Detecting multirotors using their sound-print

20 May , 2015  

Alsok, a Japanese company, also known as Sohgo Security Services, is developing a service that can detect incoming multirotors in the sky using their sound signature. This comes after a multirotor landed on Japan’s prime minister’s roof in April.

For this service, Alsok will use U.S.-made audio sensors that can capture sounds within a radius of 150 meters. For a building the size of the prime minister’s office, three of the sensors will be able to cover the entire area.

When the audio sensors pick up sounds, the system checks a database of audio fingerprints to determine if a drone has approached and to identify the type of drone. For added precision, image sensors can capture the shape of the drone. A warning is then sent to security personnel.

Their services is set to cost a couple of thousand dollars a month, but that is cheaper than using human eyes and ears to detect incoming “drones”. The question is, once it is detected, how will security handle these “threats”?

Securing the skies: Japan's Alsok to warn when drones invade – Nikkei Asian Review.