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    Tytuł:
    Implementation of contemporary technologies in naval sonars modernization
    Autorzy:
    Marszal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331808.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Today’s fast technological advancement in electronics and signal processing methods makes electronic systems, including sonars, obsolete very quickly. The Polish Navy seems to be particularly affected as its ships were built in the 1970s and 1980s. Researchers at the Gdansk University of Technology have developed a methodology for modernising Navy sonars which involves the use of new electronic sub-systems and modern, bespoke methods of digital signal processing. Thanks to that, the existing large and expensive ultrasonic transducers and their systems for deployment and stabilisation remain unchanged. Between 2001 and 2013 this methodology was used by the Gdansk University of Technology to modernise 26 sonars of different types for the Polish Navy. The projects have significantly improved the technical and utility parameters of the sonars, while keeping the expenditure at about 20% of the value of new equipment.
    Źródło:
    Hydroacoustics; 2013, 16; 167-180
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The numerical solution of boundary value problems of the theory of thermal stresses of isotropic plates
    Autorzy:
    Marszał, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/748585.pdf
    Data publikacji:
    1976
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Opis:
    Artykuł nie zawiera streszczenia
    The article contains no abstract (see MR0452060)
    Źródło:
    Mathematica Applicanda; 1976, 4, 8
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital signal processing applied to the modernization of Polish Navy sonars
    Autorzy:
    Marszal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/260133.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sonar
    anti-submarine warfare
    mine countermeasure
    digital signal processing
    Opis:
    The article presents the equipment and digital signal processing methods used for modernizing the Polish Navy’s sonars. With the rapid advancement of electronic technologies and digital signal processing methods, electronic systems, including sonars, become obsolete very quickly. In the late 1990s a team of researchers of the Department of Marine Electronics Systems, Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, began work on modernizing existing sonar systems for the Polish Navy. As part of the effort, a methodology of sonar modernization was implemented involving a complete replacement of existing electronic components with newly designed ones by using bespoke systems and methods of digital signal processing. Large and expensive systems of ultrasound transducers and their dipping and stabilisation systems underwent necessary repairs but were otherwise left unchanged. As a result, between 2001 and 2014 the Gdansk University of Technology helped to modernize 30 sonars of different types.
    Źródło:
    Polish Maritime Research; 2014, 2; 65-75
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of Silent Sonar
    Autorzy:
    Marszal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/177418.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silent sonar
    wideband signal
    detection
    distance measurements
    accuracy
    Opis:
    Stealth is a frequent requirement in military applications and involves the use of devices whose signals are difficult to intercept or identify by the enemy. The silent sonar concept was studied and developed at the Department of Marine Electronic Systems of the Gdansk University of Technology. The work included a detailed theoretical analysis, computer simulations and some experimental research. The results of the theoretical analysis and computer simulation suggested that target detection and positioning accuracy deteriorate as the speed of the target increases, a consequence of the Doppler effect. As a result, more research and measurements had to be conducted to verify the initial findings. To ensure that the results can be compared with those from the experimental silent sonar model, the target’s actual position and speed had to be precisely controlled. The article presents the measurement results of a silent sonar model looking at its detection, range resolution and problems of incorrect positioning of moving targets as a consequence of the Doppler effect. The results were compared with those from the theoretical studies and computer simulations.
    Źródło:
    Archives of Acoustics; 2014, 39, 1; 103-115
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection Range of Intercept Sonar for CWFM Signals
    Autorzy:
    Marszal, J.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/176394.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intercept sonar
    silent sonar
    CWFM signal
    detection
    detection range
    Opis:
    Stealth in military sonars applications may be ensured through the use of low power signals making them difficult to intercept by the enemy. In recent years, silent sonar design has been investigated by the Department of Marine Electronic Systems of the Gdansk University of Technology. This article provides an analysis of how an intercept sonar operated by the enemy can detect silent sonar signals. To that end a theoretical intercept sonar model was developed with formulas that can numerically determine the intercept ranges of silent sonar sounding signals. This was tested for a variety of applications and water salinities. Because they are also presented in charts, the results can be used to compare the intercept ranges of silent sonar and traditional pulse sonar.
