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最小走时
相关语句
  minimum travel time
     This method involves forward modeling wavefield identification,interactive travel time pickup,minimum travel time ray tracing in the interface net,spline coefficient inversion instead of slowness inversion and final velocity field synthesising.
     该方法利用正演模型识别波场,用交互法拾取走时,采用界面网最小走时射线追踪法进行射线追踪,并用反演样条系数代替反演慢度,最后合成速度场。
短句来源
  “最小走时”译为未确定词的双语例句
     The wavefront expanding method with interface points as secondary sources is studied in the paper which aims to solve the problems.
     本文提出的界面二次源波前扩展法全局最小走时射线追踪技术(以下简称界面源法)旨在解决上述两个问题.
短句来源
     A SEISMIC TOMOGRAPHY METHOD WITH SHORTEST TRAVELTIME RAY TRACING
     最小走时射线追踪层析方法
短句来源
     The paper introduces the basic principle of seismic refraction tomography method in SeisImager program package, which is the minimum traveltime tree algorithm.
     文章介绍了SeisImager软件中折射层析算法的基本原理和最小走时树方法。
短句来源
     WTBased on the finite element method and the interface point method of shortest path ray tracing, reverse-time migration for anisotropic elastic waves is carried out.
     利用有限元法和最小走时射线追踪的界面点法 ,实现了各向异性弹性波的叠前逆时偏移 .
短句来源
     Research on Minimum Traveltime of Tomography for Ground Stress Anomaly and Karst Collapse Column in Deep Coal Mining
     深部开采地应力异常及陷落柱最小走时层析成像研究
短句来源
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  相似匹配句对
     The effects of N,P,K on flower quality are different;
     P肥.
短句来源
     A New Type Of Minimum System
     新型系统
短句来源
     Hard to work out the global minimum traveltime of hypervalue traveltimes.
     ② 难于求出多值走时中的全局走时
短句来源
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  minimum travel time
However, a model based on minimum travel time does not account for all types of travelers.
      
Note that at the social optimum, the travel time of each arc should be equal to the minimum travel time on this arc.
      
PKKP data stacks and minimum travel time curves for scattering at the ICB.
      
This represents the minimum travel time from an injection well to the ground surface.
      
The delay of each vehicle is calculated by deducting the minimum travel time from vehicle's actual travel time.
      


A new ray tracing method ,the shortest path method suggested by Moser ,is used in seismic tomography. This paper proposes an algorithm to realize it and proves a formula to calculate Jacobian matrix for inversion. Some examples given here indicat that the method have some advantages ,especially, available for imaging of complex structure.

本文给出一种以费马原理和绕射理论相结合的最小走时射线追踪层析成像方法。该方法的特点是:(1)射线追踪运用了Moser提出的“最短路径”射线追踪原理,使得在射线阴影区仍可得到绕射波的最小走时,避免了射线追踪过程中的“跑靶”现象,并可以比较准确地模拟复杂结构的地震射线分布;(2)在层析反演中,采用逐次迭代算法,并加入约束条件和计算较为合理的雅可比矩阵,使得该方法适用于速度结构变化较大的地震层析解释。

Seismic ray tomography is referrcd to a nonlincar inversion problem which can be in principle solved in two phases: raytracing in an arbitrarily distributed velocity field and then solving a linearized inversion problem. In this paper, new techniqucs are adopted in the above two phases.In the forward problcm: (1) the shortest path method advocated by Moser (1991 ) is applied to construct ray paths, A relatively simple algorithm is then used to implement the raytracing and Calculate the minimum traveltime and...

Seismic ray tomography is referrcd to a nonlincar inversion problem which can be in principle solved in two phases: raytracing in an arbitrarily distributed velocity field and then solving a linearized inversion problem. In this paper, new techniqucs are adopted in the above two phases.In the forward problcm: (1) the shortest path method advocated by Moser (1991 ) is applied to construct ray paths, A relatively simple algorithm is then used to implement the raytracing and Calculate the minimum traveltime and the homologous trajectory for each pair of shot-receiver points; (2) the velocity distribution within each rectangular cell is approximated with a linear planar function, so that the analytic exprcssion of the elements in a Jacobian matrix or the derivatives of velocity with respect to traveltime at each node can be determined. In the inversion problem, two iterative algorithms used for least-square method and constrained dual space inversion problem and the derivation for damped minimum norm are presented. Computer simulation shows that the new method has advantage over conventional seismic tomographic methods such as ART, LSQR and CGLS, in precision and noise resistance. Moreover, due to applying the algorithm for large sparse matrix proposed by Scales, the computational speed is improved and there necds no large memory space.

地震射线层折成像方法是一个非线性的反演过程。从方法原理上讲,它主要由两部分组成,即任意速度分布的射线追踪和求解线性化反演问题。本文中,作者在这两个方面均采用了新的方法。在正演中,(1)应用Moser[1]提出的“最短路径”原理模拟地震射线,用较为简单的方法实现任意复杂介质结构的射线追踪,计算出每一对地点一接收点的最小走时及其对应的射线路径;(2)用线性平面函数去近似矩形单元内的速度分布,从而求出走时相对于每个节点上的速度变化的雅可比矩阵元素的解析式。在反演中,给出两种求解加权最小范数、最小二乘和对偶空间约束反演问题[2]的迭代算法。通过我们的计算机模拟实验表明,这种方法比常规的地震层析成像方法(如ART,LSQR,CGLS)不仅在精度上大大提高,而且有较强的抗噪声能力。在计算方面采用了Scales[3]提出的大型稀疏矩阵的算法,既加快了运算速度,又不需要很大的内存空间。

This method discretized the computed two-dimensional media into a networkconsists of a series of rectangular pixels,and put the computing network nodes onthe sides of each pixels.On the bases of Huygens'Principle and Fermat's Pinciple,we get the global minimum travel time on each nodes and their correspondingsecondary sources,using the wavefront point scanning instead of wavefront pointsorting,combined with the local minimum travel-time computing for each wavefront pionts using hyperbolic approximation.This...

This method discretized the computed two-dimensional media into a networkconsists of a series of rectangular pixels,and put the computing network nodes onthe sides of each pixels.On the bases of Huygens'Principle and Fermat's Pinciple,we get the global minimum travel time on each nodes and their correspondingsecondary sources,using the wavefront point scanning instead of wavefront pointsorting,combined with the local minimum travel-time computing for each wavefront pionts using hyperbolic approximation.This method has the following characteristics,such as:1.high c.omputing precision,2.robusteness even in solving the media Wwith very high velocity differences,3.less memory is needed,4.the accurately Computed travel-time and corresponding raypath can be easily used in travel time inversion and the wavefield computation based on the Maslov ray theory.

用慢度分块均匀正方形模型将介质参数化,仅在正方形单元的边界上设置计算结点,这些结点构成界面网.根据Huvsens和Fermat原理,由不断扩张、收缩的波前点扫描代替波前面搜索,在波前点附近点的局部最小走时计算中对波前点之间的走时使用双曲线近似,通过比较确定最小走时和相应的次级源位置,记录在以界面网点位置为指针的3个一维数组中.借助这些数组通过向源搜索可计算任意点(包括界面网以外的点)上的全局最小走时和射线路径.这一方法不受介质慢度差异大小限制,占内存少,计算速度较快,适于走时反演和以Maslov射线理论为基础的波场计算.

 
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