Tackling ionospheric scintillation threat to GNSS in Latin America

Veettil, Sreeja Vadakke; Aquino, Márcio; Forte, Biagio; Elmas, Zeynep; Hancock, Craig M.; Franceschi, Giorgiana De; Alfonsi, Lucilla; Spogli, Luca; Romano, Vincenzo; Bougard, Bruno; Monico, J. F. Galera; Wernik, A. W.; Sleewaegen, Jean-Marie; Canto, Andrea; Silva, Elcia Ferreira Da

doi:10.1051/swsc/2011005

Cited by 30 publications

(23 citation statements)

References 26 publications

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“…Up to now, almost all studies of GNSS scintillations focused exclusively on the GPS L1 frequency Béniguel et al (2009), SBAS Ionospheric Working Group (2010), Sreeja et al (2011), Adewale et al (2012), Paznukhov et al (2012) with few authors considering GPS L2 and L5 Conker et al (2003), Carrano et al (2012), Shanmugam et al (2012) and GLONASS L1, L2 Sreeja et al (2012). To broaden this scope, we present results that compare the influence of scintillations on the new signals to GPS L1.…”

Section: Introductionmentioning

confidence: 99%

Scintillations of the GPS, GLONASS, and Galileo signals at equatorial latitude

Hlubek

Berdermann

Wilken

et al. 2014

J. Space Weather Space Clim.

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Small scale ionospheric disturbances can lead to fluctuations of the received satellite signal, so-called signal scintillations. For global navigation satellite systems (GNSS) this reduces the positioning accuracy. Particular strong events can even lead to a loss of lock between satellite and receiver. All GNSS signals are affected by this phenomenon. The influence of the short scale disturbances on the different GNSS signals is expected to be different for each signal, since the signals are transmitted by different carrier frequencies and are constructed in different ways. In this paper, we compare the occurrence rate of signal scintillations between the different global navigation satellite systems and their different signal frequencies. In particular, we consider GPS L1, L2, and L5, GLONASS L1 and L2, and Galileo E1 and E5a. This analysis uses data from a high-rate GNSS station of the German Aerospace Center (DLR) placed in Bahir Dar, Ethiopia at 11°36 0 N 37°23 0 E. The station collects 50 Hz raw data from which the amplitude scintillation index S 4 is calculated. The data has been collected for the whole year 2013. Since the number of strong scintillation events with S 4 > 0.5 was smaller than expected, additionally weak scintillation events with S 4 ! 0.25 are taken into account. An algorithm is used that provides a soft barrier for S 4 ! 0.25. The resulting events are shown as daily and seasonal averages. Finally, the overall influence of short scale ionospheric disturbances in the form of signal scintillations on the GNSS signals is estimated.

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Section: Introductionmentioning

confidence: 99%

Scintillations of the GPS, GLONASS, and Galileo signals at equatorial latitude

Hlubek

Berdermann

Wilken

et al. 2014

J. Space Weather Space Clim.

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“…Analyses presented in Sreeja et al (2011a) show that the scintillation indices recorded by the two receivers are comparable. In this study, the 60-s SigmaPhi (Phi60) values were used.…”

Section: Ionospheric Effects On Gnss Receiver Performancementioning

confidence: 82%

Impact and mitigation of space weather effects on GNSS receiver performance

Sreeja

2016

Geosci. Lett.

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It is well known that Global Navigation Satellite System (GNSS) signals suffer from a number of vulnerabilities, out of which a potential severe vulnerability is the effect of space weather. Space weather effects on the signals transmitted by GNSS include the effect of ionospheric perturbations and solar radio bursts. Intense solar radio bursts occurring in the L-band can impact the tracking performance of GNSS receivers located in the sunlit hemisphere of the Earth and are therefore a potential threat to safety-critical systems based on GNSS. Consequently monitoring these events is important for suitable warnings to be issued in support to related services and applications. On the other hand, the space weather effects leading to ionospheric perturbations on the GNSS signals are either due to dispersion or scintillation caused by plasma density irregularities. Scintillation can cause cycle slips and degrade the positioning accuracy in GNSS receivers. The high-latitude scintillation occurrence is known to correlate with changes in the solar and interplanetary conditions along with a consequential impact on GNSS receiver tracking performance. An assessment of the GNSS receiver tracking performance under scintillation can be analysed through the construction of receiver phase-locked loop (PLL) tracking jitter maps. These maps can offer a potentially useful tool to provide users with the prevailing tracking conditions under scintillation over a certain area and also be used to help mitigate the effects of scintillation on GNSS positioning. This paper reviews some of recent research results related to the impact and mitigation of space weather effects on GNSS receiver performance.

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“…The input data to the WAM model are DE2 (Dynamic Explorer 2) retarding potential analyser (RPA) measurements of the ion density. The new version of WAM will reproduce statistically well the climatology of scintillations on a diurnal and seasonal basis as obtained by comparing WAM output with experimental data from the CIGALA network (Sreeja et al 2011). Its limitations when used as a prediction model for specific satellite-receiver links are however apparent and need deeper investigations.…”

Section: Forecasting Ionospheric Behaviourmentioning

confidence: 84%

“…A very promising investigation in this sense has been recently made in the frame of the CIGALA FP7-Project (Sreeja et al 2011): the WAM model (Wernik et al 2007), previously developed at high latitude, and has been tuned to model the equatorial scintillation scenario in the Latin American longitudinal sector to support the improvement of tracking models. The input data to the WAM model are DE2 (Dynamic Explorer 2) retarding potential analyser (RPA) measurements of the ion density.…”

Section: Forecasting Ionospheric Behaviourmentioning

confidence: 99%

Monitoring, tracking and forecasting ionospheric perturbations using GNSS techniques

Jakowski

Béniguel

Franceschi

et al. 2012

J. Space Weather Space Clim.

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The paper reviews the current state of GNSS-based detection, monitoring and forecasting of ionospheric perturbations in Europe in relation to the COST action ES0803 ''Developing Space Weather Products and Services in Europe''. Space weather research and related ionospheric studies require broad international collaboration in sharing databases, developing analysis software and models and providing services. Reviewed is the European GNSS data basis including ionospheric services providing derived data products such as the Total Electron Content (TEC) and radio scintillation indices. Fundamental ionospheric perturbation phenomena covering quite different scales in time and space are discussed in the light of recent achievements in GNSS-based ionospheric monitoring. Thus, large-scale perturbation processes characterized by moving ionization fronts, wave-like travelling ionospheric disturbances and finally small-scale irregularities causing radio scintillations are considered. Whereas ground and space-based GNSS monitoring techniques are well developed, forecasting of ionospheric perturbations needs much more work to become attractive for users who might be interested in condensed information on the perturbation degree of the ionosphere by robust indices. Finally, we have briefly presented a few samples illustrating the space weather impact on GNSS applications thus encouraging the scientific community to enhance space weather research in upcoming years.

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Tackling ionospheric scintillation threat to GNSS in Latin America

Cited by 30 publications

References 26 publications

Scintillations of the GPS, GLONASS, and Galileo signals at equatorial latitude

Scintillations of the GPS, GLONASS, and Galileo signals at equatorial latitude

Impact and mitigation of space weather effects on GNSS receiver performance

Monitoring, tracking and forecasting ionospheric perturbations using GNSS techniques

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