Adaptive Smoothness Constraint Ionospheric Tomography Algorithm
1
School of Geographical Sciences, Guangzhou University, Guangzhou 510006, China
2
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(8), 2404; https://doi.org/10.3390/s20082404
Received: 12 March 2020
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Revised: 8 April 2020
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Accepted: 20 April 2020
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Published: 23 April 2020
(This article belongs to the Special Issue GNSS and Emerging Applications)
Ionospheric tomography reconstruction based on global navigation satellite system observations is usually an ill-posed problem. To resolve it, an adaptive smoothness constraint ionospheric tomography algorithm is proposed in this work. The new algorithm performs an adaptive adjustment for the constrained weight coefficients of the tomography system. The computational efficiency and the reconstructed quality of ionospheric imaging are improved by using the new algorithm. A numerical simulation experiment was conducted in order to validate the feasibility and superiority of the algorithm. The statistical results of the reconstructed errors and the comparisons of ionospheric profiles confirmed the superiority of the new algorithm. Finally, the new algorithm was successfully applied to reconstruct three-dimensional ionospheric images under geomagnetic quiet and geomagnetic disturbance conditions over Hunan province. The tomographic results are reasonable and consistent with the general behavior of the ionosphere. The positive and negative phase storm effects are found during geomagnetic storm occurrence.
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Keywords:
adaptive smoothness constraint; ionospheric tomography; ill-posed problem; ionospheric electron density; slant total electron content
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MDPI and ACS Style
Wen, D.; Mei, D.; Du, Y. Adaptive Smoothness Constraint Ionospheric Tomography Algorithm. Sensors 2020, 20, 2404. https://doi.org/10.3390/s20082404
AMA Style
Wen D, Mei D, Du Y. Adaptive Smoothness Constraint Ionospheric Tomography Algorithm. Sensors. 2020; 20(8):2404. https://doi.org/10.3390/s20082404
Chicago/Turabian StyleWen, Debao, Dengkui Mei, and Yanan Du. 2020. "Adaptive Smoothness Constraint Ionospheric Tomography Algorithm" Sensors 20, no. 8: 2404. https://doi.org/10.3390/s20082404
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