NDLI: Modelling of ionospheric time delay of Global Positioning System (GPS) signals using Taylor series expansion for GPS Aided Geo Augmented Navigation applications

Content Provider	IET Digital Library
Author	Kumar, Perumalla Naveen Sarma, Achanta D. Reddy, Ammana Supraja
Abstract	The positional accuracy of Indian Global Positioning System Aided Geo Augmented Navigation (GAGAN) system is affected by many errors and among them the ionospheric time delay error is the predominant error. The Indian ionosphere is characterised by large gradients, intense irregularities and equatorial anomaly conditions and hence suitable ionospheric model is necessary for GAGAN. Compared with global and regional ionospheric models, not much significant work is reported on local ionospheric models for Indian region. In this study, using Indian Satellite Based Augmentation System data, a local ionospheric model based on Taylor series expansion (TSE) is used. Initially, a network of 17 GAGAN total electron content stations data are considered in the analysis for both quiet and disturbed days. The ionospheric time delay results of the TSE model indicate that the model is performing better for quiet days than the disturbed days. The delay because of the TSE model is compared with that of the delays because of Klobuchar and IRI-2007 models and experimental GAGAN data. The obtained results shows that the TSE model is estimating delay more closely with respect to GAGAN data than that of the Klobuchar and IRI-2007 models and may be considered for use in offline applications.
Starting Page	1081
Ending Page	1090
Page Count	10
ISSN	17518784
Volume Number	8
e-ISSN	17518792
Issue Number	Issue 9, Dec (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/8/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2013.0351
Journal	IET Radar, Sonar & Navigation
Publisher Date	2014-05-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Delay Disturbed Days Equatorial Anomaly Condition Global Ionospheric Model Global Positioning System Global Positioning System Signal GPS Aided Geo Augmented Navigation Application Indian GAGAN System Indian Satellite Based Augmentation System Data Intense Irregularities Ionospheric Technique Ionospheric Time Delay Modelling IRI-2007 Model Klobuchar Model Local Ionospheric Model Offline Application Quiet Days Radio Navigation And Direction Finding Regional Ionospheric Model Series (Mathematics) Taylor Series Expansion Total Electron Content Stations TSE Model
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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