为了克服理想匹配层的差分误差，减少计算开销，提出数值匹配条件。
Numerical matched condition is proposed to overcome the difference error and to reduce the computational expense of PML.
采用理想匹配层边界条件以有效吸收边界面上的出射波，并与色散边界条件的吸收效果作比较。
The perfectly matched layer (PML) boundary condition is used to effectively absorb out going wave on the boundary plane by comparison with the absorbing performance of dispersive boundary condition.
和已有的离散方案比较，采用文中提出的离散方案可使理想匹配层吸收边界的反射误差成数量级地减小。
Compared with the discretization scheme proposed earlier, the new one makes the reflection errors of PML absorbing boundary condition decrease by orders of magnitude when a larger time step is used.
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