Temat: broadband - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Detection on broadband signals in the field of aperture and array systems
Autorzy:: Mazurek, R.
Lasota, H.
Budzińska, I.
Powiązania:: https://bibliotekanauki.pl/articles/332465.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: acoustics
broadband signals
array systems
Opis:: Antennas and antenna arrays in low band underwater systems introduce significant linear distortions that affect the detection of broadband signals. The article gives an analysis of the distortions using the space-time impulse response method. The signal received at different directions is subjected to two types of filtration, one matched to the transmitted signal and another one matched to the distorted signal. For the purpose of the simulation the Matlab software was used. Detection performance can be greatly enhanced, if receiver design takes account of the distortions.
Źródło:: Hydroacoustics; 2003, 6; 275-284
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Tracking of the broadband source of the underwater noise in the very shallow water conditions
Autorzy:: Grelowska, G.
Kozaczka, E.
Powiązania:: https://bibliotekanauki.pl/articles/331537.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: broadband signals
shallow water
sound propagation
Opis:: The paper contains the results, both theoretical and experimental, connected with the tracking of the underwater noise source as small ships, pontoon, diver and so on. The problem of security in the shallow water area is the challenge for underwater acousticians. In this paper there is taken into account the detection of the sources that move on the surface of the sea or underwater in shallow and very shallow water. The main goal deals with characterization of the sound propagation at the shallow water channel. The next problem is formulation of the sound propagation inside of this acoustic duct including normal mode creations and dispersion of the acoustic energy. When we take into account the small ships noise the two main sources are analyzed. The first one is the vibration energy produced by the mechanisms located inside of the ship hull. The acoustical energy is transformed through structural elements of the hull to surrounding water. This energy propagates as broadband underwater noise. The next source is the ship propeller. The sources of the underwater noise give the some deposit to the total acoustical energy that means the ambient noise. The problem that should be solved is to discover these acoustical disturbances along with their classification, identification and tracking.
Źródło:: Hydroacoustics; 2015, 18; 77-86
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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