改进的内外映射法推算潜艇外部感应磁场

Extrapolation of submarine's external induced magnetic field by improved internal and external reflection method

潜艇闭环消磁系统的关键在于外部磁场的推算精度,其决定了潜艇感应磁场和部分固定磁场的补偿效果。针对目前存在算法精度不高的问题,提出一种改进的内外映射法,不需要考虑潜艇内部磁传感器的安装姿态,且只需同时测量4组潜艇的内部磁场和外部磁场,就能得到两者的映射关系矩阵K,利用其来推算得到在不同地磁场作用下潜艇的外部感应磁场。开展了潜艇模型验证实验,将推算结果与测量结果进行比较,相对均方根误差最大仅为4.20%,满足了推算精度要求,证明了该方法的可行性。

The key of submarine’s closed-loop degaussing system is external magnetic field extrapolation, whose precision decides the compensation effect of submarine’s induced magnetic field and parts of permanent magnetic field. For solving the present problem of low precision in extrapolation, an improved internal and external reflection method was put forward. Without considering the installation posture of internal magnetic sensors in submarine model, the related matrix between internal and external magnetic field was solved by measuring only four different groups of magnetic field. Through the related matrix, the external induced magnetic fields were extrapolated under different geomagnetic effect. In a verification experiment, the extrapolated results were compared to the measured results.The biggest relative root mean square error is4.20%, which shows the feasibility of this improved algorithm.