On the occurrence and strength of multi-frequency multi-GNSS Ionospheric Scintillations in Indian sector during declining phase of solar cycle 24

Srinivasu, V.K.D.; Dashora, N.; Prasad, D. S. V. V. D.; Niranjan, K.; Krishna, S. Gopi

doi:10.1016/j.asr.2017.08.036

Cited by 17 publications

(16 citation statements)

References 41 publications

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“…Some jumps were observed on the GLONASS diffTEC curve, which are due to the lesser temporal coverage of GLONASS satellites compared to GPS over WALT. The spatial (in the sense visibility of satellites over a particular time epoch) and temporal coverage of GPS constellation are better than that of the GLONASS constellation over WALT (Srinivasu et al 2017).…”

Section: Response Of Tec During St Patrick's Day Stormmentioning

confidence: 98%

“…Most of them are strong scintillation, and almost all the visible satellites over a site were affected by scintillation. The temporal and spatial coverage of GPS over a station is better than that of GLONASS (Srinivasu et al 2017). Because of this specific reason, higher number of PRNs of GPS was affected by scintillation.…”

Section: L-band Scintillation Of Gps and Glonass Constellationsmentioning

confidence: 99%

“…Fejer et al (2008) have investigated the seasonal dependence of longitudinally averaged equatorial PPEF and disturbance dynamo vertical drifts, and found that the prompt penetration drifts are mostly upward/downward during night-time/daytime in all seasons, respectively. Many researchers have been studying the scintillations on Global Positioning System (GPS) L-band signals during quiet and disturbed periods over Indian sector (Tulasi Ram et al 2008Ramsingh Sripathi et al 2015;Srinivasu et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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L-band scintillation and TEC variations on St. Patrick’s Day storm of 17 March 2015 over Indian longitudes using GPS and GLONASS observations

et al. 2019

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The aim of the present study is to investigate the response of ionospheric total electron content (TEC), Global Positioning System (GPS) and Global Navigation Satellite System (GLONASS) scintillations during 17 March 2015 St. Patrick's Day geomagnetic storm over Visakhapatnam, which is popularly known as Waltair (WALT) in the literature. GPS TEC observations obtained from five IGS stations (SGOC, IISC, HYDE, LCK4 and LHAZ) and WALT during the storm have been compared. The TEC derived from GPS, GLONASS constellations and CODE global ionosphere TEC map (GIM) over WALT has also been compared. Positive storm effect during the main phase of the storm and negative storm effect during the recovery phase of the storm were observed over the said stations. The variation of northern equatorial ionisation anomaly TEC (CODE GIM TEC maps) in response to the St. Patrick's Day storm over four Indian longitudes (75 • E, 80 • E, 85 • E and 90 • E) has also been presented. Strong amplitude and phase scintillations were observed in the L-band signals of GPS and GLONASS constellations over WALT. Twelve satellite (Pseudo Random Noise) PRNs of GPS L1 and nine PRNs of each GLONASS L1 and L2-band signals were affected by strong amplitude and phase scintillation. The peak amplitude scintillation index (S4) obtained from the effected PRNs of GPS L1 signal and GLONASS L1-band signals over WALT range from 0.36 to 0.74 and 0.36 to 0.76, respectively. Strong fluctuations in rate of TEC index are noted over the said stations. This enhanced scintillation activity is mainly due to the main phase of the storm falls in the evening sector over the Indian region.

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Section: Response Of Tec During St Patrick's Day Stormmentioning

confidence: 98%

Section: L-band Scintillation Of Gps and Glonass Constellationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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L-band scintillation and TEC variations on St. Patrick’s Day storm of 17 March 2015 over Indian longitudes using GPS and GLONASS observations

et al. 2019

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“…Due to electromagnetic (EM) wave propagation characteristics, EM waves passing through the earth's atmosphere are affected in many ways [46]. While GNSS signal travel through the wireless channel, the ionosphere introduces frequency dependent delays in the transmitted signal [47], [48]. Ionospheric scintillation causes fading and scattering in the signal which may result in loss of the signal power [49].…”

Section: Physical Degradations In Gnssmentioning

confidence: 99%

“…Ionospheric scintillation causes fading and scattering in the signal which may result in loss of the signal power [49]. The strength of the scintillation is dependent on the solar cycle, space weather and the change of seasons [47], [48], [50], and can virtually be eliminated by applying mathematical calculations in a dual frequency receiver [51].…”

Section: Physical Degradations In Gnssmentioning

confidence: 99%

GNSS Vulnerabilities and Existing Solutions: A Review of the Literature

et al. 2021

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This literature review paper focuses on existing vulnerabilities associated with global navigation satellite systems (GNSSs). With respect to the civilian/non encrypted GNSSs, they are employed for proving positioning, navigation and timing (PNT) solutions across a wide range of industries. Some of these include electric power grids, stock exchange systems, cellular communications, agriculture, unmanned aerial systems and intelligent transportation systems. In this survey paper, physical degradations, existing threats and solutions adopted in academia and industry are presented. In regards to GNSS threats, jamming and spoofing attacks as well as detection techniques adopted in the literature are surveyed and summarized. Also discussed are multipath propagation in GNSS and non line-of-sight (NLoS) detection techniques. The review also identifies and discusses open research areas and techniques which can be investigated for the purpose of enhancing the robustness of GNSS.

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GPS Device Based Equatorial Plasma Bubbles (EPB) Analysis on Radio Wave Propagation Over Low Latitude

Kumar

2020

Springer Proceedings in Physics

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On the occurrence and strength of multi-frequency multi-GNSS Ionospheric Scintillations in Indian sector during declining phase of solar cycle 24

Cited by 17 publications

References 41 publications

L-band scintillation and TEC variations on St. Patrick’s Day storm of 17 March 2015 over Indian longitudes using GPS and GLONASS observations

L-band scintillation and TEC variations on St. Patrick’s Day storm of 17 March 2015 over Indian longitudes using GPS and GLONASS observations

GNSS Vulnerabilities and Existing Solutions: A Review of the Literature

GPS Device Based Equatorial Plasma Bubbles (EPB) Analysis on Radio Wave Propagation Over Low Latitude

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