Volume 36 Issue 3
May  2016
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REN Haiyan, ZENG Li, LIU Xu, WEI Dong, WANG Yan, CHEN Yu. Research of Spectrum Correction Method Based on All Phase FFT for Induction Magnetometer[J]. Journal of Space Science, 2016, 36(3): 366-372. doi: 10.11728/cjss2016.03.366
Citation: REN Haiyan, ZENG Li, LIU Xu, WEI Dong, WANG Yan, CHEN Yu. Research of Spectrum Correction Method Based on All Phase FFT for Induction Magnetometer[J]. Journal of Space Science, 2016, 36(3): 366-372. doi: 10.11728/cjss2016.03.366

Research of Spectrum Correction Method Based on All Phase FFT for Induction Magnetometer

doi: 10.11728/cjss2016.03.366
  • Received Date: 2015-05-26
  • Rev Recd Date: 2015-12-18
  • Publish Date: 2016-05-15
  • Induction magnetometer,based on Faraday's law,is used to measure the magnetic field changes with low frequency in space.It usually has the function of on-orbit FFT spectrum analysis, which can obtain the information of magnetic field fluctuation directly,such as frequency and amplitude.However,when using FFT to process the truncated signal,non-complete period sampling will cause spectrum leakage and fence effect.Namely the spectrum information will generate deviations, which affects the accuracy of real-time monitoring of magnetic field changes.Compared with traditional FFT,the all-phase FFT with phase invariability can effectively prevent spectrum leakage.In this paper,an all-phase time-shift phase difference method (apFFT/apFFT) is used to correct the aveform data of a satellite induction magnetometer.Simulation and experimental results indicate that this method can improve the measurement accuracy.This study also provides a method about on-orbit spectrum analysis for the next generation of spaceborne induction magnetometer.

     

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