This paper deals with the algorithms of equivalent dipole approximation and cubic interpolation for the electric field component of ground electrical bipole source.
基于偶极—偶极电极装置的瞬变响应表达式，建立了双极源电场的等效偶极和三次插值的快速近似算法。
Using linear interpolation method, computing formula of vertical component of electric field on the metal surface is obtained. The stability conditions of the algorithm are brought up.
采用线性插值方法获得了导体表面法向电场的计算公式，给出了算法的稳定性条件。
However, the influence on the radial distribution of the z-axial component of the electric field is small.
各腔长度变化对纵向场分量的径向分布影响很小。
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