基于DOA的相干算法研究与应用
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摘要
波达方向估计(Direction of Arrival estimate)是一种阵列信号处理技术,这种技术普遍应用于雷达和移动通信系统中用来确定信号的到达方向.和其他方法相比,这种方法具有高的角度分辨能力.把DOA引入到地震数据的相干体算法中,通过频率域的聚焦,可以将频率域原本分散的相位聚焦到同一个频率上.对聚焦后的振幅和相位进行多项式拟合,可以得到反映振幅和相位空间变化的地震属性.这些属性具有明确的物理意义,可以应用这些属性识别小尺度断层,检测地质体的轮廓.对实际资料的计算结果表明本方法具有很大的应用前景.
Direction of arrival estimation is a technique of array signal processing,which is widely used in the radar and mobile communication systems to find the direction of the signal.Comparing with other methods,this method has high resolution in angular.Introducing this method into seismic data coherence algorithm,with the help of focusing in the frequency domain we can focus the phase on a given frequency.Polynomial fitting the focused amplitude and phase,we can obtain some attributes that reveal lateral amplitude and phase changes.These attributes have certain physical significance,and can be used to distinguish small faults and geologic features.Real data processing shows this method is effective.
Direction of arrival estimation is a technique of array signal processing,which is widely used in the radar and mobile communication systems to find the direction of the signal.Comparing with other methods,this method has high resolution in angular.Introducing this method into seismic data coherence algorithm,with the help of focusing in the frequency domain we can focus the phase on a given frequency.Polynomial fitting the focused amplitude and phase,we can obtain some attributes that reveal lateral amplitude and phase changes.These attributes have certain physical significance,and can be used to distinguish small faults and geologic features.Real data processing shows this method is effective.
引文
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[11] Jeffrey,David Swingler.Focused wide-band array processing by spatial resampling[J].1990,38(2) :359～360．
[12] Mahmoud Allam,Alireza Moghaddamjoo.Two-dimensional DFT projection for wide-band direction of arrival estimation[J].IEEE Transactions on Signal Processing,1995,43 (7) :1728～1732．
[13] 于红旗,刘剑,等.一种基于信号子空间聚焦的宽带DOA估计算法[J].系统工程与电子技术,2008,30(4) :609～612． Yu H Q,Liu J,et al.New wideband DOA estimation algorithm based on signal-subspace focusing method[J].Systems Engineering and Electronics,2008,30(4) :609～612．
[14] Ottilie F.Cools,Gerard C.Herman,et al.Fast computation of the 3-D Radon transform[J].Geophysics,1997,62 (1) :362～364．
[15] Kurt J.Marfurt R.Lynn Kirlin.3-D broad-band estimates of reflector dip and amplitude[J].Geophysics,2000,65 (1) :310～315．
[2] Kurt J.Marfurt,R.Lynn Kirlin,et al.3-D seismic attributes using a semblance-based coherency algorithm[J].Geophysics,1998,63(4) :1150～1165．
[3] Adam Gersztenkorn,Kurt J.Marfurt.Eigenstructure-based coherence computations as an aid to 3-D structural and stratigraphic mapping[J].Geophysics,1999,64(5) :1468～1479．
[4] KurtJ Marfurt,V.Sudhaker,et al.Coherency calculations in the presence of structuraldip[J].Geophysics,1999,64(1) :104～111．
[5] 张军华,王永刚,等.相干体技术算法改进及其在TJH地区的应用[J].物探与化探,2002,26(1) :50～52． Zhang J H,Wang Y G,et al.The improvement of the coherence cube technique and its application in the tjh area[J].Geophysical and Geochemical Exploration,2002,26 (1) :50～52．
[6] 宋维琪,刘江华.地震多矢量属性相干数据体计算及应用[J].物探与化探,2003,27(2) :128～130． Song W Q,Liu J H.The calculation and application of coherence data body of seismic multi-vector attributes[J].Geophysical and Geochemical Exploration,2003,27 (2) :128～130．
[7] Lu W K,Li Y D,Zhang S W,et al.Higher-order-statistics and superrace-based coherence-estimation algorithm[J].Geophysics,2005,70(3) :13～18．
[8] 张军华,董猛,等.基于GST的相干体方法研究及应用[J].天然气工业,2007,27(增刊A):381～383． Zhang J H,Dong M,et al.The research and application of coherency method based on the GST[J].Gas industry,2007,27(Suppl.):381～383．
[9] 段春节,吴汉宁,马承杰,等.基于高阶统计量的相干体算法在地震中深层构造解释中应用[J].地球物理学进展,2009,24(2) :640～643． Duan C J,Wu H N,Ma C J,et al.The Application of higher order statistics coherency algorithm in seismic data interpretation[J].Progress in Geophysics (in Chinese),2009,24(2) :640～643．
[10] 王从镔,龚洪林,许多年,等.高分辨率相干体分析技术及其应用[J].地球物理学进展,2008,23(5) :1575～1578． Wang C B,Gong H L,Xu D N,et al.High-resolution coherency analysis technique and its application[J].Progress in Geophysics (in Chinese),2008,23(5) :1575～1578．
[11] Jeffrey,David Swingler.Focused wide-band array processing by spatial resampling[J].1990,38(2) :359～360．
[12] Mahmoud Allam,Alireza Moghaddamjoo.Two-dimensional DFT projection for wide-band direction of arrival estimation[J].IEEE Transactions on Signal Processing,1995,43 (7) :1728～1732．
[13] 于红旗,刘剑,等.一种基于信号子空间聚焦的宽带DOA估计算法[J].系统工程与电子技术,2008,30(4) :609～612． Yu H Q,Liu J,et al.New wideband DOA estimation algorithm based on signal-subspace focusing method[J].Systems Engineering and Electronics,2008,30(4) :609～612．
[14] Ottilie F.Cools,Gerard C.Herman,et al.Fast computation of the 3-D Radon transform[J].Geophysics,1997,62 (1) :362～364．
[15] Kurt J.Marfurt R.Lynn Kirlin.3-D broad-band estimates of reflector dip and amplitude[J].Geophysics,2000,65 (1) :310～315．
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