bispectrum has a good consistent characteristics to the normal earthquake precursory monitoring data,but has a obvious dispersion characteristics to the abnormal data,which indicats that bispectrum has the discrimination capability to earthquake precursory anomalies in monitoring data.
The test results for emulative signal indicate that the time delay estimation method of bispectrum has the capacity to suppress Gauss noise and can accurately estimate the time delay of signals.Compared with Fourier transform method,the spectrum power reconstruction method of bispectrum has higher accuracy and capability.The research results show that the characteristic parameter distribution of bispectrum has a good consistent characteristics to the normal earthquake precursory monitoring data,but has a obvious dispersion characteristics to the abnormal data,which indicats that bispectrum has the discrimination capability to earthquake precursory anomalies in monitoring data.
引文
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[24]Choi H I,Williams W J.Improved time-frequency representa-tion of multicomponent signals using exponential kernels[J].IEEE Trans on Acoust.Speech Signal Processing,1989,37:862-871.
[2]Mendel M.Tutorial on higher-order Statistics(spectra)inSignal Processing and System Theory:Theory Results andSome Applications[J].Proc.IEEE,1991,79:278-305.
[3]Hatzinakos D,Nikias L C.Blind equalization using a trispec-trum based algorithm[J].IEEE Trans.Comm.,1992,39:669-682.
[4]Lazear G D.Mixed-phase wavelet estimation using fourth-order cumulates[J].Geophysics,1993,58:1042-1051.
[5]Velis D R,Ulrych T J.Simulated annealing wavelet estima-tion via fourth-order cumulate matching[J].Geophysics,1996,61:1939-1948.
[6]Parker J B,Ware H A,Wipf D P,et al..Fault diagnostics u-sing statistical change detection in the bispectral domain[J].Mechanical Systems and Signal Processing,2000,14(4):561-570.
[7]Dusan K,Radoslav S.Order bispectrum:a new tool for recip-rocated machine condition monitoring[J].Mechanical Systemsand Signal Processing,2000,14(6):871-890.
[8]贾继德,刘志刚,张平,等.基于阶比双谱分析的发动机故障特征提取[J].内燃机学报,2004,22(5):462-469.
[9]陆根源,陈孝桢.信号检测与参数估计[M],北京:科学出版社,2004:1-78.
[10]吴益明,卢京潮,连玮,等.基于双谱相位算法的无人机图像定位研究[J].飞行器测控学报,2006,25(3):20-24.
[11]王凯,张永详,李军.齿轮裂纹故障的双谱分析[J].机械强度,2006,28(3):346-348.
[12]Gannakis G,Cumulants B.A helpful tool in signal processing[J].Proc.IEEE,1987,75:1333-1334.
[13]Nikias L C,Raghuveer M R.Bispectrum estimation:A digit-al signal processing framework[J].Proc.IEEE,1987,75(7):869-891.
[14]尹成,伍志明,邓怀群.高阶统计量方法在地震勘探中的应用[J].地球物理学进展,2003,18(3):546-550.
[15]王书明,王家映.高阶统计量在大地电磁测深数据处理中的应用研究[J].地球物理学报,2004,47(5):928-934.
[16]熊晓军,尹成,张白林,等.高阶统计量油气检测方法研究[J].地球物理学报,2004,47(5):920-927.
[17]杨新峰,杨迎春,苑秉成.强噪声背景下微弱信号检测方法研究[J].航船电子工程,2005,25(6):123-125.
[18]Giannakis G B,Mendel J M.Cumulate-based Order deter-mination of non-Gaussian ARMA Model[J].IEEE Trans Acoast Speech Signal Processing,1990,38:1411-1423.
[19]余厚全.利用双谱谱提取固井模式特征信息[J].测井技术,2001,24(6):410-414.
[20]蒋忠进,林君,陈祖斌.双谱在可控震源地震信号预处理中对时延估计的应用[J].探测与控制学报,2003,25(2):58-61.
[21]蒋忠进,林君,陈祖斌.三阶累积量在可控震源地震时间剖面中压制旁瓣的应用[J].地学前缘,2003,10(1):151-154.
[22]张浩,赵正予,谢树果,等.地磁脉动信号的双谱分析[J].武汉大学学报(理学版),2001,47(3):351-354.
[23]马志峰,李金波.山东苍山5.2级地震前十里泉电厂水汞异常特征[J].山西地震,1999,(1):44-45.
[24]Choi H I,Williams W J.Improved time-frequency representa-tion of multicomponent signals using exponential kernels[J].IEEE Trans on Acoust.Speech Signal Processing,1989,37:862-871.
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