Project BAT
Tyrfing Arms is developing BAT, a compact hemispherical microphone array for real-time UAV detection and direction-finding at forward positions, checkpoints, and critical infrastructure sites.
Acoustic drone detection is an established, NATO-proven technology — but existing systems are designed for fixed installations only. There is no commercially available solution for vehicle-mounted, mobile acoustic C-UAS.
This gap is confirmed by Norway's current C-UAS procurement framework, which covers fixed sites exclusively. The same detection gap exists across critical infrastructure, border crossings, and public venues.
BAT uses an array of six MEMS microphones in a hemispherical configuration to detect and locate drones in real time by analysing their rotor acoustic signatures. The system is fully passive — no RF emissions, no licensing required.
Prototype development
Field testing planned with a target drone as acoustic reference.
Tyrfing Arms AS is a Norwegian defence technology startup based in Oslo. The company was founded by a researcher with a PhD in physics and electronics, and prior experience from drone systems research, materials science, artificial intelligence, and modern software development.