Autor: Janowski, K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Data processing of broad-band signals received by multi-element cylindrical transducer
Autorzy:: Janowski, T.
Elminowicz, A.
Szworski, K.
Powiązania:: https://bibliotekanauki.pl/articles/331559.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: data processing
multi-element cylindrical transducer
hydroacoustic
Opis:: The sonar based on cylindrical transducer compared with linear transducer has few advantages. Particularly its omni-directional central symmetry enables simplification of the echo signal Direction of Arrival (DOA) estimation. When the number of transducer staves is the power of two the efficient Fast Fourier Transformation can be used to calculate spatial convolution. The article presents theoretical and technological principles of the real time digital data processing of the wideband echo signals received by cylindrical hydroacoustic transducer. Described procedures enable high resolution underwater target location and precise data display. The implementation of effective broadband pulse compression technique with high range resolution will be presented. The results of signal processing modeling and examples of application will be also discussed.
Źródło:: Hydroacoustics; 2008, 11; 113-120
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Hardware implementation of parametric algorithm for asynchronously gathered measurement data based on the FPGA technology
Autorzy:: Janowski, T.
Szworski, K.
Zając, R.
Powiązania:: https://bibliotekanauki.pl/articles/332532.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: hardware implementation
FPGA technology
hydroacoustic system
Opis:: The hydroacoustic system based on DOA estimation utilizes passive antenna composed of many hydrophones. The samples of the arriving acoustic signal must be gathered synchronously from each hydrophone. This enables to take advantage of parametric processing signals methods. These methods make possible determination of the amplitude and the phase relationship among particular hydrophones. The newest complex systems made up of many sub modules uses network solutions. In the case of Ethernet network some standards (e.g. Precision Time Protocol) are defined to enable synchronization of the data (samples) gathered from many hydrophones by the clock synchronization. When the antenna consists of few hydrophones then the special concentrator connected point-to-point to hydrophones can be utilized. This article discusses the issue related to PTP as well as concentrator based on FPGA technology, which uses simple UDP protocol. In the case of concentrator the synchronous method of the I/Q detection which not requires synchronous samples acquisition is also presented.
Źródło:: Hydroacoustics; 2009, 12; 83-90
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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