Correlation between Ionospheric Spatial Decorrelation and Space Weather Intensity for Safety-Critical Differential GNSS Systems

Lee, Jin-Sil

doi:10.3390/s19092127

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…Instead of the traditional Instrument Landing System (ILS), several prototype airports have used systems for GNSS landings and takeoffs. These prototype airports are in areas in which the occurrence of scintillation is negligible [6][7][8]. Stankov et al [5] suggest that one important objective is to assess the integrity risk to GBAS/ SBAS services.…”

Section: Introductionmentioning

confidence: 99%

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Extreme Solar Events’ Impact on GPS Positioning Results

2021

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The main objective of the present study is to perform an analysis of the space weather impact on the Latvian CORS (Continuously Operating GNSS (Global Navigation Satellite System) Stations) GPS (Global Positioning System) observations, in situations of geomagnetic storms, sun flares and extreme TEC (Total Electron Content) and ROTI (Rate of change of TEC index) levels, by analyzing the results, i.e., 90-second kinematic post-processing solutions, obtained using Bernese GNSS Software v5.2. To complete this study, the 90-second kinematic time series of all the Latvian CORS for the period from 2007 to 2017 were analyzed, and a correlation between time series outliers (hereinafter referred to as faults) and extreme space weather events was sought. Over 36 million position determination solutions were examined, 0.6% of the solutions appear to be erroneous, 0.13% of the solutions have errors greater than 1 m, 0.05% have errors greater than 10 m, and 0.01% of the solutions show errors greater than 50 meters. The correlation between faulty results, TEC and ROTI levels and Bernese GNSS Software v5.2 detected cycle slips was computed. This also includes an analysis of fault distribution depending on the geomagnetic latitude as well as faults distribution simultaneously occurring in some stations, etc. This work is the statistical analysis of the Latvian CORS security, mainly focusing on geomagnetic extreme events and ionospheric scintillations in the region of Latvia, with a latitude around 57° N.

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Section: Introductionmentioning

confidence: 99%

“…Research on the correlation between GNSS-derived ionospheric spatial de-correlation and space weather intensity for safety-critical differential GNSS systems was carried out by Lee and Lee [8]. Space weather events that occurred in 2015 have been extensively analyzed by the research society around the world.…”

Section: Introductionmentioning

confidence: 99%

Extreme Solar Events’ Impact on GPS Positioning Results

2021

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“…The satellite elimination [15] was also applied to this method to increase the success of the estimation. [18] Datta-Barua et al [19] Lee et al [16] Lee et al [20] Single-frequency receiver Fujita et al [13] Budtho et al [21] Khanafseh et al [22] -Mixed-pair method Lee et al [20] However, for most areas in Thailand, the GNSS receivers are widely separated (more than 20 km baselines) since they are not originally intended for delay gradient monitoring. The miss detection of the high delay gradients over short baselines remains.…”

Section: Introductionmentioning

confidence: 99%

Single-Frequency Time-Step Ionospheric Delay Gradient Estimation at Low-Latitude Stations

2020

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The irregularity of the local-area ionospheric delay is a primary impediment for Ground-Based Augmentation System (GBAS) services. Excessive ionospheric delay gradients may degrade aircraft positioning for high precision landing systems. Therefore, the spatial gradients of the nominal background ionosphere must be studied as their statistics will be sent to the approaching aircraft. For the well-known stationpair method, ionospheric delay gradient estimation requires at least 2 Global Navigation Satellite System (GNSS) reference stations. This method can be applied to both single or dual-frequency GNSS receivers. However, when the GNSS stations are far apart, it is not suitable for estimating the ionospheric delay gradients at short baselines, and the time-step method is an attractive alternative. In this work, we propose a singlefrequency time-step method for ionospheric delay gradient estimation. Careful baseline length selection is needed, due to ionospheric piercing point movements. We applied our method to GNSS data in 2014, at the peak of the 24th solar cycle, and showed that the standard deviations of the vertical ionospheric delay gradients were comparable to those derived from the dual-frequency time-step method. The standard deviations of vertical ionospheric gradients, VIG, ranged between 4 and 6 mm/km. The VIG values around the equinoxes were ~1.5 mm/km greater than at other times.

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“…Historically midlatitude areas were less investigated, thus only little investments and research were dedicated to these phenomena in these regions (Skone 2001), however the situation has evolved. The research on the correlation between GNSS-derived ionospheric spatial de-correlation and space weather intensity for safety-critical differential GNSS systems was carried out by Lee and Lee (2019).…”

Section: The Above Described Examples and Multiple Studies Carried Ou...mentioning

confidence: 99%

Space Weather Impact on GPS Positioning Results in Latvia

Normanda

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The objective of the Doctoral Thesis is to validate the stability of the Latvian GNSS continuously operating reference stations in extreme situations of solar activity. This study assesses the impact of geomagnetic storms on positioning accuracy and coordinates stability over an 11-year period covering the whole 24th solar activity cycle. The statistical analysis is performed on the results of kinematic solutions in relation to ionospheric total electron content (TEC) and rate of change of TEC index (ROTI) levels in the midlatitude region, Latvia.

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Correlation between Ionospheric Spatial Decorrelation and Space Weather Intensity for Safety-Critical Differential GNSS Systems

Cited by 5 publications

References 22 publications

Extreme Solar Events’ Impact on GPS Positioning Results

Extreme Solar Events’ Impact on GPS Positioning Results

Single-Frequency Time-Step Ionospheric Delay Gradient Estimation at Low-Latitude Stations

Space Weather Impact on GPS Positioning Results in Latvia

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