中文摘要：

船舶静电场深度换算技术是船舶电场隐身技术中的重要步骤。用模拟源法进行船舶静电场深度换算，其计算过程过于复杂，而基于拉式方程的换算方法只适用于向较深方向换算，无法解决向较浅方向换算的问题。针对以上难点，提出一种迭代换算法。该方法根据静态电场各分量在垂直方向上的偏导数建立不同深度上静电场场强之间的关系，利用微分学的求导公式，迭代计算目标深度上与测量点具有相同水平坐标点的静态电场值。仿真结果表明：该方法计算简便，且具有较高的换算精度。

英文摘要：

The depth extrapolation of ship＇s electric field is an important means in the stealth technology of ship＇s electric field. The calculating process is extremely complicated when the modulating method is used for exploration. And the extrapolation method based on Laplace function applies only to deeper depth exploration but not to shallower depth exploration. In order to solve this difficult problem, an iteration method is proposed. Based on the vertical partial derivative of each component of the static electric field and the derivation formula, the relationship between the electric fields at dif- ferent depths is established and the static field values of the points at the target depth that have the same coordinates as the measured points are calculated iteratively. The simulation result shows that this method is not only convenient for calculation but also high in calculation precision.