Diver Observations by Means of Acoustic Methods

Abstract

Searching for objects, especially small ones, moving under water near its the free surface, is always not an easy task. Designing tools for the detection of such targets is a real challenge when the possibility of a terrorist attack is a real threat. This paper presents some aspects of diver detection by means of acoustics methods, both active (side scan sonar) and passive ones (linear receiving antenna). This approach is quite e ective because divers can use both breathing apparatus operating in the closed-loop (so-called rebreathers), and popular open-circuit breathing (exhalation of used air or a breathing gas mixture into the water).

Autonomous Platform to Protect Maritime Infrastructure Facilities

“…Such solutions (sonars and magnetic barriers) are used in restricted harbour areas highly sensitive to unauthorized access (e.g., entrances to gas and oil terminals, pipelines, and ships anchored at terminals) [8,9]. A system with integrated passive and active sensors, signal processing, and fusion units should be able to detect and identify surface and underwater targets, including divers [6,7].…”