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。 A method of changing the three-axis digital fluxgate into a two-axis digital fluxgate by using a geomagnetic model is introduced. First, a new version of the earth magnetic field model is introduced. Then the working principle of the three-axis digital fluxgate is analyzed. Finally, the method of realizing two-axis digital fluxgate is given by using the geomagnetic model. Experimental data from different locations show that after using the geomagnetic model, the heading error of the two-axis digital fluxgate satisfies the system requirements of the UAV flight. Relative to the three-axis digital fluxgate, two-axis digital fluxgate structure from three-dimensional into a two-dimensional plane, the scope of the aircraft’s activities are not restricted, the heading error also meet the requirements. Two-axis digital fluxgate also meets the UAV small size, miniaturization, high-precision system development trend.