快速计算正常时差的新算法

A NEW ALGORITHM FOR FAST NMO CALCULATION

本文在分析了《地震勘探资料数字处理方法》一书中两种计算正常时差(NMO)的快速算法的特点后,基于双曲线旅行时方程,提出了一种新的快速算法——△t迭代法。迭代形式为△t=x^2/(2t_0+△t)v^2(t_0)文中分析了这种方法的收敛性,给出了选择△t初值的原则。计算结果表明这种方法具有速度快、精度高、适应性强的特点。

After examining the two algorithms for fast NMO calculation carried in 'the digital processing technique for seis-mic'by Mr. Mu Yongguang,and in line with the hyperbolic time-distance equation, a new algorithm - the At iteration algorithm was presented. The expression for the iteration is △t=x2/(2t0+△t)ν2t0 The convergence of this algorithm was examined and the principle for initial At selection was given. Results show that the algorithm has the merits of fast calculating speed, hight accuracy and wide adaptability. For this reason, it is recommended to be spread to the application.