Signal Separation of Ionospheric and Magnetospheric Magnetic Field During the Magnetic Quiet Period Based on FIR Filter

GUO Fei; QIU Yaodong; WANG Zhengtao

doi:10.13203/j.whugis20180157

Volume 44 Issue 6

Jun. 2019

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Geomatics and Information Science of Wuhan University > 2019 > 44(6): 844-850. > DOI: 10.13203/j.whugis20180157

GUO Fei, QIU Yaodong, WANG Zhengtao. Signal Separation of Ionospheric and Magnetospheric Magnetic Field During the Magnetic Quiet Period Based on FIR Filter[J]. Geomatics and Information Science of Wuhan University, 2019, 44(6): 844-850. DOI: 10.13203/j.whugis20180157

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Signal Separation of Ionospheric and Magnetospheric Magnetic Field During the Magnetic Quiet Period Based on FIR Filter

1.
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China

Funds:

The National Science Fund for Distinguished Youth Scholars 41525014

the National Natural Science Foundation of China 41774019

the National Natural Science Foundation of China 41274032

the National Natural Science Foundation of China 41474018

the National Natural Science Foundation of China 41429401

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Author Bio:
GUO Fei, master, specializes in satellite magnetic data processing, satellite perturbation forces and geostress. E-mail:fguo_sgg@whu.edu.cn
Corresponding author:
WANG Zhengtao, PhD, professor. E-mail:ztwang@sgg.whu.edu.cn
Received Date: December 25, 2018
Published Date: June 04, 2019

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Abstract

Abstract

Swarm, the fourth "Earth Explorer" mission of the ESA, is mainly to determine the geomagnetic field. One of the key issues in using Swarm's data to construct the magnetic field model for each layer of the earth is to accurately separate geomagnetic signals from different field sources. In this paper, based on quiet magnetic period observations data of the ESA's Swarm satellites, the external source fields are processed with finite impulse response (FIR) high-pass filtering along the satellite tracks, the length of the filter window is discussed. In addition, the feasibility of this method is proven by the MIO_SHA_2D and MMA_SHA_2C, which are ionospheric and magnetospheric magnetic field models published by the ESA in 2016. The results indicate that the outcome of FIR filter for long wave signals of the external source fields well agree with the model correction results. When the passband and stopband wavelengths are set to 1 200 km and 3 000 km, respectively, if we set the length of the filter to 87-129 orders, it can achieve a better balance of the filtering accuracy in the horizontal and radial.
- FIR filter,
- ionospheric and magnetospheric magnetic field,
- Swarm,
- MIO_SHA_2D model,
- MMA_SHA_2C model

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References

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