default Advances in DLCT for passive and active sonar

By In Memorandum Reports

Advances in DLCT for passive and active sonar. Bates, Jeffrey; Stinco, Pietro; Canepa, Gaetano; Micheli, Michele; Tesei, Alessandra. CMRE-MR-2018-006. November 2018.

The cooperative ASW programme is investigating state-of-the-art sensing payloads and real-time Detection, Localization, Classification and Tracking (DLCT) algorithms deployed on heterogeneous autonomous vehicle networks. Recent scientific activities have addressed active sonar signal processing using towed arrays (linear and triplet) and passive sonar signal processing using compact, directive acoustic sensors at low frequencies (less than 2 kHz). In particular, DLCT scientific activities on active sonar have addressed: (a) improvement of detection performance in CAS sonar mode; (b) optimization of DHMT parameter settings applied to PAS and CAS modes; (c) implementation of a triplet array beamformer (cardioid and 3D) to run on OEX-C AUVs in real-time. Recent scientific activities to achieve the passive acoustic monitoring ASW mission include: (a) analysis of low-frequency (< 2 kHz) data collected at the end of June 2018 from a Geospectrum 3D Acoustic Vector Sensor (AVS) under a controlled and repeatable environment (i.e., in a calibration water tank); (b) application of Direction of Arrival (DOA) methodologies based on either 3D linear beamforming or intensity vector. The sensor was installed on the nose of an underwater buoyancy glider (TWR Slocum glider G2) in static conditions. A selection of promising results is presented and discussed.