利用实时测量的内部磁场值准确推算出外部空间目标磁场值是潜艇实现闭环消磁要解决的关键技术之一.通过虚拟磁源法,得到了表征潜艇内外空间磁场变化量之间关系的表达式.对利用积分方程法模拟得到的潜艇模型内外空间磁场进行了仿真实验,实验结果表明:用内部数据推算得到的外部空间磁场与仿真数据几乎完全吻合.在实验室用潜艇模型进行了验证实验,推算数据与实测数据依然吻合,相对均方根误差最大为6.5％,该方法可用于潜艇闭环消磁中外部空间磁场推算.%It is one of the key techniques for the submarine's closed-loop degaussing (CLDG) system . To use the submarine's inner magnetic field measure at real time to extrapolate its exterior target magnetic field. Taking the magnetic moment as the virtual source of submarine magnetic field, an expression that denotes the relationship between the magnetic field variation inside the submarine and outside it was deduced. The induced magnetic field inside and outside a submarine numerical model established by the integral equation method was simulated. The result shows that the values extrapolated from the inner magnetic field entirely agree with the simulated values of the exterior magnet field. Then an experiment as verification is carried out in the laboratory and the extrapolated values still agreed with the measured values well. The relative error of the root mean square is less than 6.5%. So this method can be used for the extrapolation of magnetic field outside the submarine in CLDG.
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