Researchers from the University of Texas and the University of Tennessee create #DroneChase, a Raspberry Pi-powered drone tracker that estimates the drone's location even when it's hidden from view. The #tracker uses image recognition with a camera to initially detect the #drone and then uses audio and multiple microphones to triangulate its location. The hardware includes a 3D-printed enclosure housing the Raspberry Pi, a speaker, a battery pack, and six microphones.

https://www.tomshardware.com/news/raspberry-pi-tracks-drones-with-sound