A Risk Assessment of Geomagnetic Conditions Impact on GPS Positioning Accuracy Degradation in Tropical Regions Using DST

The study presents a risk assessment of GPS positioning accuracy degradation under different geomagnetic conditions in tropical regions. GPS positioning errors obtained from observations at the IGS reference station in Darwin, Australia, are analysed in relation to the Dst geomagnetic activity index. The approach estimates the risk of GPS positioning performance failing to meet the requirements of aviation, maritime and location-based services.