基于弹载磁传感器的地磁场畸变方向测量方法

Geomagnetic Field Distortion Direction Measurement Method Based on Missile-borne Magnetic Sensor

针对利用地磁场进行空中目标探测与定位时仅以地磁信息不易直接获得目标方位的问题,提出利用弹载三轴磁传感器对铁磁性目标周围磁场畸变方向的测量方法。建立基于弹丸姿态角及磁场测量值的磁场方向解算模型,并在模型中引入传感器自身误差。利用Ansys Maxwell有限元软件进行静态磁场仿真,提取弹丸运动轨迹上的地磁分量带入磁场方向解算模型,并将解算结果与静态磁场仿真数据进行对比,结果表明利用磁传感器测量值结合弹丸姿态角进行地磁场中铁磁性目标周围畸变磁场方向测量的原理可行,并且在对传感器自身误差进行校正后可提高对磁场方向测量解算的精度。

In view of the difficulty in obtaining the air target position directly only with the geomagnetic information when using the geomagnetic field for target detection and positioning,a method of measuring the magnetic field distortion direction around the ferromagnetic target using the missile-borne three-axis magnetic sensor was proposed.A calculation model of the magnetic field direction based on the projectile attitude angle and the measured value of the magnetic field was established,and the error of the sensor itself was introduced into the model.Ansys Maxwell finite element software was used for static magnetic field simulation,and the geomagnetic component on the trajectory of the projectile was extracted and brought into the magnetic field direction solution model,and the solution results were compared with the static magnetic field simulation data.The results showed that the principle of measuring the direction of the distorted magnetic field around the ferromagnetic target in the geomagnetic field was feasible by using the measurement value of the magnetic sensor combined with the attitude angle of the projectile,and the accuracy of the measurement and calculation of the magnetic field direction could be improved after correcting the error of the sensor itself.