Forecasting Space Weather Effects on GNSS Systems
Appears in the following Collection
- Fysisk institutt 
AbstractSpace weather can have adverse effects on technology, such as causing disturbances of Global Navigation Satellite Systems (GNSS). As space weather effects on GNSS cannot be mitigated, it is of vital importance to develop a method for space weather forecasting. This thesis presents the motivation for developing a space weather forecast by evaluating the performance of a commercially available satellite-based positioning system over a period of three years. Next, an algorithm that can predict the worst disturbances of GNSS system is presented. The model is validated by comparing results from the prediction model to ground observations. Lastly, a method to monitor the polar ionosphere using only the Swarm satellites is presented. Plasma density variations in the polar cap ionosphere are inferred using Total Electron Content (TEC) estimates from the Swarm satellites' GPS receivers. Together, the three papers that comprise this thesis demonstrate the need for a space weather forecast service (Paper 1) and show that it is possible to predict the worst disturbances on GNSS in the European Arctic region by laying the foundation for a space weather forecast method (Paper 2 and 3).
List of papers
|Paper I: Fæhn Follestad, A., Clausen, L.B.N., Moen, J. I., Jacobsen K. S. ‘Space Weather Effects on an RTK Positioning System’. Submitted for publication in Space Weather. The paper is not available in DUO awaiting publishing.|
|Paper II: Fæhn Follestad, A., Clausen, L. B. N., Thomas, E. G., Jin, Y., Coster, A. (2019). ‘Polar Cap Patch Prediction in the Expanding Contracting Polar Cap Paradigm’. In: Space Weather, 17. DOI: 10.1029/2019SW002276. The article is included in the thesis. Also available at: https://doi.org/10.1029/2019SW002276|
|Paper III: Fæhn Follestad, A., Clausen, L. B. N., Miloch, W. J., van den Ijssel, J., Haagmans, R. (2020). ‘Two-Dimensional Reconstruction of Ionospheric Plasma Density Using Swarm’. (Accepted 29 April 2020: draft version shown here) Space Weather, 18, e2019SW002406. doi:10.1029/2019SW002406. The article is included in the thesis. Also available at: https://doi.org/10.1029/2019SW002406|