一种高精度星载磁强计系统级标定方法

A high-precision system level calibration method for spaceborne magnetometers

星载三轴磁强计经常被用于卫星在轨的姿态确认与修正,为提高其在轨磁场测量精度,提出了一种高精度的星载磁强计系统级标定方法。首先,引入了光学棱镜基准,完成了参照磁强计磁轴的正交性自校准。随后,利用二乘法完成了三轴零磁环境模拟系统线圈系数校准,再利用参照磁强计完成了三轴零磁环境模拟系统磁轴正交性标定,从而获得高精度的空间磁环境地面模拟系统。最后,利用三轴零磁环境模拟系统与卫星正交性对应关系,完成了星载磁强计的标定。试验结果表明:经过标定后,三轴零磁环境模拟系统非正交度优于0.01°,星载磁强计标定误差优于10 nT,为星载磁强计系统地面标定试验验证提供了新途径。

Spaceborne three-axis magnetometers are often used for attitude confirmation and correction of satellites in orbit.In order to improve the accuracy of in-orbit magnetic field measurement,a high-precision system level calibration method for spaceborne magnetometers is proposed.Firstly,an optical prism reference is introduced to achieve the orthogonality self-calibration of the reference magnetometer magnetic axis.Subsequently,the coil coefficient calibration of the three-axis zero magnetic environment simulation system is completed using the multiplication method.The magnetic axis orthogonality calibration of the three-axis zero magnetic environment simulation system is completed using a reference magnetometer,thereby obtaining a high-precision space magnetic environment ground simulation system.Finally,the calibration of the spaceborne magnetometer is completed using the orthogonality correspondence between the three-axis zero magnetic environment simulation system and the satellite.The experimental results show that the non orthogonality of the three-axis zero magnetic environment simulation system is better than 0.01°,and that the calibration error of the spaceborne magnetometer is better than 10 nT.The research provides a new approach for ground calibration and verification of spaceborne magnetometer systems.