Robust GNSS Triple-Carrier Joint Estimations Under Strong Ionosphere Scintillation

Yang, Rong; Zhan, Xingqun; Huang, Jihong

doi:10.1007/978-981-15-3707-3_53

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…Based on the previous analysis, we intend to use the multi-frequency tracking (MT) algorithm to perform interfrequency aiding from uncompensated signals to the interfered signals and mitigate the strong amplitude attenuations. This MT algorithm has been investigated in our recent work [17,18]. Therefore, only a brief summary is presented here.…”

Section: Multipath Mitigationmentioning

confidence: 99%

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Characterization and mitigation of multipath fading on multi-frequency GNSS signals in urban environment

Yang

Zhan

Huang

2020

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The global navigation satellite systems (GNSS) receiver is likely to experience performance degradation in the presence of multipath interferences in indoor and urban canyon environments. There will be multiple reflected signals arriving at the receiver antenna from different paths and directions regarding the different locations of the nearby constructions, causing significant fluctuations and distortions on the amplitude and phase of the direct signals. This is the so-called multipath fading effects and usually exhibit with the random features of temporal, spatial, and frequency diversity across the signal bands. To have a better understanding of the multipath fading effects, a live test was conducted near Lujiazui CBD area in Shanghai. The collected data were processed to characterize the signal attenuations and phase fluctuations on multi-frequency GNSS signals via the detrend code delay, carrier phase, and navigation bit errors. The resulting scintillation index on amplitude, code delay, and carrier phase, e.g., S 4 , σ ϕ and σ τ can be calculated. Based on these multipath features, the inter-frequency aiding strategy will be utilized for the multipath mitigations in the multi-frequency tracking loop design. The results demonstrate the effectiveness of the multi-frequency tracking algorithm in the urban environment.

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Section: Multipath Mitigationmentioning

confidence: 99%

“…This is the fundamental of MT algorithm design. More details can be found in Yang [17,18]. In this study, we alter the MT algorithm to a dual-frequency tracking version for L1 and L5 joint tracking due to the hardware issues on L2.…”

Section: Multipath Mitigationmentioning

confidence: 99%

Characterization and mitigation of multipath fading on multi-frequency GNSS signals in urban environment

Yang

Zhan

Huang

2020

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“…Our goal is to analyze the disturbance characteristics of the ionosphere at different latitudes and longitudes in this event using ground-based and space-based data. On the one hand, our analysis is helpful to reveal the physical mechanism of the ionospheric disturbances, which can interfere with the satellite navigation and communication systems, e.g., the Global Navigation Satellite System (GNSS) [10]. On the other hand, ionospheric delay correction is a key factor to improve the accuracy of GNSS positioning, and TEC is closely related to the time delay of ionospheric radio wave propagation, so it can be used for radio wave propagation correction in satellite positioning and navigation.…”

Section: Introductionmentioning

confidence: 99%

An analysis of global ionospheric disturbances and scintillations during the strong magnetic storm in September 2017

Song

Yang

Zhan

2020

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Severe space weather events, e.g., solar flares and magnetic storm, can cause significant disturbances to the global ionosphere. The radio frequency signals, such as wireless communications and global satellite navigation system (GNSS) signals, often experience strong scintillations when traveling through the disturbed ionosphere layer. On 6 September 2017, the sun emitted the largest solar flare classified X9.3 since the 24th solar activity week. It triggered the geomagnetic storm and ionospheric storm on September 8, causing severe disturbances and scintillations of ionospheric. In this work, we take this event as the objective to investigate the characteristics of the ionosphere disturbance. First, the temporal and spatial distributions of ionospheric total electron content (TEC) are analyzed using the ground-based IGS data. The change of TEC is highly correlated with that of the geomagnetic indices and the magnetic storm has the greatest impact on low latitudes. Then, a fivepoint moving average method is adopted to extract the spatial fluctuations based on post-processed electron density and TEC data from COSMIC and GRACE missions. We find they show different disturbance characteristics in spatial distribution. In addition, the GNSS amplitude scintillation index S4 which is available from the COSMIC satellite mission is used to characterize ionospheric scintillation during this event. Weak scintillation occurred in most parts of the world on September 8 2017, while moderate scintillation is mainly concentrated around 120°W and 100°E. Our study can provide a basis for better evaluating the impact of ionosphere disturbance changes on satellite communication and navigation in space weather events.

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Robust GNSS Triple-Carrier Joint Estimations Under Strong Ionosphere Scintillation

Cited by 2 publications

References 15 publications

Characterization and mitigation of multipath fading on multi-frequency GNSS signals in urban environment

Characterization and mitigation of multipath fading on multi-frequency GNSS signals in urban environment

An analysis of global ionospheric disturbances and scintillations during the strong magnetic storm in September 2017

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