Journal ArticleDOI
Impact of multiconstellation satellite signal reception on performance of satellite‐based navigation under adverse ionospheric conditions
Ashik Paul,K. S. Paul,A. Das +2 more
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TLDR
In this paper, the authors showed increased availability of GPS, GLONASS and GALILEO from Calcutta compared to GPS-only scenario and estimates intense scintillation-free (S4, < 0.6) satellite vehicle look angles at different hours of the post-sunset period 19:00-01:00LT during March 2014.Abstract:
Application of multi-constellation satellites to address the issue of satellite signal outages during periods of equatorial ionospheric scintillations could prove to be an effective tool for maintaining the performance of satellite-based communication and navigation without compromise in accuracy and integrity. A receiver capable of tracking GPS, GLONASS and GALILEO satellites is operational at the Institute of Radio Physics and Electronics, University of Calcutta, Calcutta, India located near the northern crest of the Equatorial Ionization Anomaly (EIA) in the Indian longitude sector. The present paper shows increased availability of satellites combining GPS, GLONASS and GALILEO constellations from Calcutta compared to GPS-only scenario and estimates intense scintillation-free (S4 < 0.6) satellite vehicle look angles at different hours of the post-sunset period 19:00-01:00LT during March 2014. A representative case of March 1, 2014 is highlighted in the paper and overall statistics for March 2014 presented to indicate quantitative advantages in terms of scintillation-free satellite vehicle look angles that may be utilized for planning communication and navigation channel spatial distribution under adverse ionospheric conditions. Number of satellites tracked and receiver position deviations has been found to show a good correspondence with the occurrence of intense scintillations and poor user receiver-satellite link geometry. The ground projection of the 350-km subionospheric points corresponding to multi-constellation shows extended spatial coverage during periods of scintillations (0.2 < S4 < 0.6) compared to GPS.read more
Citations
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Relative entropy-based Kalman filter for seamless indoor/outdoor multi-source fusion positioning with INS/TC-OFDM/GNSS
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Degradation of Satellite‐Based Navigation Performance Observed From an Anomaly Crest Location in the Indian Longitude Sector
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Study of Relative Performance of Different Navigational Satellite Constellations Under Adverse Ionospheric Conditions
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The Effects of Ionospheric Irregularities on the Navigational Receivers and Its Mitigation
TL;DR: The paper suggests the use of adaptive software-based receiver model or modified hardware receivers to mitigate the effects of amplitude and phase fluctuations due to irregular ionosphere.
References
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Journal ArticleDOI
A proposed index for measuring ionospheric scintillation
Herbert E. Whitney,Chester Malik +1 more
TL;DR: In this paper, a simplified method of scaling scintillation index is described, and the accuracy of the simplified method is determined by a comparison with measurements of SCI by machine computation.
Journal ArticleDOI
Comparison of the effect of high-latitude and equatorial ionospheric scintillation on GPS signals during the maximum of solar cycle 24
TL;DR: In this paper, the authors compared the characteristics of high-latitude and equatorial scintillation using multifrequency GPS data collected at Gakona, Alaska, Jicamarca, Peru, and Ascension Island during the 24th solar maximum.
Journal ArticleDOI
Data-Driven Testbed for Evaluating GPS Carrier Tracking Loops in Ionospheric Scintillation
TL;DR: Testbed results indicate that cycle slips are primarily caused by the abrupt, near half-cycle phase changes that occur during the deep power fades of severe equatorial scintillation.
Journal ArticleDOI
Future Dual-Frequency GPS Navigation System for Intelligent Air Transportation Under Strong Ionospheric Scintillation
Jiwon Seo,Todd Walter +1 more
TL;DR: This paper investigates a possible improvement in the availability of GPS-based aircraft landing guidance down to 200 ft above the runway, which is also known as Localizer Performance with Vertical Guidance (LPV) 200, under strong ionospheric scintillation when dual-frequency signals are available.
Temporal Decorrelation of GPS Satellite Signals due to Multiple Scattering from Ionospheric Irregularities
TL;DR: In this article, the authors explored the relationship between the ionospheric scintillation parameters, loss of lock, and signal reacquisition time and provided empirical fits to the probability of losing lock for use in modeling and simulation studies.