A method of in-orbit calibration of fluxgate magnetometer based on the measurement of absolute scalar magnetometer
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摘要: 卫星在轨进行磁场测绘及监测时,需要高精度的磁场值,但由于磁通门磁强计三轴非正交性以及零点漂移所引起的误差大大降低了磁强计的测量精度,因而有必要对此进行校正.本文利用绝对标量磁强计,采用一种改进的最小二乘标定算法,通过不断迭代实现对磁通门三轴正交性和零点漂移的修正.结果表明,在考虑了磁强计本身噪声水平的实际情况下,磁通门磁强计的误差可由100nT左右修正到0.2nT以内.该算法为卫星在轨高精度磁场测量提供了一种可行的方法.Abstract: High precision measurement of the magnetic field is required for in-orbit magnetic field monitoring and mapping. Due to the restrictions of processing technology and installation, the three axes of fluxgate magnetometer cannot be strictly orthogonal and the offsets in three directions are unknown in actual measurement. To solve this problem, it is necessary to determine the alignment and offset of the fluxgate magnetometer in-orbit instead of on the ground. According to the method of calibrating with scalar magnetometer, a method for calibrating the alignment, sensitivity, and offset by an improved least square calibration algorithm is proposed. Results show that considering the noise of detector itself, the error of fluxgate magnetometer can be reduced from about 100nT to less than 0.2nT. This calibration algorithm offers a feasible way of in-orbit high-precision measurements.
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Key words:
- Fluxgate magnetometer /
- In-orbit calibration /
- Calibration algorithm
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[1] Yuan Zhirong. All status error compensation about three axis magnetic heading sensor[J]. J. Trans. Technol., 2003, 22(9):34-36. In Chinese (袁智荣. 三轴磁航向传感器的全姿态误 差补偿[J]. 传感器技术, 2003, 22(9):34-36) [2] Liu Jingbiao, Zheng Yubing, Zhang Xueting. Design and error correction of three-axis magnetic compass[J]. Proc. Autom. Instr., 2008, 29(9):10-1. In Chinese (刘敬彪, 郑玉冰, 章雪挺. 三轴磁罗盘的设计与误差校正[J].自动化仪表, 2009, 29(9):1-10) [3] Wu Dehui, Huang Songling, Zhao Wei. Research on correction of tri-axial magnetometer based on FLANN[J]. Chin. J. Sci. Instr., 2009, 30(3):449-453. In Chinese (吴德会, 黄松岭, 赵伟. 基于FLANN的三轴磁强计误差校正研究[J]. 仪器仪表学报, 2009, 30(3):449-453) [4] Lin Chunsheng, Xiang Qian, Gong Shenguang. Ortho-error analysis and rectification of three-axis magnetometer[J]. J. Detect. Contr., 2005, 27(2):9-12. In Chinese (林春生, 向前, 龚沈光. 三轴磁强计正交误差分析与校正[J]. 探测与控制学报, 2005, 27(2):9-12) [5] Farrell W M, Thompson R F, Lepping R P, Byrnes J B. A method of calibrating magnetometers on a spinning spacecraft[J]. IEEE Trans. Magn., 1995, 31(2):966-972 [6] Yin Fan. Mathematic Approaches for the Calibration of the CHAMP Satellite Magnetic Field Measurements[D]. Potsdam: University of Potsdam, 2010 [7] Hisayoshi Shimizu, Futoshi Takahashi, Naoku Horii, et al. Ground calibration of the high-sensitivity SELENE lunar magnetometer[J]. Earth Planets Space, 2008, 60(4):241 [8] Gao Huixuan. Applied Multivariate Statistical Analysis[M]. Beijing: Peking University Press, 2005. In Chinese (高惠璇. 应用多元统计分析[M]. 北京: 北京大学出版社, 2005) -
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