耦合径向基函数和多项式基函数，形成一种新的近似函数。

A new approximate method based on coupled radial basis functions and polynomial basis functions is presented.

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在反演计算中，射线轨迹点处的慢度可用三次多项式基函数予以计算。

In inversion, the slowness at points on ray path can be calculated by using three order polynomial primary function.

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最后，本文采用紧支距离基函数取代多项式基函数，提出了局部径向点插值方法，这是一种真正意义上的无网格方法。

Lastly, using the compactly supported radial functional to take the place of the polynomial function, local radial point interpolation method, is presented in this paper.

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