一种基于磁偶极子磁场分布理论的磁场干扰补偿方法

A Magnetic Disturbance Compensation Method Based on Magnetic Dipole Magnetic Field Distributing Theory

载体磁场对地磁场的干扰,一直是影响导航罗差、地磁测量的技术难题。为了提高适于地磁匹配定位需要的地磁测量精度,对如何消除载体固有磁场和感应磁场对地磁测量精度的影响进行了研究。应用磁偶极子磁场分布理论,推导了安装在载体上传感器所在位置的磁场组成,建立了利用理想传感器测量值计算地磁场的地磁测量模型;在分析磁场传感器测量误差的基础上,建立了综合考虑载体磁场干扰和传感器误差影响的地磁测量模型。该模型所含参数物理意义明确,可在任意姿态下实现对载体磁场和磁传感器误差进行综合补偿。实验证明,所建立的地磁测量模型具有较高的测量精度。

The interference of carrier magnetic field to geomagnetic field has been a difficult problem for a long time, which has influence on navigation compass deviation and geomagnetic measurement. How to eliminate the effect of inherent and induced magnetic fields of carrier on the measuring accuracy of geomagnetics was researched to increase the accuracy of geomagnetic measurement suitable for the need of geomagnetic matching localization. The magnetic dipole magnetic field distributing theory was applied to deduce the magnetic compasition in a position where the sensor is installed on the carrier. A geomagnetic measurement model was established with the ideal sensor magnetic measurement data. And a geomagnetic measurement compensation model including the magnetic disturbance of carrier and the error of sensor was built based on the analysis of the magnetic sensor error, in which the parameter meaning is specific and the errors of carrier magnetic field and magnetic sensor can be compensated in any case. The experimental results show that the model has higher geomagnetic measurement accuracy than that of others.