The depth migration with higher-order approximation by time-shift algorithm eliminates the frequency dispersion and amplitude distortion in the calculation process.
本文使用高阶方程深度偏移方法，并且在计算中采用了一种与差分运算等价的时移法解决了计算中出现的频散和振幅失真问题。
The basic idea of WENO is to obtain a higher approximation by a linear combination of low order numerical fluxes.
WENO格式的主要思想是通过低阶的数值流通量的凸组合重构得到高阶的逼近，并且在间断附近具有本质无振荡的性质。
In particular, the highest approximation order is higher than other obtained summation operators.
特别地，新算子的最高逼近阶明显高于目前已有的求和算子。
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