Autor: Jedel, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Bearing errors in passive sonar stationary target location
Autorzy:: Schmidt, A.
Marszal, J.
Salamon, R.
Jedel, A.
Ostrowski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/332830.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: bearing errors
passive sonar
hydroacoustics
Opis:: The paper presents a method for determining the coordinates of stationary targets using passive sonar bearing. It identifies the requirements sonar movements must meet to keep the incorrect determination of coordinates to a minimum. It gives the relations, which help determine coordinate errors analytically. Numerical experiments are used to demonstrate the success of the analysis.
Źródło:: Hydroacoustics; 2009, 12; 189-200
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Time variable gain for long range sonar with chirp sounding signal
Autorzy:: Marszal, J.
Ostrowski, Z.
Schmidt, J.
Kilian, L.
Jedel, A.
Schmidt, A.
Powiązania:: https://bibliotekanauki.pl/articles/332524.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: The main purpose of applying Time Variable Gain (TVG) in active sonars with digital signal processing is to reduce dynamic range of echo signal and adapt it to the dynamic range of the analogue to digital conversion. With high transmission losses level, the dynamic range of the input signal in long range sonars can be very high and even exceed 200 dB. When chirp sounding signals with matched filtration are used, sonars can reach very long ranges. The article presents optimisation of TVG control for long range sonars. It also looks at the influence of chirp sounding signal compression, the result of digital matched filtration, for the TVG controlling. The examples of obtained results are presented.
Źródło:: Hydroacoustics; 2007, 10; 117-122
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: High accuracy hydroacoustic system to study codend model parameters
Autorzy:: Marszal, J.
Schmidt, J.
Jedel, A.
Schmidt, A.
Wojan, Z.
Zachariasz, K.
Leśniak, W.
Powiązania:: https://bibliotekanauki.pl/articles/331608.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: codend model
hydroacoustic system
fishing gear
Opis:: An important task of fishing gear designers is to develop effective selective fishing gears by optimizing its geometry. The high accuracy hydroacoustic system for codend geometry measurements was designed for developing the construction of cod codend for the Baltic fishery. The system consists of 10 pairs of hydrophones, measuring microprocessor device and notebook computer. The high frequency short pulse excitation combined with the matched digital filtering make it possible to obtain high resolution of measure data. Additionally the thermistors mounted in the hydrophones are used to calculate the local sound velocity and enable precision calibration of obtained measuring data. The construction solutions, the measuring procedure and examples of obtained data are presented below.
Źródło:: Hydroacoustics; 2008, 11; 271-278
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

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