Detection of nearby UAVs using a multi-microphone array

The Detection of Nearby UAVs using a multi-microphone array is a passive acoustic surveillance technique that identifies and locates unauthorized drones by analyzing the unique sound signatures of their motors and propellers. An array of spatially distributed, sensitive microphones captures ambient noise, and advanced signal processing algorithms compare the received audio against a library of drone acoustic profiles. By analyzing time-of-arrival differences at each microphone, the system can also triangulate the drone’s direction and approximate range, providing a stealthy, radar-independent early warning layer for counter-UAS (C-UAS) systems protecting critical infrastructure, military bases, and public venues.

Core Technical Process:
– Acoustic Signature Library: Contains digital fingerprints of various commercial and custom drone models, distinguishing them from background noise (birds, vehicles, wind).
– Beamforming & Direction Finding: The multi-microphone array uses beamforming algorithms to determine the direction of arrival (DOA) of the dominant drone sound.
– Time Difference of Arrival (TDOA): Calculates the slight differences in sound arrival time at each microphone to estimate the drone’s location in 2D or 3D space.
– Classification & Tracking: AI/ML algorithms classify the drone type and can track its movement by continuously updating the directional data.
– Passive & Covert Operation: Emits no signals, making it undetectable and ideal for use in electronic silence or environments where RF emissions are restricted.
– All-Weather & Low-Altitude Effectiveness: Particularly effective against small, low-flying drones that may evade radar detection due to size or terrain masking.

Hear the threat before it’s a visual threat. Integrate a passive multi-microphone acoustic detection array into your C-UAS strategy with solutions from Tactical Supply Pakistan.