A high-precision system level calibration method for spaceborne magnetometers
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.
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