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A combined iCEEMDAN and VMD method for mitigating the impact of ionospheric scintillation on GNSS signals

  • Research Article - Atmospheric & Space Sciences
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Abstract

Severe amplitude and phase scintillation induced by the ionospheric plasma density irregularities degrades the performance of global navigation satellite system (GNSS) receivers. Scintillation typically has adverse effects at the tracking process and thus adversely affects the raw GNSS measurements used in a number of applications. Hence, it is important to develop robust methodologies for detecting and mitigating ionospheric effects on the GNSS signals. In this paper, we propose a novel method based on the combination of improved complete ensemble empirical mode decomposition with adaptive noise (iCEEMDAN) and variational mode decomposition (VMD) methods. The proposed method employs a detrended fluctuation analysis (DFA)-based metric for robust thresholding between the scintillation-free and amplitude scintillated GNSS signals. The major contribution of the proposed method is development of novel approaches for selection of intrinsic mode functions (IMFs) based on DFA and optimised selection of [K, \({\alpha }\)] parameters of the VMD. The performance of the proposed method was evaluated and was observed that it is better than existing ionospheric scintillation effects mitigation algorithms for both simulated and real-time GPS scintillation datasets. The proposed method can denoise approximately 9.23–15.30 dB scintillation noise from the synthetic and 0.2–0.48 from the real scintillation index (\(S_{4}\)) values. Therefore, the proposed (iCEEMDAN-VMD) method is appropriate for mitigating the ionospheric scintillation effects on the GNSS signals.

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Acknowledgements

Authors are thankful and would like to acknowledge Low-Latitude Ionospheric Sensor Network (LISN), Brazil, and Cornell Scintillation Model (CSM) for providing the dataset used in this work.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science, Pilani, K.K. Birla Goa Campus, Goa, 403726, India

    Abhijit Dey, Rohan Chhibba & Nitin Sharma

  2. Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, K L University, Vaddeswaram, Guntur, Andhra Pradesh, 522502, India

    Devananboyina Venkata Ratnam

Authors
  1. Abhijit Dey
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  2. Rohan Chhibba
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  3. Devananboyina Venkata Ratnam
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  4. Nitin Sharma
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Correspondence to Abhijit Dey.

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On behalf of all authors, I state that there is no conflict of interest.

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Communicated by Prof. Stelios Stoulos.

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Dey, A., Chhibba, R., Ratnam, D.V. et al. A combined iCEEMDAN and VMD method for mitigating the impact of ionospheric scintillation on GNSS signals. Acta Geophys. 69, 1933–1948 (2021). https://doi.org/10.1007/s11600-021-00629-y

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  • DOI: https://doi.org/10.1007/s11600-021-00629-y

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