At CES 2016, the newly-formed Airbus Defence and Space group presented a core system to detect, track and counter UAVs. Initial detection will be with X band radar at up to 4 km range followed with thermal and optical color imaging out to 1.5 km.  (These ranges are for small DJI Phantom-like drones – longer ranges for larger UAVs) A radio direction finder will be used to locate the operator.  A UAV signature database will be available for the “human in the loop” to determine type.  Jamming of the radio control frequency, operator video feed, and GPS spoofing can be applied if the operator cannot be located or if the UAV is autonomous.  This is an institutional (.gov / mega corp) grade system, not residential…unless you’re Bill Gates, etc.  (there’s a nice video and image gallery!)