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Sensors 2015, 15(9), 22167-22191; doi:10.3390/s150922167

A New Reassigned Spectrogram Method in Interference Detection for GNSS Receivers

1
School of Computer and Information, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China
2
School of Electronic and Information Engineering, Beihang University, XueYuan Road 37, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 2 June 2015 / Revised: 22 August 2015 / Accepted: 24 August 2015 / Published: 2 September 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [1655 KB, uploaded 2 September 2015]   |  

Abstract

Interference detection is very important for Global Navigation Satellite System (GNSS) receivers. Current work on interference detection in GNSS receivers has mainly focused on time-frequency (TF) analysis techniques, such as spectrogram and Wigner–Ville distribution (WVD), where the spectrogram approach presents the TF resolution trade-off problem, since the analysis window is used, and the WVD method suffers from the very serious cross-term problem, due to its quadratic TF distribution nature. In order to solve the cross-term problem and to preserve good TF resolution in the TF plane at the same time, in this paper, a new TF distribution by using a reassigned spectrogram has been proposed in interference detection for GNSS receivers. This proposed reassigned spectrogram method efficiently combines the elimination of the cross-term provided by the spectrogram itself according to its inherent nature and the improvement of the TF aggregation property achieved by the reassignment method. Moreover, a notch filter has been adopted in interference mitigation for GNSS receivers, where receiver operating characteristics (ROCs) are used as metrics for the characterization of interference mitigation performance. The proposed interference detection method by using a reassigned spectrogram is evaluated by experiments on GPS L1 signals in the disturbing scenarios in comparison to the state-of-the-art TF analysis approaches. The analysis results show that the proposed interference detection technique effectively overcomes the cross-term problem and also keeps good TF localization properties, which has been proven to be valid and effective to enhance the interference Sensors 2015, 15 22168 detection performance; in addition, the adoption of the notch filter in interference mitigation has shown a significant acquisition performance improvement in terms of ROC curves for GNSS receivers in jamming environments. View Full-Text
Keywords: Global Navigation Satellite System (GNSS); interference detection and mitigation; spectrogram; Wigner–Ville distribution (WVD); reassigned method; notch filter Global Navigation Satellite System (GNSS); interference detection and mitigation; spectrogram; Wigner–Ville distribution (WVD); reassigned method; notch filter
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sun, K.; Jin, T.; Yang, D. A New Reassigned Spectrogram Method in Interference Detection for GNSS Receivers. Sensors 2015, 15, 22167-22191.

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