The new method changing three axis digital fluxgate to two axis digital fluxgate based on world magnetic model (WMM) is introduced.Firstly,the latest version of world magnetic model is introduced.Then the principle of the three axis digital fluxgate is analyzed.Lastly,the method of two axis digital fluxgate is realized by WMM.The experimental data from different location show that the heading error meets the system requirements of UAV flight by using WMM.Relative to three axis digital fluxgate,the structure of two axis digital flux gate changes from the three dimensional into two dimensional plane,the range of UAV is not limited,heading error of UAV also meets demands.Two axis digital fluxgate is also in line with the development trend of small volume,miniaturization and high precision of UAV.%介绍了一种利用地磁模型把三轴数字磁通门变为两轴数字磁通门的方法,首先介绍了一种最新版本的地球磁场模型;接着分析了三轴数字磁通门的工作原理;最后通过利用地磁模型给出了实现两轴数字磁通门的方法.通过不同地点的实验数据表明,利用地磁模型后,两轴数字磁通门的航向误差满足无人机飞行的系统要求.相对于三轴数字磁通门而言,两轴数字磁通门结构由三维立体变成了二维平面,飞机的活动范围也不受限制,航向误差也满足要求.两轴数字磁通门也符合了无人机小体积、微型化、高精度的系统发展趋势.
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