Eyjafjallajokull Volcanic Ash 2010 Effects on GPS Positioning Performance in the Adriatic Sea Region

Article Environmental Sciences

Multi-Scale Ionospheric Anomalies Monitoring and Spatio-Temporal Analysis during Intense Storm

Na Cheng et al.

Summary: This study used GNSS observations to monitor ionospheric anomalies in China during the 2015 storm, revealing large-scale and small-scale anomalies, as well as ionospheric scintillation. The results showed enhanced TEC and IED at the beginning of the storm's main phase, with long-duration TEC depletion during the recovery phase. Analysis also demonstrated the suppression of ionospheric scintillation due to storm-induced TEC depletions.

ATMOSPHERE (2021)

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Article Geochemistry & Geophysics

Total Electron Content (TEC) estimation over Pakistan from local GPS network using spherical harmonics

Maria Mehmood et al.

Summary: This study presents the first local TEC map over Pakistan for 2019 derived from a regional GPS network. Spherical harmonics expansion is utilized with a resolution of 0.2 degrees in latitude and longitude, and 5-minute temporal resolution. The research demonstrates that expanding harmonics up to 6 degrees is adequate for accurately estimating the TEC map for the region.

ANNALS OF GEOPHYSICS (2021)

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Article Environmental Sciences

Comparison of Single-Site Ionospheric Delays Derived from Geometry-Free and Geometry-Based Approaches with an Analysis of Orbit and Clock Error Effects

Sijing Liu et al.

Summary: The reparameterization of the geometry-free and geometry-based approaches to derive single-site ionospheric delays using GNSS measurements is described. Numerical similarity and differences between the two approaches are assessed in terms of formal and experimental errors. The impacts of precise orbit and clock residual errors on the ionospheric delay estimates are analyzed, along with the correlation coefficients with wide-lane ambiguities.

ATMOSPHERE (2021)

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Article Environmental Sciences

Adjusting CCIR Maps to Improve Local Behaviour of Ionospheric Models

Haris Haralambous et al.

Summary: This article introduces a concept for local ionospheric mitigation in single-frequency GNSS positioning, which utilizes input parameters and measurements to improve accuracy and reduce positioning errors.

ATMOSPHERE (2021)

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Article Geochemistry & Geophysics