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    Wyświetlanie 1-8 z 8
    Tytuł:
    Signal conditioning for examination of shallow-water acoustic noise correlation properties
    Autorzy:
    Rudnicki, M.
    Marszal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331724.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    underwater acoustics
    ambient noise
    noise envelope
    tetrahedral antenna
    Opis:
    The article describes the process of signal conditioning for examination of acoustic noise correlation properties in shallow water. Knowledge of these properties is very important for the design processes of passive and active hydroacoustic systems. This paper focuses on the above issue from the point of view of passive sonar. In sonar systems, signal processing algorithms operate on both useful acoustic signals, and accompanying noise. Quantitative estimation of the correlation properties of acoustic noise enables an accurate determination of detection conditions. This will verify the validity of certain commonly used simplified models in simulations of hydroacoustic systems. The article presents how the measurement system was constructed, and the structure of files for storing measurement data. It describes the processing algorithm developed for the measured signal conditioning. Research results are presented and discussed.
    Źródło:
    Hydroacoustics; 2016, 19; 335-340
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silent sonar with matched filtration
    Autorzy:
    Salamon, R.
    Marszal, J.
    Schmidt, J.
    Rudnicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/331754.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Radars with continuous wave frequency (CW FM sonars) are used in radiolocation as ‘silent radars’. They determine the distance to target by measuring the difference between the frequency of the sounding signal and echo signal. The article presents the principle of operation and parameters of silent CW FM sonars. Target distance determined by these sonars is based on the signal at the output of the matched filter. The Doppler effect is studied in detail to identify its effect on the sonar’s parameters. The results of theoretical calculations are presented together with the results of the sonar’s computer simulation.
    Źródło:
    Hydroacoustics; 2011, 14; 199-208
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic signal processing in passive sonar system with towed array
    Autorzy:
    Raganowicz, A.
    Rudnicki, M.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331645.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    sonar system
    acoustic signal processing
    towed array
    Opis:
    The aim of this document is to introduce acoustic signal processing in passive sonar system with towed array. The concept of the "acoustic signals processing" includes all possible operations on analogue signals such as amplifying, filtering, sampling and most importantly - operations on digital signals obtained in the sampling process. Digital operations executed in the system include: synchronizing, conversion, sorting, creating deflected beams sets, plotting the power density spectrum received signals and imaging the results. Apart from digital signals processing, we focus on reciprocal connections between microcontrollers and processors in which processing is performed. At the end of this document some exemplary imagings of the output are presented, obtained at the marine testing of this system.
    Źródło:
    Hydroacoustics; 2008, 11; 329-338
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    General analysis of broadband signal spatial filtration
    Autorzy:
    Salamon, R.
    Rudnicki, M.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332491.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    acoustics
    spatial filtration
    underwater acoustic
    Opis:
    The majority of underwater acoustic systems use narrow band sounding signals. Consequently, there is extensive knowledge on how the relevant spatial filters should be analysed and designed. The difficulty begins when the sounding signal has a broad spectrum. Applying the results of narrow band signal analysis to broadband signals leads to serious errors. The same is true for spatial filtration methods when applied to narrow band signals. The article presents a general method for analysing spatial filters designed for broadband signals. It also gives an assessment of the errors caused by applying spatial filtration methods designed for narrow band signals.
    Źródło:
    Hydroacoustics; 2003, 6; 251-260
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic processor of the mine countermeasures sonar
    Autorzy:
    Rudnicki, M.
    Schmidt, J.
    Schmidt, A.
    Leśniak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/331928.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    This paper presents the concept of an acoustic processor of the mine countermeasure sonar. Developed at the Department of Marine Electronics Systems, Gdansk University of Technology, the acoustic processor is an element of the MG-89, an underwater acoustic station. The focus of the article is on the modules of the processor. They are responsible for sampling analogue signals and implementing the algorithms controlling the measurement cycle and digital signal processing. As it performs the above functions, the device should be highly reliable and resistant to mechanical and weather conditions and ensure a user friendly operation. The functions of the processor software should help with object detection and classification. The results of measurements should be displayed with the shortest possible delay in relation to sounding signals to allow the operator to take decisions quickly and establish if the object poses a risk. The article demonstrates that the acoustic processor designed for and used by the Navy meets these requirements.
    Źródło:
    Hydroacoustics; 2012, 15; 179-186
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Workstation for training ASW helicopter navigators and analysing real flight data
    Autorzy:
    Raganowicz, A.
    Kilian, L.
    Marszal, J.
    Schmidt, A.
    Sidorko, T.
    Rudnicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/332784.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    helicopter navigators
    real flight data
    aviation
    Opis:
    The article presents a training and diagnostic workstation designed for Polish Navy ASW helicopter navigators. Installed at the helicopter base, the workstation is used for training and instruction in operating the device and analysing information gathered by navigators during the flight using the ASW onboard sonar, sonobuoy receiver and magnetometer. The workstation allows instructors to task two operators and monitor their performance under conditions resembling those onboard a plane. The tasks involve the operation of the consoles and collecting information during tactical situations, diagnosing damage and analysing flight data in office environment. The objective is to ensure proper helicopter navigator training and experience given the limited possibility of training flights.
    Źródło:
    Hydroacoustics; 2009, 12; 181-188
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modernization of ASW sonar SQS-56 at Gdansk University of Technology
    Autorzy:
    Marszal, J.
    Schmidt, J.
    Salamon, R.
    Kilian, L.
    Raganowicz, A.
    Zachariasz, K.
    Ostrowski, Z.
    Jedel, A.
    Rudnicki, M.
    Sidorko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/331991.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The fast development of electronic technology and digital signal processing methods makes electronic devices, including sonar systems ones, obsolete very quickly. On the other hand the ships mechanical components including mechanical parts of sonars are operational for a few dozens of years. It makes good opportunity to modernize these devices by using modern electronic devices and new digital signal processing methods with application of existing antenna and mechanical systems. The paper presents the modernization of ASW sonar SQS-56 on the Polish frigate ORP “Kościusko”. The aim of modernization, the new parameters of the sonar and block diagram after modernization are presented.
    Źródło:
    Hydroacoustics; 2010, 13; 191-196
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multibeam sonar with hexagonal array
    Autorzy:
    Salamon, R.
    Marszal, J.
    Kilian, L.
    Jedel, A.
    Ostrowski, Z.
    Raganowicz, A.
    Rudnicki, M.
    Wofan, Z.
    Zachariasz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/332250.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper presents a multi-beam digital sonar that was designed for monitoring and fish stock assessment in in/and waters. The sonar can also be used as a bottom profiler in lakes, rivers and shallow sea areas. The hexagonal piezoelectric transducer array co-operates with a commutator set. The 32 -channel digital beamformer creates 30 narrow receiving beams in every 60o sector of simultaneous observation. The six sectors cover the whole 360o angle range of the sonar. The beamformer digital signal processing is based on second order sampling of echo signals and the phase-shifting principle of beam deflection. The sonar block diagram, beamformer algorithms, as well as transducers designs are discussed.
    Źródło:
    Hydroacoustics; 1999, 2; 133-138
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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