频率波数域 meaning in English
frequency-wavenumber domain
Examples
- Comprehensively discuss the issues in application , adaptive condition and performance , propose a fast arithmetic of forward modeling and depth migration in common shot gathers with one - way acoustic wave equation based on vrselrf , and verify the arithmetic by numerical simulation . concisely discuss the cause of the creation of evanescence and the problem of lateral amplitude discontinuity result from it . fourthly , use the reflectivity model , computed to describe the fracture model , with the formula of computation reflectivity based on elastic - acoustic approximation , and the wavelet model computed by the method , wavelet creation with fourier transform , we proposed , in conjunction with vrselrf wavefield extrapolation operator
第三，将频率波数域稳定的变参考慢度rytov近似广义屏波场延拓算子( vrselrf )应用于叠前与叠后正演模拟、叠前与叠后深度偏移，对算法应用中应注意的问题、适用范围、性能等作了较为全面的论述；提出了基于vrselrf的单程声波方程共炮记录正演模拟和深度偏移快速算法，并通过数值模拟试验对算法进行了验证；简要地讨论了倏逝波的产生原因及其带来的横向振幅不连续性问题。 - This conversion is based on the analytic expression of sonic and elastic wave equation , and use the different wave field extrapolation , which is initially used in seismic migration and forward modeling . this paper introduces the easy and efficient finite - difference method to realize the conversion by comparing three different methods
论文经过对三种常规波场延拓方法( kirchhoff积分法、频率波数域法和有限差分法)优缺点的比较，采用了简单易用的有限差分方法来实现这种转换。 - Author , starts from the one - way wave equation of wavefield extrapolation , research the relationship and transform condition of wavefield extrapolation operators , and propose the steady variational reference slowness rytov approximation general screen wavefield extrapolation operator ( vrselrf ) which can adapt severe lateral velocity variations , in frequency - wavenumber domain , and the improved wavefield extrapolation scheme , also give the method to improve the computation efficiency . the achievement establishes the theoretic basis of the whole research
首先，从波场延拓的单程波方程出发，系统地研究了频率波数域的波场延拓算子之间的相互关系和转换条件并在此基础上提出了能适应剧烈横向变速的频率波数域稳定的变参考慢度rytov近似广义屏波场延拓算子( vrselrf )和部分波场延拓改进方案及提高运算效率的措施，为整个研究打下理论基础。 - In the wavefield - spread area , we uses the phase - shift operator as constraint in frequency - wavenumber field , while beyond the wavefield - spread data , we uses zero point at the ends of phase - shift operator as constraint to take discrete smooth interpolation so that the resulted operator satisfies two - order smooth and the length of this operator can be selected shorter in frequency - space field
通过离散光滑插值法，在频率波数域中，以传播区内的相移算子为约束，在传播区外的算子两端处以零点为约束，进行离散光滑插值，使得所得算子具有二阶光滑可导性，则其对应的频率空间域中的算子就可以取得很短。