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    Wyświetlanie 1-11 z 11
    Tytuł:
    The Doppler effect in a bistatic system for determining the position of moving targets
    Autorzy:
    Ostrowski, Z. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331848.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The article presents the theoretical analysis and the results of numerical calculations of the Doppler effect it occurs in a system designed to determine the position and speed of a moving target. The transmitter is the source of the signal and it emits a sinusoidal, acoustic and continuous wave. Signal reflected off a moving target is received by four hydrophones. Based on the signals, four Doppler shifts are determined and inserted into a set of equations. The solution gives instantaneous target coordinates and the vector of target speed. Analytical formulas are given which describe the spectra of the Doppler shift of echo signals in a bistatic system, as well as numerically determined examples. Spectral lines are assigned to instantaneous target positions. This provides the basis for solving the above set of equations and the functioning of the system.
    Źródło:
    Hydroacoustics; 2014, 17; 161-170
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Receiver of Doppler multistatic system for moving target detection and tracking
    Autorzy:
    Ostrowski, Z. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332810.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    positioning system
    Doppler shift
    homodyne detection
    Opis:
    The article presents a method for solving major structural problems that occur in the receiver used in the multistatic Doppler system, aimed at determination of the trajectory and velocity of a moving target. In the system two transmitters emit acoustic continuous sinusoidal waves at different frequencies. The signals, scattered from a moving target are received by four hydrophones. Beside of the echoes, much larger signals coming directly from transmitters are recorded. It has been proved that in the presence of the direct high-amplitude signal, using currently available A/D converters, there is no possibility to detect the Doppler shift of small signals. The proposed approach is based on the homodyne frequency conversion of the received signals. Subsequently, the constant component and other unwanted products of the frequency conversion are filtered. The results of computer simulation have shown the effectiveness of the adopted design solution.
    Źródło:
    Hydroacoustics; 2015, 18; 141-152
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Special forms of echo visual representation in an ahead looking sonar
    Autorzy:
    Raganowicz, A.
    Kilian, L.
    Ostrowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331664.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The paper discusses ways to organise visual representation in a multi-beam ahead looking sonars whose function is to detect objects on the bottom and in pelagic zones. Forms of visual representation are shown and illustrated on the basic screen (panoramic representation and setting, alarms) and on the auxiliary screen (type A, B and special). Special forms of visual representation are mainly used in detecting objects in difficult hydrological conditions and when classifying objects. Several types of visual representations are shown, including a historical data example, multiplied type A representation in multiple beams and two types of quasi-spatial displays.
    Źródło:
    Hydroacoustics; 2002, 5; 47-52
    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:
    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:
    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:
    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:
    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:
    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
      Wyświetlanie 1-11 z 11

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