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有限差分波动方程偏移
相关语句
  finite difference method wave equation migration
     Forward simulation of ground penetrating radar and its finite difference method wave equation migration processing
     探地雷达的正演模拟及有限差分波动方程偏移处理
短句来源
  “有限差分波动方程偏移”译为未确定词的双语例句
     Based on wave theory, 15-degree finite difference migration wave equation is induced in drift coordinate system, and the solution of the equation is discussed.
     以波动方程为基础,在浮动坐标系下建立了有限差分波动方程偏移15°方程,并探讨了方程的解法;
短句来源
     By means of the analysis method of the spatial frequency of the wave field,we have studied the cause which leads to the dispersion phenomenon in finite difference migration.
     本文指出,这种假定的合理性需要进一步讨论. 我们用波场的空间频率分析方法,首次证明了:在不考虑差分格式本身固有的色散效应的情况下,与陡倾角相关的有限差分波动方程偏移的频散问题,是偏移处理中使用近似波动方程,使被偏移数据体波场的空间频率畸变所致.
短句来源
     Consequently,the limitation to the structure dip in finite differenece migration can be considered to be the limitation to the spatial frequency of the wave field corresponding to the field data.
     在此基础之上,本文提出了压缩空间频率的分级偏移方法. 这种方法对于被处理数据的几何特性无需作任何假定,完全以波动理论解释了分级偏移可以减少有限差分波动方程偏移对于倾角的限制,从而在理论上对分级偏移方法作了进一步的完善和补充.
短句来源
     Being directed against this problem, a method of the wave equation migration with finite difference to eliminate the diffraction waves in GPR data is derived in this paper. Based on the model testing and analyzing, the good results of processing and analyzing are achieved for a field GPR data using the method.
     针对这一问题 ,作者提出了探地雷达有限差分波动方程偏移法 ,首先进行了理论模型的实验分析 ,在此基础上我们对实测 GPR剖面资料进行分析处理 ,取得了较好的成果。
短句来源
  相似匹配句对
     ALL DIP FINITE-DIFFERENCE MIGRATION WITH SCALAR WAVE EQUATION
     标量波动方程全倾角有限差分偏移
短句来源
     FORWARD MODELING AND MIGRATION BY FOURTHORDER FINITE DIFFERENCE METHOD
     四阶有限差分波动方程模拟和偏移
短句来源
     The finite element-difference method of 3-D wave equation migration
     三维波动方程有限元-差分偏移
短句来源
     PRESTACK DEPTH MIGRATION BY WAVE EQUATION FINITE DIFFERENCE
     波动方程有限差分法叠前深度偏移
短句来源
     The Wave Equation Migration of Ground Penetrating Radar by the Method of Finite Difference
     有限差分法探地雷达波动方程偏移
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This paper,having discussed K. Larner's Cascade migration method in detail,points out that the assumption which considers the partially migrated data as new stack data is worth while further discussing. By means of the analysis method of the spatial frequency of the wave field,we have studied the cause which leads to the dispersion phenomenon in finite difference migration. In terms of the distortion of the spatial frequency of the data being migrated ,we explain how the dispersion phenomenon related to the...

This paper,having discussed K. Larner's Cascade migration method in detail,points out that the assumption which considers the partially migrated data as new stack data is worth while further discussing. By means of the analysis method of the spatial frequency of the wave field,we have studied the cause which leads to the dispersion phenomenon in finite difference migration. In terms of the distortion of the spatial frequency of the data being migrated ,we explain how the dispersion phenomenon related to the structure dip rises. Consequently,the limitation to the structure dip in finite differenece migration can be considered to be the limitation to the spatial frequency of the wave field corresponding to the field data. The spatial frequency of the wave field can be changed through a linear trasform of the coordinate.

分级偏移(Cassade migration)可以减小有限差分波动方程偏移对于倾角的限制,提高有限差分波动方程偏移的精度.K.拉纳(K.Larner)等人首先对此作出了证明.但是,拉纳的证明必须假定每一次偏移处理的输入剖面都是正入射的几何图象.本文指出,这种假定的合理性需要进一步讨论.我们用波场的空间频率分析方法,首次证明了:在不考虑差分格式本身固有的色散效应的情况下,与陡倾角相关的有限差分波动方程偏移的频散问题,是偏移处理中使用近似波动方程,使被偏移数据体波场的空间频率畸变所致.有限差分波动偏移对于倾角的限制可以归结为是对数据体波场空间频率的限制.在室内对野外资料进行处理时,人为地加大地震道间距的数值可以压缩数据体波场的空间频率.在此基础之上,本文提出了压缩空间频率的分级偏移方法.这种方法对于被处理数据的几何特性无需作任何假定,完全以波动理论解释了分级偏移可以减少有限差分波动方程偏移对于倾角的限制,从而在理论上对分级偏移方法作了进一步的完善和补充.本方法已在国产TQ—6计算机系统上投入实际生产使用,效果是令人满意的.

Cut-error that made from the finite difference mirgation,phase angle of error transfer function and factors that determine their values are discussed.Three functions of the different sense of the real wavefield are put forward and analysed respectively.We can see the value of the step of time is the dominant factor of cut-error,on the contrary,the steps of z and x are secondary.Changeable step mirgation is advanced.The aberration of phase depends on cut-error, and the phase angle of error transfer function...

Cut-error that made from the finite difference mirgation,phase angle of error transfer function and factors that determine their values are discussed.Three functions of the different sense of the real wavefield are put forward and analysed respectively.We can see the value of the step of time is the dominant factor of cut-error,on the contrary,the steps of z and x are secondary.Changeable step mirgation is advanced.The aberration of phase depends on cut-error, and the phase angle of error transfer function is talked over.At last ,the reasonable values of t,z and x are gained by the efficiency function.

讨论截断误差与误差传递因子相角的影响与决定因素 ,以寻求有限差分波动偏移的合理采样步长。用三种波场函数来模拟实际波场进行理论计算。结果表明 :时间采样步长Δt是截断误差的主导因素 ,空间采样步长Δx(横向 )和Δz(深度方向 ) ,尤其是Δx影响甚小。依据空间点变化时截断误差的变化规律 ,提出了变步长偏移法。分析误差传递因子相角等因素对有限差分波动方程偏移造成的相位畸变问题 ,找到相应规律。综合考虑截断误差及误差传递因子相角 ,给出了合理采样步长。

Due to the interference of diffraction waves, the processing and interpretation of Ground Penetrating radar(GPR) data will become difficult and the precision and reality of their results will be also reduced. Being directed against this problem, a method of the wave equation migration with finite difference to eliminate the diffraction waves in GPR data is derived in this paper. Based on the model testing and analyzing, the good results of processing and analyzing are achieved for a field GPR data using the...

Due to the interference of diffraction waves, the processing and interpretation of Ground Penetrating radar(GPR) data will become difficult and the precision and reality of their results will be also reduced. Being directed against this problem, a method of the wave equation migration with finite difference to eliminate the diffraction waves in GPR data is derived in this paper. Based on the model testing and analyzing, the good results of processing and analyzing are achieved for a field GPR data using the method.

在探地雷达 (Ground- Penetrating Radar,简称 GPR)剖面中 ,由于绕射波的存在 ,使得资料的处理解释十分困难 ,其结果的准确性与真实度也会降低。针对这一问题 ,作者提出了探地雷达有限差分波动方程偏移法 ,首先进行了理论模型的实验分析 ,在此基础上我们对实测 GPR剖面资料进行分析处理 ,取得了较好的成果。

 
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