Identification of hydro-acoustic waves emitted from floating units during mooring tests

Abstract

MOORING TESTS OF THE SHIPThe measurements were carried out in Gdańsk Bay waters in the area free from disturbances generated by marine industry, merchant and naval ports and fairways. Schematic diagram of the testing range is presented in Fig. 1.

Underwater Noise Generated by a Small Ship in the Shallow Sea

“…Few of components are strong enough to be contributors to the high-speed signature. The tonal levels of ship's service diesel generator are nearly stable in amplitude and frequency (Kozaczka et al, 2007a). The wide-band energy of the noise generated by the ship's service generator is proportional to the square of generated power (Urick, 1975).…”

“…Military techniques utilize phenomena of generation and propagation in water of the acoustic waves produced by ships (Kozaczka, 1978;Ross, 1976) for monitoring their movement in a fixed sea area (Kozaczka et al, 2007a;2007b) with the possibility of their classification and identification (Grelowska et al, 2012). This fact forces the users of military equipment to lower the noise produced by their individual ships to the spectral level of the environmental noise (Urick, 1975).…”

Digital Signal Processing Applied to the Modernization Of Polish Navy Sonars

“…Because passive sonars receive and process broadband signals of shipping noise with frequency bands comprising several octaves [9,17,18,19], spatial signal processing in the sonars is much more complex than described in the previous section. The SQR-19PG sonar with towed linear array is an example.…”

Underwater Acoustic Imaging of the Sea

“…Applying a linear antenna in a system tracking a tone source is described in work (Orlov and Rodionov, 2008), while in our experiment the real sources producing broadband noise are the observed objects (Kozaczka, Grelowska, 2011;Grelowska et al, 2013b;Kozaczka et al, 2007aKozaczka et al, , 2007b.…”

“…The systems of active observation are usually active sonars, omnidirectional or sector, in which the data is processed in such a way that successive images from selected sector are stored and played back sequentially, resulting in information about the change of the location of all the objects in the area of observation (Marszal, Salamon, 2012;Kozaczka et al, 2007aKozaczka et al, , 2007bIwaniec, Wiciak, 2002). This kind of solution is very useful for underwater monitoring systems, systems of protection of maritime critical infrastructure, particularly ports and oil platforms (Fig.…”