Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System
TLDR
S-band signals of NAVIC are used for the first time to investigate ionospheric gradients over low-latitude region and it is evident that RLS model can estimate ionospherical gradients for a single NAVIC station.Abstract:
Navigation with Indian constellation (NAVIC) is the operational name given to the Indian Regional Navigation Satellite System developed by the Indian Space Research Organisation, India. The most influential factor is ionospheric gradients that can degrade the positional accuracy of the global navigation satellite system users especially in low-latitude regions. The main aim of this paper is to estimate the ionospheric gradient variations obtained from the NAVIC receiver located at Guntur, India (16.23° N, 80.44° E). Code and carrier phase measurements of S-band (2492.028 MHz) signals are used to derive ionospheric time delays and total electron content (TEC) values. In this paper, S-band signals of NAVIC are used for the first time to investigate ionospheric gradients over low-latitude region. The recursive least squares (RLS) algorithm is implemented as a single frequency ionospheric model for estimating the absolute TEC, and longitudinal (E–W) and latitudinal (N–S) ionospheric gradients. Ionospheric gradient analysis has been carried for three consecutive days during September equinox, December solstice in 2016, and for a geomagnetic disturbed event observed during May 2017. The annual statistical analysis in the periodic structure of spatial ionospheric gradients from NAVIC S-band signals during June 2016–May 2017 is also discussed. It is evident that RLS model can estimate ionospheric gradients for a single NAVIC station. The outcome of this work would be useful for understanding ionospheric irregularities climatology over low-latitude region.read more
Citations
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Development and Evaluation of Near‐Real Time TEC and Ancillary Products for SANSA Space Weather
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Post-sunset Scintillation on NavIC Signals during Equinoctial Periods of 2021-2022
TL;DR: In this article , the authors present the results of moderate to intense post-sunset scintillation cases during the autumn equinox of 2021 and vernal Equinox 2022 at NavIC signals in the L5 band and S-band.
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Post-sunset Scintillation on NavIC Signals during Equinoctial Periods of 2021-2022
TL;DR: In this paper , the results of moderate to intense post-sunset scintillation cases during the autumn equinox of 2021 and thevernal Equinox 2022 at NavIC signals in the L5 band and S-band were presented.
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Advantage of IRNSS S-band signal for GBAS applications in adverse ionospheric storm conditions
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Ionospheric correction of S-band tracking radar data using NavIC S-band signals in missile test range applications
TL;DR: In this article , a novel experimental technique to improve the tracking accuracy of S-band radars using the concurrent NavIC Sband signal is presented, which is validated using data from a missile test mission.
References
More filters
Book
Adaptive Filter Theory
TL;DR: In this paper, the authors propose a recursive least square adaptive filter (RLF) based on the Kalman filter, which is used as the unifying base for RLS Filters.
Journal ArticleDOI
Ionospheric Time-Delay Algorithm for Single-Frequency GPS Users
TL;DR: The algorithm designed for this purpose, and implemented in the GPS satellites, requires only eight coefficients sent as part of the satellite message, and contains numerous approximations designed to reduce user computational requirements, yet preserves the essential elements required to obtaingroup delay values along multiple satellite viewing directions.
Journal ArticleDOI
A strong positive phase of ionospheric storms observed by the Millstone Hill incoherent scatter radar and global GPS network
Chao Song Huang,John C. Foster,Larisa Petrovna Goncharenko,Philip J. Erickson,William C. Rideout,Anthea J. Coster +5 more
TL;DR: In this paper, the authors present observations of a strong positive storm at middle latitudes and suggest that electric fields may play an important role in the generation of the observed positive storm phase.
Robust Detection of Ionospheric Irregularities
Todd Walter,Andrew J. Hansen,Juan Blanch,Per Enge,Tony Mannucci,Xiaoqing Pi,Larry Sparks,Byron Iijima,Bakry El-Arini,Roland Lejeune,Mine Hagen,Eric Altshuler,Rob Fries,Aleck Chu +13 more
TL;DR: The Wide Area Augmentation System (WAAS) as mentioned in this paper provides real-time differential GPS corrections and integrity information for aircraft navigation use, where the system guides the aircraft to within a few hundred feet of the ground.
Journal ArticleDOI
A quantitative study of ionospheric density gradients at midlatitudes
H. B. Vo,J. C. Foster +1 more
TL;DR: In this article, the authors used the Millstone Hill incoherent scatter radar database to investigate the spatial extent and temporal evolution of TEC and density altitude/latitude structure at middle and subauroral latitudes as a function of solar cycle, local time, and level of geomagnetic activity.