A look at current world events shows the increasingly important role of UAS (Unmanned Aircraft Systems). The availability and therefore also the possible uses of UAS, especially so-called small UAS, have developed rapidly over the last 15 years. Nowadays, inexpensive commercial UAS can be acquired quickly and easily and operated without much prior knowledge. In addition, the possibilities to customize drones with suitable components are still open.
This results in an additional spectrum of threats from the air, ranging from spying to the disruption of processes and even the destruction of properties, critical infrastructure or events. This in turn gives rise to the need to install sensors to detect UAS, supplemented where necessary by measures to mitigate this threat.