Improved precise point positioning in the presence of ionospheric scintillation

Zhang, Xiaohong; Guo, Fei; Zhou, Peiyuan

doi:10.1007/s10291-012-0309-1

Cited by 59 publications

(59 citation statements)

References 13 publications

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“…This makes it one of the most difficult situations to detect CSs reliably. To solve the CSs detection failures under disturbed ionospheric conditions, a variety of procedures have been proposed in recent years [ Banville and Langley , ; Cai et al , ; Ji et al , ; Zhang et al , ], but we ignore if they are able to solve extreme and combined events like the one studied in this work which still can induce errors in PPP. It is noteworthy that in this paper we analyze data with 30 s sampling rate and that considering higher rate (e.g., 1 s) would prevent the SITEC related problems in the CS detection.…”

Section: Discussionmentioning

confidence: 99%

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

et al. 2015

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Intense disturbances in the ionosphere may produce perturbations in Global Navigation Satellite Systems (GNSS) radio signals that in the most severe cases produce receiver tracking problems, which in turn impact on GNSS positioning accuracy. In this paper we present a case study related to the sudden increase in total electron content (SITEC) induced by the X17.2 solar flare that occurred on 28 October 2003. This is the largest SITEC ever recorded by means of the rate of change of total electron content. A solar radio burst (SRB) occurred in the same period which caused GNSS signal fading and in some cases complete signal loss. Although SITEC contribution to the signal noise cannot be separated from that of SRB, in this paper we show that accuracy degradation may happen in kinematic precise point positioning (PPP) in several stations of the sunlit hemisphere when 30 s sampling rate data are analyzed. The observed errors in the position are the result of the difficulties that cycle slip (CS) detection strategies have to deal with the observables that have been affected by the SITEC.

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Section: Discussionmentioning

confidence: 99%

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

et al. 2015

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“…Consequently, a new convergence period is required for such parameter and the accuracy of the positioning may deteriorate. Another source of deterioration in positioning accuracy is the sudden change in geometry caused by losses of lock during scintillation, as highlighted by Zhang et al (2014). The detection, identification and adaption (DIA) method (Teunissen 1998) is applied for outlier detection and quality control adjustment.…”

Section: Alignment and Positioningmentioning

confidence: 99%

GPS availability and positioning issues when the signal paths are aligned with ionospheric plasma bubbles

et al. 2018

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The propagation paths of signals through equatorial ionospheric irregularities are analyzed by evaluating their effects on Global Navigation Satellite System (GNSS) positioning and availability. Based on observations during 32 days by a scintillation monitor at São José dos Campos, Brazil, it was noted that there is a dominance of enhanced scintillation events for Global Positioning System (GPS) ray paths aligned with the azimuth angle of 345° (geographic northwest). This azimuth corresponds to the magnetic meridian that has a large westward declination angle in the region (21.4ºW). Such results suggest that the enhanced scintillation events were associated with GPS signals that propagated through plasma bubbles aligned along the direction of the magnetic field. It will be shown that, under this alignment condition, the longer propagation path length through plasma bubbles can result in more severe scintillation cases and more losses of signal lock, as supported by proposed statistics of bit error probability and mean time between cycle slips. Additionally, large precise positioning errors are also related to these events, as demonstrated by precise point positioning experiments.

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“…In this manuscript, satellite exclusion approaches are not considered, instead the intention is to model the effects of scintillation considering all the satellites tracked by the receiver, therefore ensuring the strongest possible satellite geometry. A third approach is based on improving the data processing algorithm such as by providing a more realistic stochastic model (Aquino et al 2009;Silva et al 2010;Weng et al 2014), a robust iterative Kalman filter combined with data snooping for further quality control (Zhang et al 2014) and an advanced stochastic model coupled with suitable total electron content (TEC) information (Park et al 2017). Vani et al (2019) described a scintillation mitigation approach consisting of three steps, namely a new functional model to correct the effects of range errors in the observables, a new stochastic model that uses these corrections to assign different precisions for the observables and a strategy to attenuate the effects of losses of lock and consequent ambiguities re-initializations.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of ionospheric scintillation effects on GNSS precise point positioning (PPP) at low latitudes

Veettil

Aquino

Marques

et al. 2020

J Geod

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Global navigation satellite systems (GNSS) underpin a number of modern life activities, including applications demanding positioning accuracy at the level of centimetres, such as precision agriculture, offshore operations and mining, to name a few. Precise point positioning (PPP) exploits the precision of the GNSS signal carrier phase measurements and may be used to provide the high accuracy positioning needed by these applications. The Earth's ionosphere is critical in PPP due to its high variability and to disturbances such as scintillation, which can affect the satellite signals propagation and thereby degrade the positioning accuracy, especially at low latitudes, where severe scintillation frequently occurs. This manuscript presents results from a case study carried out at two low latitude stations in Brazil, where a dedicated technique is successfully applied to mitigate the scintillation effects on PPP. The proposed scintillation mitigation technique improves the least square stochastic model used for position computation by assigning satellite and epoch specific weights based on the signal tracking error variances. The study demonstrates that improvements in the 3D positioning error of around 62-75% can be achieved when applying this technique under strong scintillation conditions. The significance of the results lies in the fact that this technique can be incorporated in PPP to achieve the required high accuracy in real time and thus improve the reliability of GNSS positioning in support of high accuracy demanding applications.

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Improved precise point positioning in the presence of ionospheric scintillation

Cited by 59 publications

References 13 publications

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

Precise point positioning performance in the presence of the 28 October 2003 sudden increase in total electron content

GPS availability and positioning issues when the signal paths are aligned with ionospheric plasma bubbles

Mitigation of ionospheric scintillation effects on GNSS precise point positioning (PPP) at low latitudes

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