兰州海拉尔核查地震台阵聚束波束配置方法研究
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摘要
地震台阵通过聚束处理可提高信号的信噪比,增强对弱信号的识别。聚束可看作时空带通滤波器,其通带由最小和最大波数定义,而波数是台阵几何结构的函数。论文讨论了兰州海拉尔核查地震台阵在禁核试北京国家数据中心的聚束波束配置方法,该方法考虑到台阵的几何结构、台阵波数分辨率、地震震相的慢度和频率分布,同时兼顾了系统的实时处理速度,并在禁核试北京国家数据中心数据处理系统中实际运行。
Beamforming can improve seismic array SNR and enhance the detection for weak signals.Beamforming can be seen as a spatiotemporal band-pass filter of which pass-band is defined by the minimum and maximum wavenumbers,which are functions of the geometry configuration of the array.The measure for beam deployment for HILR and LZDM Verification Seismic Array in Comprehensive Nuclear-Test-Ban Treaty Beijing NDC is researched in the paper.The measure is based on the geometry configuration of the array,the wavenumber resolution of the array,slowness and frequency distributions of seismic phases.At the same time,the real-time processing speed of system is also taken into account.The measure is operated in data processing systems of CTBT Beijing NDC.
Beamforming can improve seismic array SNR and enhance the detection for weak signals.Beamforming can be seen as a spatiotemporal band-pass filter of which pass-band is defined by the minimum and maximum wavenumbers,which are functions of the geometry configuration of the array.The measure for beam deployment for HILR and LZDM Verification Seismic Array in Comprehensive Nuclear-Test-Ban Treaty Beijing NDC is researched in the paper.The measure is based on the geometry configuration of the array,the wavenumber resolution of the array,slowness and frequency distributions of seismic phases.At the same time,the real-time processing speed of system is also taken into account.The measure is operated in data processing systems of CTBT Beijing NDC.
引文
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[2]Johnson,D.H.and Dudgeon,D.E..Array sig-nal processing,Prentice-Hall,Inc.,EnglewoodCliffs,NewJersey.1993.
[3]Wang,J,Israelsson,H.and Carter.Asystematicapproach to designing detectors for diverse seismicarrays[J].Seism.,Res.Let.1996,60(2):60.
[4]Wang.A Scheme for Initial Beam Deployment forInternational Monitoring System Arrays[J].Pureand Applied Geophysics,2002,159:1005-1020.
[2]Johnson,D.H.and Dudgeon,D.E..Array sig-nal processing,Prentice-Hall,Inc.,EnglewoodCliffs,NewJersey.1993.
[3]Wang,J,Israelsson,H.and Carter.Asystematicapproach to designing detectors for diverse seismicarrays[J].Seism.,Res.Let.1996,60(2):60.
[4]Wang.A Scheme for Initial Beam Deployment forInternational Monitoring System Arrays[J].Pureand Applied Geophysics,2002,159:1005-1020.
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