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How are several British companies freezing drones in mid-air?

Answer: radio jamming

Through the use of strong radio signals, a new system called AUDS (Anti-UAV Defense System) jams a drone's navigating capabilities, leaving the operator to believe the drone has malfunctioned on its own. A long jam will lead the drone to eventually lose power and crash, while a shorter jam could lead the operator to bring the drone home.

The three companies developing this technology are: Enterprise Control Systems, Blighter Surveillance Systems and Chess Dynamics. At least one version of the technology is in production and could be used in military defense, anti-drug smuggling and anti-terrorism applications.