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Wyszukujesz frazę "Marszal, J." wg kryterium: Autor


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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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

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