What's the best way to detect and destroy drones?

"The device detects communication between the drone and its pilot, then breaks that connection, explains Mr Hermansen, by emitting a powerful radio signal on the same frequency. Rather than falling out of the sky, the drone is pushed away and has a controlled landing. If it tries to reconnect to a GPS signal, that can be blocked too, he adds. Mr Hermansen reckons that radio frequency jamming works against 80 to 90% of the drones that are flown."

"While forcing an unwanted drone to crash land is a good result, it's essential to be able to detect it first. "The first part is really about identification. And the second part is an interceptor system," explains Kasper Hallenborg, director of The Maersk Mc-Kinney Moller Institute at University of Southern Denmark. Identifying a drone is not so easy, points out Andreas Graae, the head of research at the Institute of Military Technology at the Danish Defence Academy."

Demand for drone countermeasure equipment has expanded from military clients to civilian critical infrastructure and large companies seeking asset protection. Small box-like kits detect communication between drone and pilot and disrupt that link by emitting powerful radio signals on identical frequencies, pushing drones away for controlled landings; GPS reconnection can also be blocked. Radio-frequency jamming is effective against roughly 80–90% of drones. Detection remains challenging because drones vary in size and often use low-radar materials like plastic or fabric. Detection technologies under development include acoustic sensors, high-resolution optical cameras, and integrated sensor suites combined with interceptor systems.

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