根据在ANSYS中的建模和剖分情况，把成像区域离散成了有限个小网格后，就可以把待求的目标函数看成是矩阵，矩阵中的每个元素是与小网格的节点一一对应的。
In accordance with the ANSYS modeling and mesh, imaging region is separated in to small grids. Then the objective function is seemed as a matrix which each element with a small mesh of nodes.
分析了采用这种双重网格地震层析成像技术的必要性，模型实验证实了此技术实用性和有效性。
The model tests show that this double grid cross-hole seismic tomography strategy is necessary and efficient, and the image results demonstrate that the method is superior to the conventional ones.
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