Combining High Precision and Interference Resilient Positioning Using Spatial Filtering for Real-World Jamming Scenarios

Kurzfassung

The high relevance of GNSS for positioning and timing in different applications increase the risk of (intended or unintended) radio interference (e.g. jamming or spoofing). One of the most sophisticated and efficient countermeasure against this threat is an antenna array, which can utilize a spatial filter to mitigate malevolent signals (e.g. by placing a spatial null in the direction of these signals). Using an antenna array together with carrier phase positioning (used for highly accurate and precise positioning like RTK or PPP) requires extra care, because the spatial filtering manipulates the incoming phase of the different antenna elements in order to form the interference free signal. In this paper we will propose and compare two different approaches to mitigate interference and simultaneously maintain a consistent carrier phase measurement. The first approach does not need any preliminary information about the antenna array (blind approach), while the second approach explicitly requires such information (deterministic approach). These approaches will be tested in two different real-world scenarios including a low and a high dynamic jamming scenario. The results show that both approaches are valuable in different situations. However, the deterministic approach performs better in a matter of accuracy and precision even with unprecise knowledge about the antenna pattern.