Multipath Location Methodology for Ground Based Augmentation Systems

Within this research, two ray-tracing models for simulation of Global Navigation Satellite System (GNSS) signals reception at airports were developed. For each satellite, the algorithms determine whether the signal has arrived at the receiver through a direct path or after multiple reflections. Furthermore, the algorithms are able to estimate the number of multipath reflections and the coordinates of the reflection points within the 3D environment model. The models are established and validated using simulated as well as real data. They are especially designed for complex environments and situations where positioning with highest accuracy is required, which is the case for the Ground Based Augmentation Systems (GBAS).