engleski

Local NeQuick 2 Model Adaptation

Ionosphere causes the largest error in single-frequency satellite positioning. Dual-frequency Global Positioning System (GPS) receivers can measure actual state of the ionosphere in the area above them. Such measurements could be used to generate Satellite Based Augmentation System (SBAS) corrections. In the areas with no SBAS available and no differential positioning providers operating, ionospheric models are the only instrument that could be used for estimation of ionospheric error. The Klobuchar model used in GPS and the NeQuick model implemented in Galileo system are both relying on global data input, which is why they cannot account for sudden ionospheric changes and local anomalies. This paper describes the process of data ingestion into the NeQuick 2 model. Calibrated Total Electron Content (TEC) derived from dual frequency GPS station’s measurements is used as a reference and NeQuick 2 is fitted to match that value at the output, e.g. locally adapted. Data from Dubrovnik station in days of quiet and disturbed ionosphere were observed.

NeQuick 2; GPS data calibration; local ionospheric model

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