In orbit calibration of the non-orthogonality of the two fluxgate sensors onboard CSES

Earth, Planets and Space

Full Paper

Roland Lammegger¹  Yanyan Yang²  Zhima Zeren²  Xuhui Shen²  Andreas Pollinger³  Werner Magnes³  Yiteng Zhang⁴  Bingjun Cheng⁴  Bin Zhou⁴  Lei Li⁴  Yuqi Tong⁵ 

[1] Institute of Experimental Physics, Graz University of Technology, 8010, Graz, Austria;National Institute of Natural Hazards, Ministry of Emergency Management of China, 100085, Beijing, China;Space Research Institute, Austrian Academy of Sciences, 8042, Graz, Austria;State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, 100190, Beijing, China;Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences, 100190, Beijing, China;State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, 100190, Beijing, China;Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences, 100190, Beijing, China;School of Astronomy and Space Science, University of Chinese Academy of Sciences, 100049, Beijing, China;

关键词: High precision magnetometer;    Fluxgate magnetometer;    Instrument calibration;    CSES satellite;   

DOI  :  10.1186/s40623-023-01766-y

 received in 2022-08-11, accepted in 2023-01-04,  发布年份 2023

来源: Springer

【 摘 要 】

With the accumulation of data, it is possible to study the long-term variation of Fluxgate Magnetometers (FGM) of High Precision Magnetometer (HPM) onboard the China Seismo-Electromagnetic Satellite (CSES). The calibration method of HPM depends on an assumption that the linear parameters of FGM, including the gain factors, the offsets, and non-orthogonal angles are stable. However, HPM exhibits some unexpected trends in the scalar residuals when processed according to the assumption. Study on the residual finds out that under changing space thermal conditions, the non-orthogonal angles of FGM change periodically, suggesting that the data calibration method we used before should be modified. A multi-dimensional polynomial model is established for defining the change of non-orthogonal angles of FGM as a function of the sun incidence angles, geographic latitude and sensor temperature. Apply the polynomial model to data from August 2018 to May 2021, the standard deviation of the scalar residuals is reduced to around 0.5 nT and tends to be more random and in line with the normal distribution. Meanwhile, the variation trend in gain factors and offset factors are eliminated. Results show that the model can correctly reflect the period variation of the non-orthogonal angles of FGM with the space thermal conditions.Graphical Abstract

【 授权许可】

CC BY   
© The Author(s) 2023

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