3Pi is a leading expert in active and passive anti-submarine warfare (ASW) sonar processing. 3Pi has designed innovative signal processing and hardware architectures for automation of the detection, classification and tracking process of ASW threats for surface ship, submarine, anti-torpedo and UUV systems.

3Pi developed an automated torpedo defense system for large deck ships consisting of an active sonar transmitter, active and passive receive sensors, and digital signal processing. 3Pi developed innovative signal feature extraction algorithms and target classification architecture while leveraging mature beamforming, signal processing and tracking technologies to address the problem of automatic classification for operator alert. 3Pi is applying innovative Direction of Arrival (DoA) estimator algorithm technology for improved passive ranging and localization capabilities.