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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A Novel Approach to Improve GNSS Precise Point Positioning During Strong Ionospheric Scintillation: Theory and Demonstration

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Author(s):
Vani, Bruno Cesar [1, 2] ; Forte, Biagio [3] ; Galera Monico, Joao Francisco [4] ; Skone, Susan [5] ; Shimabukuro, Milton Hirokazu [6] ; Moraes, Alison de Oliveira [7, 8] ; Portella, Igor Ponte [9] ; Marques, Haroldo Antonio [10]
Total Authors: 8
Affiliation:
[1] Sao Paulo State Univ UNESP, Grad Program Cartog Sci, Fac Sci & Technol, Rua Roberto Simonsen 305, BR-19060900 Presidente Prudente - Brazil
[2] Fed Inst Educ Sci & Technol Sao Paulo IFSP, Rua Jose Ramos Jr 2750, BR-19470000 Presidente Epitacio - Brazil
[3] Univ Bath, Dept Elect & Elect Engn, Bath BA2 7AY, Avon - England
[4] Sao Paulo State Univ UNESP, Dept Cartog, Fac Sci & Technol, Rua Roberto Simonsen 305, BR-19060900 Presidente Prudente - Brazil
[5] Univ Calgary, Dept Geomat Engn, Calgary, AB T2N 1N4 - Canada
[6] Sao Paulo State Univ UNESP, Dept Math & Comp Sci, Fac Sci & Technol, Rua Roberto Simonsen 305, BR-19060900 Presidente Prudente - Brazil
[7] IAE, Praca Marechal Eduardo Gomes, BR-12228900 Sao Jose Dos Campos - Brazil
[8] ITA, Praca Marechal Eduardo Gomes, BR-12228900 Sao Jose Dos Campos - Brazil
[9] ITA, Praca Marechal Eduardo Gomes 50, Sao Jose Dos Campos - Brazil
[10] Mil Engn Inst IME, Praca Gen Tiburcio 80, BR-22290270 Rio De Janeiro - Brazil
Total Affiliations: 10
Document type: Journal article
Source: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY; v. 68, n. 5, p. 4391-4403, MAY 2019.
Web of Science Citations: 0
Abstract

At equatorial latitudes, ionospheric scintillation is the major limitation in achieving high-accuracy GNSS positioning. This is because scintillation affects the tracking ability of GNSS receivers causing losses of lock and degradation on code pseudo-range and carrier phase measurements, thus degrading accuracy. During strong ionospheric scintillation, such effects are more severe and GNSS users cannot rely on the integrity, reliability, and availability required for safety-critical applications. In this paper, we propose a novel approach able to greatly reduce these effects of scintillation on precise point positioning (PPP). Our new approach consists of three steps: 1) a new functional model that corrects the effects of range errors in the observables; 2) a new stochastic model that uses these corrections to generate more accurate positioning; and 3) a new strategy to attenuate the effects of losses of lock and consequent ambiguities re-initializations that are caused by the need to re-initialize the tracking. We demonstrate the effectiveness of our method in an experiment using a 30-day static dataset affected by different levels of scintillation in the Brazilian southeastern region. Even with limitations imposed by data gaps, our results demonstrate improvements of up to 80% in the positioning accuracy. We show that, in the best cases, our method can completely negate the effects of ionospheric scintillation and can recover the original PPP accuracy that would have existed without any scintillation. The significance of this paper lies in the improvement it offers in the integrity, reliability, and availability of GNSS services and applications. (AU)

FAPESP's process: 06/04008-2 - GNSS: investigations and applications in geodetic positioning, in studies related to the atmosphere and precision agriculture
Grantee:Joao Francisco Galera Monico
Support type: Research Projects - Thematic Grants