It comprises all the specific technologies related with the development of unmanned (without an onboard human pilot) aerial systems including any kind of vehicles, the necessary ground stations for remote piloting and control, the communications between the UAVs and with the ground station and the technologies related with the ATM for this type of aircrafts.

(Source: PAE own definition based in diverse sources, including ACARE Domain 1003, subdomains 4, 5 and 6)