Drones/UAVs are able to perform air operations that are very difficult to be performed by
manned aircrafts. In addition, drones' usage brings significant economic savings and
environmental benefits, while reducing risks to human life. In this paper, we present key
technologies that enable development of drone systems. The technologies are identified
based on the usages of drones (driven by COMP4DRONES project use cases). These
technologies are grouped into four categories: U-space capabilities, system functions�…