    Źródło:
    Archives of Acoustics; 2014, 39, 2; 215-230
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Doppler estimation method for moving target location
    Autorzy:
    Salamon, R.
    Marszal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331983.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The article presents an algorithm for target location based solely on Doppler shift of echo acoustic signals of a moving underwater object. The algorithm is designed for use in multi-static systems for protecting bodies of water from terrorist attacks by divers or submerged vehicles. The original source of signals is a transmitter emitting continuous acoustic waves. The echo signals from moving object are received by hydrophones located at fixed and known points in the water. Doppler shifts are determined from discrete Fourier transforms of hydrophone signals. The proposed iterative algorithm for target location calculates the approximate values of target speed vector and target coordinates which correspond to speed vectors as calculated previously.
    Źródło:
    Hydroacoustics; 2010, 13; 225-234
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical analysis of a new approach to order determination for a modified Prony method in swath mapping application
    Autorzy:
    Grall, P.
    Marszal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332107.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    swath bathymetry
    interferometry
    principal components
    DOA
    MBES
    Opis:
    This article presents a new approach to determine the model order (number of principal components) in the modified Prony method applied to swath acoustic mapping. Determination of the number of principal components is a crucial step in the modified Prony method. In the proposed approach the model order is chosen based on the underlying physical model of the underwater acoustic environment, and utilised signal processing operations. This data-driven approach, attempts to make use of all available information to assess the number of signals arriving at the receiver using pipeline processing in lieu of iterative processing.
    Źródło:
    Hydroacoustics; 2017, 20; 63-74
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distance measurement errors in silent FM-CW sonar with matched filtering
    Autorzy:
    Marszal, J.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/220637.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silent sonar
    frequency modulation
    continuous wave
    matched filtering
    distance measurement
    errors
    Doppler effect
    Opis:
    The secretiveness of sonar operation can be achieved by using continuous frequency-modulated sounding signals with reduced power and significantly prolonged repeat time. The application of matched filtration in the sonar receiver provides optimal conditions for detection against the background of white noise and reverberation, and a very good resolution of distance measurements of motionless targets. The article shows that target movement causes large range measurement errors when linear and hyperbolic frequency modulations are used. The formulas for the calculation of these errors are given. It is shown that for signals with linear frequency modulation the range resolution and detection conditions deteriorate. The use of hyperbolic frequency modulation largely eliminates these adverse effects.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 321-332
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation into interferometric sonar system accuracy
    Autorzy:
    Grall, G.
    Marszal, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332610.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    bathymetry
    phase differencing sonar
    hydrographic standards
    Opis:
    The results of the accuracy measurements of phase differencing bathymetric sonar (PDBS) system in shallow waters are presented in the article. The measurement results were compared with the theoretical calculations for sonar system accuracy and international standards for hydrographic surveys. The proposed formulas enable to assess a priori sonar system performance using system quality factor (SQF), which takes into account influence of variable environmental conditions and auxiliary sensors on depth accuracy in a real-life scenario. The proposed SQF can be used in survey planning process to predict the swath width.
    Źródło:
    Hydroacoustics; 2015, 18; 69-76
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of distance measurement errors in CW FM sonar with MLS code modulation
    Autorzy:
    Jedel, A.
    Marszal, J.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/331626.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    CW FM sonar
    pseudorandom sequence
    Doppler effect
    sonar parameters
    Opis:
    Although used in the classic silent sonar, the CW FM sounding signal has a major flaw which is its inaccuracy in determining the distance to a target. The authors of the article have developed a concept of silent sonar using frequency modulation signals switched by pseudorandom codes, already discussed in their previous work. This article presents a detailed analysis of errors in CW FM sonar with pseudo-random sequence code modulation confronted with errors which occur in similar sonar without code modulation.
    Źródło:
    Hydroacoustics; 2017, 20; 75-84
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Continuous wave sonar with hyperbolic frequency modulation keyed by pseudo-random sequence
    Autorzy:
    Jedel, A.
