Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System
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 naviga...
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doaj-f9cd39634214456dbaa9a0b19645e7132021-03-29T20:26:57ZengIEEEIEEE Access2169-35362018-01-016669546696210.1109/ACCESS.2018.28767958528344Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC SystemD. Venkata Ratnam0https://orcid.org/0000-0003-2222-2117T. Raghavendra Vishnu1P. Babu Sree Harsha2Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Guntur, IndiaDepartment of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Guntur, IndiaDepartment of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Guntur, IndiaNavigation 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.https://ieeexplore.ieee.org/document/8528344/GradientsionosphereNAVICrecursive least squares (RLS)TEC |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. Venkata Ratnam T. Raghavendra Vishnu P. Babu Sree Harsha |
spellingShingle |
D. Venkata Ratnam T. Raghavendra Vishnu P. Babu Sree Harsha Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System IEEE Access Gradients ionosphere NAVIC recursive least squares (RLS) TEC |
author_facet |
D. Venkata Ratnam T. Raghavendra Vishnu P. Babu Sree Harsha |
author_sort |
D. Venkata Ratnam |
title |
Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System |
title_short |
Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System |
title_full |
Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System |
title_fullStr |
Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System |
title_full_unstemmed |
Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System |
title_sort |
ionospheric gradients estimation and analysis of s-band navigation signals for navic system |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2018-01-01 |
description |
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. |
topic |
Gradients ionosphere NAVIC recursive least squares (RLS) TEC |
url |
https://ieeexplore.ieee.org/document/8528344/ |
work_keys_str_mv |
AT dvenkataratnam ionosphericgradientsestimationandanalysisofsbandnavigationsignalsfornavicsystem AT traghavendravishnu ionosphericgradientsestimationandanalysisofsbandnavigationsignalsfornavicsystem AT pbabusreeharsha ionosphericgradientsestimationandanalysisofsbandnavigationsignalsfornavicsystem |
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