Ionospheric response to extreme events and its effects on precise point positioning

Alçay, Salih

doi:10.1007/s12648-022-02343-x

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Jacobsen [30,31] found that network RTK positioning errors during magnetic storms increase exponentially with the rate of change of ionospheric electron content and that the positioning performance of the PPP technique is severely affected during magnetic storms. Alcay and Poniatowski [32,33] studied several geomagnetic storm events. They found that the error in dynamic precision single-point localization during the storms increased significantly relative to the quiet periods, and the more violent the fluctuations in the total electron content of the electron layer, the greater the loss of precision.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic storm events affect the positioning accuracy of satellite navigation systems and the orbiting accuracy of low-orbit satellites to a certain extent [34][35][36]. If the magnetic storm event level is significant, the satellite signals may even be interrupted [12,33,37]. To minimize the impact of the severe space weather environment on GNSS positioning performance during unexpected solar activity events.…”

Section: Introductionmentioning

confidence: 99%

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Initial Study of Adaptive Threshold Cycle Slip Detection on BDS/GPS Kinematic Precise Point Positioning during Geomagnetic Storms

Su,

Zeng,

Zhou

et al. 2024

Remote Sensing

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Global navigation satellite system (GNSS) provides users with all-weather, continuous, high-precision positioning, navigation, and timing (PNT) services. In the operation and use of GNSS, the influence of the space environment is a factor that must be considered. For example, during geomagnetic storms, a series of changes in the Earth’s magnetosphere, ionosphere, and upper atmosphere affect GNSS’s positioning performance. To investigate the positioning performance of global satellite navigation systems during geomagnetic storms, this study selected three geomagnetic storm events that occurred from September to December 2023. Utilizing the global positioning system (GPS)/Beidou navigation satellite system (BDS) dual-system, kinematic precise point positioning (PPP) experiments were conducted, and the raw observational data from 100 stations worldwide was analyzed. The experimental results show that the positioning accuracy of some stations in high-latitude areas decreases significantly when using the conventional Geometry Free (GF) cycle-slip detection threshold during geomagnetic storms, which means that the GF is no longer applicable to high-precision positioning services. Meanwhile, there is no significant change in the satellite signal strengths received at the stations during the period of the decrease in positioning accuracy. Analyzing the cycle-slip rates for stations where abnormal accuracy occurred, it was observed that stations experiencing a significant decline in positioning accuracy exhibited serious cycle-slip misjudgments. To improve the kinematic PPP accuracy during magnetic storms, this paper proposes an adaptive threshold for cycle-slip detection and designs five experimental strategies. After using the GF adaptive threshold, the station positioning accuracy improved significantly. It achieved the accuracy level of the quiet period, while the cycle-slip incidence reached the average level. During magnetic storms, the ionosphere changes rapidly, and the use of the traditional GF constant threshold will cause serious cycle-slip misjudgments, which makes the dynamic accuracy in high latitude areas and some mid-latitude areas uncommon, while the use of the GF adaptive threshold can alleviate this phenomenon and improve the positioning accuracy in the high-latitude regions and some of the affected mid-latitude areas during the magnetic storms.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Initial Study of Adaptive Threshold Cycle Slip Detection on BDS/GPS Kinematic Precise Point Positioning during Geomagnetic Storms

Su,

Zeng,

Zhou

et al. 2024

Remote Sensing

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“…Zhang and Li (2013) conducted a study on the global‐scale correct fixing rate of PPP AR and found that the rate is significantly reduced during the hours when rapid ionospheric variations occur. Alcay (2022) selected 12 strong geomagnetic storms to analyze the impact of ionospheric disturbances on PPP and provided an ambiguity fixing success rate of 93.0% for the LPGS station during one strong geomagnetic storm. The result showed that the positioning accuracy of GPS PPP decreases significantly during geomagnetic storms.…”

Section: Introductionmentioning

confidence: 99%

Studying the Fixing Rate of GPS PPP Ambiguity Resolution Under Different Geomagnetic Storm Intensities

Luo,

Chen,

et al. 2023

Space Weather

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Global Positioning System (GPS) Precise Point Positioning (PPP) with correct fixing ambiguity resolution (AR) can reach cm‐mm level positioning accuracy. However, this accuracy can be degraded by the geomagnetic storm effects. To comprehensively investigate the ambiguity resolved percentage (ARP) of GPS kinematic PPP, referred to as PPP‐ARP, under different intensities of geomagnetic storms, based on the Natural Resources Canada's Canadian Spatial Reference System (CSRS) PPP, this study for the first time gives the correlation between the PPP‐ARP and storm intensity using 67 storms occurred in the past 5 years of 2018–2022. Experimental results indicate that the PPP‐ARP decreases gradually as the increase of geomagnetic storm intensity. Under quiet and low geomagnetic conditions (Dstmin > −50 nT), the PPP‐ARP of global GNSS stations can achieve more than 96%, while these during strong storms (Dstmin ≤ −100 nT) are generally lower than 90.0%, especially for the PPP‐ARP of some stations located at low latitudes which are lower than 40.0%. The mechanism of PPP‐ARP decrease under geomagnetic storms is mainly due to the cycle slips and even loss of lock of GNSS signals caused by the storms induced ionospheric disturbances and scintillations. In addition, different from many previous studies, we found that the CSRS‐PPP with AR can achieve good positioning accuracy (3D RMS <0.2 m) even under strong geomagnetic storms.

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Comprehensive Analysis of the Cycle Slip Detection Threshold in Kinematic PPP During Geomagnetic Storms

Li,

Su,

Tao

et al. 2023

Lecture Notes in Electrical Engineering

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Ionospheric response to extreme events and its effects on precise point positioning

Cited by 5 publications

References 22 publications

Initial Study of Adaptive Threshold Cycle Slip Detection on BDS/GPS Kinematic Precise Point Positioning during Geomagnetic Storms

Initial Study of Adaptive Threshold Cycle Slip Detection on BDS/GPS Kinematic Precise Point Positioning during Geomagnetic Storms

Studying the Fixing Rate of GPS PPP Ambiguity Resolution Under Different Geomagnetic Storm Intensities

Comprehensive Analysis of the Cycle Slip Detection Threshold in Kinematic PPP During Geomagnetic Storms

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