A novel approach to improve GNSS Precise Point Positioning during strong ionospheric scintillation: theory and demonstration

Bruno C. Vani, Biagio Forte, João F. G. Monico, Susan Skone, Milton Hirokazu Shimabukuro, Alison de O. Moraes, I. P. Portella, H. A. Marques

Research output: Contribution to journalArticle

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 pseudorange 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: a) a new functional model that corrects the effects of range errors in the observables; b) a new stochastic model that uses these corrections to generate more accurate positioning; and c) 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 south-eastern 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 work lies in the improvement it offers in the integrity, reliability and availability of GNSS services and applications.
LanguageEnglish
JournalIEEE Transactions on Vehicular Technology
DOIs
StatusPublished - 8 Mar 2019

Cite this

A novel approach to improve GNSS Precise Point Positioning during strong ionospheric scintillation : theory and demonstration. / Vani, Bruno C.; Forte, Biagio; Monico, João F. G. ; Skone, Susan; Shimabukuro, Milton Hirokazu ; de O. Moraes, Alison; Portella, I. P.; Marques, H. A.

In: IEEE Transactions on Vehicular Technology, 08.03.2019.

Research output: Contribution to journalArticle

Vani, Bruno C. ; Forte, Biagio ; Monico, João F. G. ; Skone, Susan ; Shimabukuro, Milton Hirokazu ; de O. Moraes, Alison ; Portella, I. P. ; Marques, H. A. / A novel approach to improve GNSS Precise Point Positioning during strong ionospheric scintillation : theory and demonstration. In: IEEE Transactions on Vehicular Technology. 2019.
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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 pseudorange 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: a) a new functional model that corrects the effects of range errors in the observables; b) a new stochastic model that uses these corrections to generate more accurate positioning; and c) 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 south-eastern 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 work lies in the improvement it offers in the integrity, reliability and availability of GNSS services and applications.",
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AU - Monico, João F. G.

AU - Skone, Susan

AU - Shimabukuro, Milton Hirokazu

AU - de O. Moraes, Alison

AU - Portella, I. P.

AU - Marques, H. A.

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AB - 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 pseudorange 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: a) a new functional model that corrects the effects of range errors in the observables; b) a new stochastic model that uses these corrections to generate more accurate positioning; and c) 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 south-eastern 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 work lies in the improvement it offers in the integrity, reliability and availability of GNSS services and applications.

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