Established the method of extracting first arrival time from the ultrasonic signal in the process of CT inversion. 建立CT反演中由超声波信号提取首波时间的拾取方法。
We introduce the backward first arrival time and the forward first arrival time, and discuss their probability distributions and properties. Finally, we get the decomposition theorems of the forward taboo probability and the backward taboo probability. 6. 引进了向后首达时间和向前道达时间,讨论了他们的分布及性质,得到了向前禁止概率分解定理和向后禁止概率分解定理。
In process of data processing, we used the techniques, such as filtering, edition surgical blanking, prediction deconvolution, fitting static correlation of first arrival time, and velocity analysis, and obtained a high-qualitative shallow seismic reflection sounding profile. 数据处理过程中采用了滤波、编辑切除、预测反褶积、初至时拟合静校正和速度分析等技术,得到了高质量的浅层地震反射探测剖面。
Optimal model for first arrival time distribution function and risk minimum model 首达时间依分布最优模型与风险最小模型
The paper presents the fundamental principle of first arrival travel time tomography imaging, including establishment of the near surface model, ray trac - ing and calculation of the first arrival time, building of the inversion equation and conjugate gradient inversion meth - od. 给出了初至旅行时层析成像方法的基本原理,包括近地表模型的建立、射线路径和初至时间的计算、反演方程的建立以及共轭梯度反演方法等。