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Volume 7, issue 3 | Copyright
Geosci. Instrum. Method. Data Syst., 7, 189-193, 2018
https://doi.org/10.5194/gi-7-189-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 03 Jul 2018

Research article | 03 Jul 2018

Background noise estimation of the geomagnetic signal

Xiuyi Yao1, Suqin Zhang2, Yuntian Teng2, and Dongmei Yang2 Xiuyi Yao et al.
  • 1Yunnan Earthquake Agency, Kunming, China
  • 2Institute of Geophysics, China Earthquake Administration, P.O. Box 166, Beijing, China

Abstract. A fast Fourier transform was applied to fit the geomagnetic diurnal variation. Fitting results showed that when the polynomial degree was greater than 160, the residual error was close to 0nT. White noise is the main component of the residual error when the polynomial degree was greater than 160, so this method was adopted to calculate the background noise of the geomagnetic field. Spectrum analysis further demonstrated that the noise estimation result is reliable.

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A fast Fourier transform was applied to fit the geomagnetic diurnal variation. Fitting results showed that when the polynomial degree was greater than 160, the residual error was close to 0 nT. White noise is the main component of the residual error when the polynomial degree was greater than 160, so this method was adopted to calculate the background noise of the geomagnetic field. Spectrum analysis further demonstrated the necessity to remove background noise from geomagnetic data.
A fast Fourier transform was applied to fit the geomagnetic diurnal variation. Fitting results...
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