基于速度估计的改进型线性变换有限差分偏移在探地雷达中的应用

为了解决传统线性变换有限差分偏移算法对变速介质的高敏感性问题,对加入了速度变量的标量波动方程进行线性变换,在横向非均匀介质条件下,详细推导了包含混合因子项的线性变换差分偏移方程,实现了横向非均匀介质中陡倾角反射界面的正确归位,同时改进型算法可以灵活地选择混合因子项,这样就增强了原算法对复杂地质问题的适应能力,在此基础上...

The application of the improved linear transformation of finite difference migration based on the velocity estimation in the GPR date processing

For the purpose of solving the problem of high velocity sensitivity of the traditional linear transformation of the finite difference migration algorithm, the paper applied the linear transformation to the scalar wave equation, in which the speed parameter is added. Through a series of detailed and accurate derivation, a new inhomogeneous wave equation is derived, which contains a mixed factor item. With the improved migration algorithm, the steep-dip reflection migration is achieved in the laterally inhomogeneous circumstances. Simultaneously, for the merit of the flexibility to select the mixed factor item, the adaptability of the traditional algorithm is enhanced when dealing with more complex geological problems, which also reflects the importance of the mixed factor item in different geological problems. In order to reduce the input errors, the paper combines the velocity estimates, and put forward an improved linear transformation of finite difference migration algorithm based on the velocity estimation. The migration accuracy is enhanced effectively after applying the improved algorithm to the real GPR (Ground Penetrating Radar) data processing, in which the main reflector and multiple reflection particles both exist.