A Hybrid Method for Interference Mitigation in GNSS Signals

Nabeel Ali Khan and Luis Enrique Aguado

Peer Reviewed

Abstract:	A novel instantaneous frequency-based jamming interference suppression method for GNSS signals is developed. The spectrogram-based jammer instantaneous frequency estimation methods suffer from resolution limitation whereas the adaptive notch filter-based methods fail to track fast varying chirps with sudden jumps. We propose a novel jammer frequency estimation method based on the combination of these two approaches. The instantaneous frequency information is then exploited to remove the interference by applying zero-phase notch filtering that overcomes the problem of non-linear phase distortion common in notch filter-based methods. Experimental results indicate that the proposed hybrid approach achieves better interference suppression in GNSS signals as compared to other instantaneous frequency-based mitigation methods.
Published in:	Proceedings of the 37th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2024) September 16 - 20, 2024 Hilton Baltimore Inner Harbor Baltimore, Maryland
Pages:	3406 - 3413
Cite this article:	Khan, Nabeel Ali, Aguado, Luis Enrique, "A Hybrid Method for Interference Mitigation in GNSS Signals," Proceedings of the 37th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2024), Baltimore, Maryland, September 2024, pp. 3406-3413. https://doi.org/10.33012/2024.19858
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