舰船感应磁场的计算及其误差分析方法

Calculation and Error Analysis Method for Induced Magnetic Field of Ships

摘要:

当前舰船磁场建模与测量大都是在舰船静止的情况下所建立起来的。为适应舰船航行的真实环境，迫切需要一种适用于运动舰船所产生的感应磁场的计算方法。通过测试点分析与理论推导，介绍了4种舰船感应磁场的计算方法。最后，通过评估计算值与测量值的绝对误差的最大值对4个计算方法进行了分析。结果证明，方法3和4可以用来评估舰船磁场计算结果误差，并可通过进一步计算得到感应磁场的其他未知量。测量计算试验表明：建议采用在4个主要航向上进行联合测量的方法。

关键词:运动舰船;感应磁场;计算方法

Abstract:

The current modeling and measurement of ships’ magnetic field are mostly established when the ship is under stationary conditions. In order to adapt to the real environment of ship under navigation，there is an urgent need for a calculation method suitable for the induced magnetic field generated by a moving ship. Through the analysis of test point and theoretical derivation，4 calculation methods of ship induced magnetic fields are introduced. Finally，these 4 calculation methods are analyzed by evaluating the maximum absolute error between the calculated value and the measured value. The results show that method 3 and 4 can be used to evaluate the error of the ship's magnetic field calculation results，and other unknowns of the induced magnetic field can be obtained by further calculation. Measurement and calculation tests show that it is recommended to use joint measurements in 4 major headings.

Key words:moving ship;induced magnetic field;calculation method