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4.3实践中的偏移在这一节中,我们讨论影响克希霍夫求和法、有限差分法和f-k偏移法执行效能的各种参数。在克希霍夫偏移法中,重要参数是求和中使用的时窗宽度和偏移的最大倾角。在有限差分偏移和相移偏移法中,深度步长要选的适当。在Stolt偏移中,重要的是拉伸系数,还检查了速度误差对这些方法的影响。而且,使用一个含有许多倾斜同相的轴合成模型和另一个由绕射双曲线构成的模型,讨论了所有的实际情况。此外,还使用实际的资料例子来评价最佳参数的选择。在这一节中,把使用不同参数的不同算法的偏移成果与理想的偏移成果进行对比。
4.3 Practical Offsets In this section, we discuss the various parameters that affect the performance of the Kirchhoff summation method, the finite difference method and the f-k offset method. In the Kirchhoff’s offset method, the important parameter is the maximum tilt angle of the window width and offset used in the summation. In Finite Difference Offset and Phase Shift Offset methods, the depth step should be chosen appropriately. In the Stolt shift, the important factor is the stretch factor, and the effect of velocity error on these methods. Moreover, all practical situations are discussed using a model of a shaft composed of many oblique in-phase and another model of a diffractive hyperbola. In addition, examples of actual data are used to evaluate the best choice of parameters. In this section, the offset results of different algorithms using different parameters are compared with the ideal offset results.