NDLI: Least-squares collocation modelling of regional ionospheric TEC for accelerating real-time single-frequency PPP convergence

Content Provider	IET Digital Library
Author	Gong, Yangzhao Cai, Changsheng Dai, Wujiao Zhu, Jianjun
Abstract	Modelling of the regional ionospheric total electron content (TEC) is an important means for mitigating the ionospheric delay errors in the single-frequency (SF) precise point positioning (PPP). Mostly, the existing regional ionospheric models (RIM) only takes the trend term of the ionospheric TEC variations into account and neglect their random variable part. As a result, the TEC's irregular variations cannot be well modelled. In this study, a regional ionospheric TEC model based on the least-squares collocation (LSC) approach is proposed to account for both the trend and random parts. The predicted TEC from the LSC RIM is then employed in the real-time (RT) SF PPP for speeding up convergence. Datasets collected in two different latitude regions are utilised to establish the LSC RIM with a comparison to the conventional polynomial model and the global ionosphere map (GIM)-predicted products. The results show that the LSC model can remove ionospheric delay errors of at least 92%, which is larger than the polynomial model and GIM products. Further, the GPS RT SF PPP after introducing the predicted TEC from the LSC RIM can significantly reduce the convergence time by at least 48%, 58%, and 5% in the east, north, and up directions.
Starting Page	1031
Ending Page	1038
Page Count	8
ISSN	17518784
Volume Number	13
e-ISSN	17518792
Issue Number	Issue 6, Jun (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/13/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2018.5504
Journal	IET Radar, Sonar & Navigation
Publisher Date	2019-02-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Atmospheric/ionospheric/magnetospheric Technique And Equipment Conventional Polynomial Model Convergence Time Different Latitude Regions Existing Regional Ionospheric Model GGlobal Ionosphere Map-predicted Product GIM-predicted Product Global Positioning System GPS RT SF PPP Instrumentation And Technique For Aeronomy, Space Physics, And Cosmic Rays Ionosphere Ionospheric Delay Error Ionospheric Electromagnetic Wave Propagation Ionospheric Structure Ionospheric TEC Variations Ionospheric Technique Least-squares Collocation Approach Low Latitude Region LSC Model LSC RIM Middle Latitude Region Polynomial Predicted TEC Radio Navigation And Direction Finding Radio Wave Propagation Random Variable Part Real-time SF PPP Real-time Single-frequency PPP Convergence Regional Ionospheric TEC Model Regional Ionospheric Total Electron Content Satellite Communication System Single-frequency Precise Point Positioning Squares Collocation Modelling TEC's Irregular Variations Total Electron Content (atmosphere)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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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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