The finite difference depth migration equation in space-frequency domain can be derived when the radical expression is approximated by continued fraction.

采用连分式近似，可以得到空间频率域的有限差分深度偏移方程。

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Then two conventional envelope migration compensation algorithm was introduced, on this basis, a new algorithm called frequency domain correction was proposed.

接着介绍了两种常规的包络走动补偿算法，在此基础上提出了一种新的算法称之为基于频域校正的包络补偿算法。

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A new method which using two order keystone transform to correct quadratic migration and frequency domain correction to correct once migration was proposed.

提出了一种新的解决方法，即利用二阶keystone变换补偿时间二次项，然后用频域校正算法补偿时间一次项。

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