Accurate calculating method of marine three-component geomagnetic field in shipboard measurement

In order to remove ship magnetizing field´s interference, a method is proposed to calculate marine three-component geomagnetic field accurately. Ship magnetizing field can be shown by magnetizing parameter and it is hard to be obtained. The bound of geomagnetic vector can be got by WMM and magnetic total value can be measured in advance, thus geomagnetic vector and magnetizing parameter are taken as unknown quantities simultaneously to maximally eliminate solve for eliminating ship´s magnetic interference. GAPSO is used to calculate based on measured value when ship sails and sway in circle, simulation indicates that three-component geomagnetic field can be got in high precision and ship´s magnetic interference is removed effectively. The method is easy to operate and has important practical value for geomagnetic field´s marine survey.