    Marszal, J.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/331999.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    CW FM
    pseudorandom sequence
    Doppler effect
    matched filtering
    Opis:
    A CW FM type sounding signal is used in the classical solution of silent sonar. While the signal provides a relatively simple implementation of digital signal processing, and ensures good detection conditions, unfortunately, in the presence of the Doppler effect, distance measurement results tend to be wrong. This is due to the fact that the received signal’s instantaneous frequency value is dependent both on the distance to the object, and its speed. Sounding signal, as patented by the authors, is a combination of Pseudo-Random Sequences (PRS), and elementary signals of Hyperbolic Frequency Modulation (HFM) type. The structure of this signal is aimed at minimizing measurement error. The article presents the idea of a sounding signal of HFM+PRS type, and the results of computer simulations.
    Źródło:
    Hydroacoustics; 2016, 19; 185-196
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Small antenna for a dipping sonar
    Autorzy:
    Marszal, J.
    Jedel, A.
    Ostrowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332487.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The dome enclosing the antenna of dipping sonar should be of the smallest possible size. Presented in the paper is a concept of hydroacoustic antennas of active and passive sonar. The active antenna performs mechanical scanning while the passive antenna uses the orthogonal array of gradient hydrophones. In addition to that the antenna array includes ultrasonic transducers of a sound velocity profiler, a pressure sensor for measuring the depth of antenna submergence. With that many sources of signal in the sonar's ease, a multiple fibre cable is required or signal modulation to transmit the signals over a limited number of wires. The sonar in question uses distribution over time and an original modulation method for simultaneous transmission of several signals using a cable channel. Block diagram and formulas describing the entire signal from the sonar's antenna are included.
    Źródło:
    Hydroacoustics; 2001, 4; 169-172
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of maximum length sequence in silent sonar
    Autorzy:
    Marszal, J.
    Salamon, R.
    Kilian, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/331898.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Silent sonars are designed to reduce the distance over which their sounding pulses can be detected by intercept sonars. In order to meet this objective, we can use periodical sounding signals that have low power, a very long duration and wide spectrum. If used in the silent sonar’s receiver, matched filtration ensures very good detection of motionless or slow moving targets. However, it is more difficult to detect echo signals of fast moving targets with Doppler effect causing significant error in target distance measurements. In an effort to find signals that can better resist Doppler effect, maximum length sequence was tested for its application in silent sonar. It has an elementary signal which includes linear frequency modulation. It was demonstrated that the signal produces much better results than those obtained with simple frequency modulation signals.
    Źródło:
    Hydroacoustics; 2012, 15; 143-152
    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:
    Electronic stabilization of beams in sonar with cylindrical array
    Autorzy:
    Marszal, J.
    Leśniak, W.
    Salamon, R.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332362.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The article presents the principle of operation of the beamformer of sonar with a cylin-drical array. It demonstrates that a modified beamformer can be used for beam electronic stabilization. The paper presents the algorithm of a digital beamformer used to ensure that the beam’s axis is maintained in a horizontal plane when the ship’s pitch and roll are known. Finally, the article gives an overview of the technical problems of electronic beam deflection.
    Źródło:
    Hydroacoustics; 2006, 9; 119-124
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doppler effect in the cw fm sonar
    Autorzy:
    Marszal, J.
    Salamon, R.
    Zachariasz, K.
    Schmidt, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331758.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    When sonars are used for military purposes they have to ensure unobtrusive operation, afeature that can be potentially secured by ‘silent sonars’ or continuous wave frequency modulation sonars (CW FM sonars). The article presents how these sonars operate and identifies the relations between their parameters. The Doppler effect and its impact on the CW FM sonar are studied to identify how it affects the sonar’s parameters. The results of simplified theoretical calculations are supported with results of computer simulations of a more realistic model.
    Źródło:
    Hydroacoustics; 2011, 14; 157-164
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Autonomous hydroacoustic sound velocity profiler
    Autorzy:
    Jedel, A.
    Marszal, J.
    Ostrowski, Z.
    Kilian, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/332093.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    hydroacoustics
    sound velocity profiler
    Opis:
    The paper presents the autonomous hydroacoustic sound velocity profiler collaborating with ordinary PC by small box included interface & battery charger. The measurement and calibration methods and block diagram of the meter are presented as well as principles of operation, data collection, selection and transmission. There are described three versions of this meter - dropped from "normal" ships, installed in the light hull of submarines and casings in the hulls of variable depth sonar antennas.
