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

Yuqi Tong, Bin Zhou*, Lei Li, Bingjun Cheng, Yiteng Zhang, Werner Magnes, Roland Lammegger, Andreas Pollinger, Yanyan Yang, Zhima Zeren, Xuhui Shen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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: [Figure not available: see fulltext.].

Original languageEnglish
Article number21
JournalEarth, Planets and Space
Volume75
Issue number1
DOIs
Publication statusPublished - 2023

Keywords

  • CSES satellite
  • Fluxgate magnetometer
  • High precision magnetometer
  • Instrument calibration

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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