Volume 42 Issue 2
Mar.  2022
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Article Navigation >  Chinese Journal of Space Science  > 2022  >  42(2): 284-293
CHEN Wuxiang, WANG Jindong, LÜ Shang, LI Yunpeng, XUE Yongliang, SONG Wei. Simulation Research on Precision Digital Fluxgate Magnetometer Based on Sigma-Delta Modulation Technology (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 284-293. DOI: 10.11728/cjss2022.02.210121010
Citation: CHEN Wuxiang, WANG Jindong, LÜ Shang, LI Yunpeng, XUE Yongliang, SONG Wei. Simulation Research on Precision Digital Fluxgate Magnetometer Based on Sigma-Delta Modulation Technology (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 284-293. DOI: 10.11728/cjss2022.02.210121010
shu

Simulation Research on Precision Digital Fluxgate Magnetometer Based on Sigma-Delta Modulation Technology

doi: 10.11728/cjss2022.02.210121010 cstr: 32142.14.cjss2022.02.210121010
  • 1.

    State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049

  • Received Date: 2021-01-19
  • Accepted Date: 2021-10-27
  • Rev Recd Date: 2021-10-11
    • Available Online: 2022-05-25
    Abstract
  • A precision digital fluxgate magnetometer was designed based on Sigma-Delta modulation technology. Signal processing simulation model is carried out with Simulink tools in Matlab, simulation analysis of magnetometer characteristics is given, including the noise, linearity, response speed and frequency characteristic. The simulation results show that the measurement range of 1 bit digital magnetometer could reach more than ±105 nT to cover Earth magnetic field, system noise is lower than 4.66 pT·Hz–1/2 at 1 Hz which means the resolution is sufficient for deep space magnetic field exploration. The maximum nonlinear error is 0.16 nT and the dynamic response speed reaches 2×106 nT·s–1 and the efficient Bandwidth is higher than 10 Hz. The simulation results indicate that 1bit digital fluxgate magnetometer could effectively reduce the critical requirements of the accuracy on the A/D converter, simplify the analog signal processing electrical circuit and improve the system reliability. The performance of 1 bit Sigma-Delta digital magnetometer indicates its impressive advantages over traditional magnetometers and wide application prospects in the field of deep space exploration and space magnetic field measurement.

     

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