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• W2380488752 abstract "Converted-wave Kirchhoff prestack time migration(C-wave KPSTM)is an important technique in Converted-wave processing because it can image accurately in the whole 3D spaceswithout CCP and DMO.As the calculation method of migration is inappropriate,it leads to appearing of operator aliasing.The imaging quality is reduced because of operator aliasing in the C-wave PSTM.To eliminate the imaging effect of operator aliasing,the different from the previous is thatpaperanalyzed how it comes into being in P-wave avoiding the complex formula and the C-wave parameters,and the essence of operator aliasing is that the sampling not meeting the nyquist sampling theorem.The channel space is not dense enough in adjacent data channel,therefore,the remaining difference of migration operator cannot meet the nyquist sampling theorem,and the operator aliasing appeared.In order to meet the nyquist sampling theorem it have to do data interpolation,but the calculation will be huge and unacceptable.Through the analyzing the operator aliasing data,it get a conclusion that the input data processing with operator aliasing filter firstly and then migrating and summingis equivalent to the input data being interpolated and then migrating and summing.In this way the calculation is not increased and need operator aliasing filter only.It starts from the basic formula of operator aliasing of P-wave,and derived by the mathematical formula of C-wave PSTM,and gets the mathematical expression of the operator aliasing in C-wave PSTM.It is clear that it can get maximum frequency of operator aliasing in a time point,when the frequency of input data is lower than the maximum frequency,it can filter the part of aliasing,now the problem turn into a problem of low pass filtering.To design the low pass filter,It designs the complex filter base on Z-transform and nyquist sampling theoremin the algorithm,and built the locally triangle low pass filter for operator aliasing filtering.In the process of implement,The innovation of the paper is thatit completes the parallel algorithm of locally triangle filtering based on CUDA.The algorithm is realized with a Quadro FX 5800 GPU,because of the highperformance of GPU,the algorithm gets the nearly 30 xspeed up running on GPU than one CPU core.It verifythe operator aliasing algorithm by construct a pulse model,the algorithm can eliminate the noise of operator aliasing better.In the end,passing through the C-wave work data test,it shows the validity and the instantaneity of eliminate the operator aliasing." @default.
• W2380488752 created "2016-06-24" @default.
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• W2380488752 date "2014-01-01" @default.
• W2380488752 modified "2023-09-26" @default.
• W2380488752 title "Anti-aliasing method of converted-wave Kirchhoff prestack time migration base on CUDA" @default.
• W2380488752 hasPublicationYear "2014" @default.
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