    Źródło:
    Hydroacoustics; 2003, 6; 261-266
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mutual Clutter Suppression Techniques for FM Sonars
    Autorzy:
    Marszal, J.
    Rudnicki, M.
    Jedel, A.
    Salamon, R.
    Kochańska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/176495.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sonar
    signal processing
    FM
    LFM
    HFM
    clutter
    crosstalk
    Opis:
    The article presents methods that help in the elimination of mutual clutter as well as the consequences of two FM sounding signal sonars operating in the same body of water and frequency band. An in-depth analysis of mutual clutter was carried out. The effects of sounding signal differentiation were determined, as was the Doppler effect on mutual clutter suppression. One of the methods analysed is of particular interest in a situation in which collaborating sonars are operating in opposite frequency modulation directions. This method is effective for both linear and hyperbolic frequency modulations. A formula was derived, identifying exactly how much quantities of clutter may be lessened. The work included comprehensive computer simulations and measurements as well as tests in real-life conditions.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 721-729
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signal processing in the hydroacoustic ships berthing aid system
    Autorzy:
    Marszal, J.
    Salamon, R.
    Kilian, L.
    Raganowicz, A.
    Szurowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/332707.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The berthing of ships is an extremely complicated task that requires decisions on the movement of ships based on a large number of variabies: tide wind, visibility, speed, distance from jetty. Particular difficulties are related to the less maneuverable ships such as very large crude carriers. The presented hydroacoustic ships berthing aid system measures four distances of a ship to the jetty using the sonar echo method. The system computer calculates the bow and stern speed and distances to dolphins from the measured data. The results obtained are simultaneously presented on a large, high luminance display as well as printed out and recorded on computer discs. Additionally the dolphins displacements are measured and the data obtained together with its statistical parameters are recorded.
    Źródło:
    Hydroacoustics; 1997, 1; 237-242
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic control of the receiving beam horizontal cross-section in the side scan sonar
    Autorzy:
    Jedel, A.
    Kilian, L.
    Marszal, J.
    Ostrowski, Z.
    Salamon, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/332725.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    A decade old side scan sonars are now being modernised by way of dynamically controlling the width of the receiving beam in the horizontal cross-section. The result is a quasi-constant linear resolution of the sonar (replacing constant angular resolution), when it picks up echo signals as it moves further away from the targets. The advantage of the treatment is that the ship using the side scan sonar can increase its speed without risking the loss of near targets’ echo. The articles describes how the system of dynamic control was implemented. Special TVG systems were introduced to control dynamic signal gain from several separate sections of the sonar’s acoustic array, which was divided symmetrically into unequal sections. The location of these systems in the sonar’s receiver is presented. Examples are given of curves that control TVG and of the effects of dynamic horizontal stabilisation of the sonar’s linear resolution as it receives signals.
    Źródło:
    Hydroacoustics; 2005, 8; 69-76
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Tytuł:
    Method for improving multibeam sonar bearing accuracy
    Autorzy:
    Leśniak, W.
    Marszal, J.
    Salamon, R.
    Zachariasz, K.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332790.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    multibeam sonar
    sonar bearing accuracy
    sonars
    Opis:
    The paper presents a simple method for improving multibeam sonar bearing accuracy. The principle proposed here is similar to the monopulse method, a solution commonly used in radars and sonars. With no manual or automatic beam rotation, the method offers a substantial reduction in the demand for sonar computational effort. It significantly reduces bearing error for a relatively high signal to noise ratio. The paper gives a boundary value of the output signal to noise ratio which when exceeded satisfactorily improves bearing accuracy.
    Źródło:
    Hydroacoustics; 2009, 12; 98-108
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Microphytobenthos Photosynthesis on the Characteristics of the Echo Signal from Baltic Sandy Sediments
    Autorzy:
    Gorska, N.
    Kowalska-Duda, E.
    Marszal, J.
    Schmidt, J.
    Klusek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/177331.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hydroacoustics
    backscattering
    microphytobenthos photosynthesis
    Baltic Sea
    Opis:
    The understanding the influence of biological processes on the characteristics of the signals backscattered by the sea floor is crucial in the development of the hydroacoustical benthic habitat classification techniques. The impact of the microphytobenthos photosynthesis on the acoustical backscattering properties of the Atlantic sandy sediments was previously demonstrated by Holliday et al. (2004) and Wildman and Huettel (2012). To account for the sensitivity of the hydroacoustical classification techniques to the backscattering properties of local marine sediments, it is important to understand the microphytobenthos photosynthesis impact for the Baltic Sea where the techniques are being actively developed now. This is the main motivation of the paper. In the paper the influence of the microphytobenthos photosynthesis on the characteristics of the echo signals reflected by sandy sediments in the typical Baltic temperature and the salinity conditions is discussed. The interdisciplinary multiday laboratory experiment was conducted to study the impact of benthic microalgal photosynthesis on the characteristics of the echo signal reflected by sandy sediments. Hydroacoustical data were collected under controlled constant light, temperature and salinity conditions. The oxygen content at different levels of the water column was simultaneously monitored.
    Źródło:
    Archives of Acoustics; 2015, 40, 3; 395-405
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Tytuł:
    Hydrographic echosounder for sounding inland waters
    Autorzy:
    Jedel, A.
    Kilian, L.
    Marszal, J.
    Ostrowski, Z.
    Wojan, Z.
    Zachariasz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/332033.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    This article describes a new echosounder model designed specifically for institutions responsible for the management of inland waterways, artificial and natural reservoirs, and marine coastal waters. The basic requirement related to the need of sounding shallow waters is measuring the smallest possible depths. Using separate transducers (sending and receiving) and attenuating them, and introducing a high dynamic range TVG circuit allowed the measurement of depths from 20cm at a maximum range of 100m. Water temperature is measured in order to include sound velocity corrections. The echosounder is manufactured using modern technology, with a PC 104 computer, robust FLASH memory emulating a hard disk, 8 inch color LCD panel, thermal printer with paper band for instant profile printouts, and a floppy disk drive for permanent storage. The echosounder interfaces to GPS.
    Źródło:
    Hydroacoustics; 2004, 7; 89-96
    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:
    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
    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
    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:
    Quality house application with taking into consideration client’s satisfaction
    Autorzy:
    Rosak-Szyrocka, J.
    Marszał, A.
    Konofalska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/114968.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    quality
    satisfaction
    client
    satysfakcja konsumenta
    metoda QFD
    jakość
    zarządzanie jakością
    Opis:
    From an enterprise point of view global market of these days can be characterized as highly demanding and competitive, and at the same time frequently changeable. To survive on such market, enterprise needs to satisfy customers regarding the quality, price and delivery time. Quality is one of the key elements that currently affect the application of the organization in the market. Quality and its management ensuring have long ceased to be the domain of only a handful of top organizations. Paper shows the using and benefits of QFD method.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2016, 2 (5); 45-55
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biochemiczna ocean poziomu ołowiu we włosach populacji mieszanej Cz. I. Badania wstępne
    Biochemical determination of lead in the hair in a mixed population Part. I. Preliminary study
    Viokhimicheskaja ocenka soderzhanija svinca v volosakh ljudejj iż smeshannojj populjacii Ch. I. Predvalitelnye issledovahija
    Autorzy:
    Skorkowska-Zieleniewska, J.
    Symonowicz, H.
    Marszal, P.
    Szotowa, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/872382.pdf
    Data publikacji:
    1983
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    olow
    wlosy
    populacje
    populacje mieszane
    badania
    biochemia
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 1983, 34, 2
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biochemiczna ocean stanu odżywienia magnezem i cynkiem niemowląt i dzieci. Badania wstępne
    Biochemical assessment of magnesium and zinc intake by infants and children.Preliminary investigations
    Biokhimicheskaja ocenka stepeni obespechenija potrebnostejj v magnie i linke u mladencev i detejj. Predvaritelnye issledovanija
    Autorzy:
    Skorkowska-Zieleniewska, J.
    Wachnik, Z.
    Symonowicz, H.
    Marszal, A.
    Szotowa, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/878049.pdf
    Data publikacji:
    1983
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    cynk
    magnez
    niemowleta
    dzieci
    biochemia
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 1983, 34, 3
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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