Wszystkie pola: Salamon, R. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A directional sonobuoy system for submarine detection
Autorzy:: Salamon, R.
Powiązania:: https://bibliotekanauki.pl/articles/332131.pdf
Data publikacji:: 2004
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: This article outlines the methods of detecting and locating submarines. Special attention is paid to the airborne system utilizing directional sonobuoys. The article discusses operating principles of such systems, a method of detecting and estimating the approach direction of the acoustic wave emitted by the vessel, and practical visualization methods. The article is related to the successful development of a Polish prototype of a directional sonobuoy acoustic system processor.
Źródło:: Hydroacoustics; 2004, 7; 195-208
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

Tytuł:: Determining the distribution of acoustic field intensity using the sound ray density method
Autorzy:: Gawrysiak, J.
Salamon, R.
Powiązania:: https://bibliotekanauki.pl/articles/331706.pdf
Data publikacji:: 2000
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: The article presents a numerical method for determining the intensity of sound. The method is based on surface density of sound rays. It assumes that a ray of sound carries a specific acoustic power. As a result, it is no longer necessary to determine intensity in caustics, especially given the fact that intensity determined in caustics using the method employed so far has an infinite value.
Źródło:: Hydroacoustics; 2000, 3; 99-104
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Application of parametric methods of power spectrum estimation in passive sonar signals classification
Autorzy:: Schmidt, J.
Salamon, R.
Powiązania:: https://bibliotekanauki.pl/articles/332824.pdf
Data publikacji:: 1999
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: The paper presents the signals classification method based on the parametric spectral analysis as applied to the passive sonar. The system's structure is discussed special emphasis is given to the procedure of features selection in which true poles are chosen. Attached are results of tests carried out to evaluate the applicability of parametric methods of spectral estimation for the purpose of creating acoustic portraits and their classification.
Źródło:: Hydroacoustics; 1999, 2; 145-150
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

Tytuł:: Code signals transmission using MFSK modulation in shallow waters
Autorzy:: Zachariasz, K.
Schmidt, J.
Salamon, R.
Powiązania:: https://bibliotekanauki.pl/articles/332705.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: The paper presents an acoustic system for the transmission of digital data in shallow coastal waters of which multi-path propagation and intense reverberations are characteristic. To ensure a small error probability of moderate speed transmission, the system uses corrective codes and a technique of incoherent modulation MFSK (Mufti Frequency Shift Keying). To synthesise the transmission signal, estimate the spectrum of the signal received and code and decode the channels, a DSP processor was used. The paper includes the results of a computer simulation in which the system was put to work in the presence of Gaussian noise. The system was tested in shallow coastal waters and the results are discussed in the paper.
Źródło:: Hydroacoustics; 2001, 4; 261-264
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Processing the complex signal in the acoustic processor of a sonobuoy system
Autorzy:: Raganowicz, A.
Rudnicki, M.
Salamon, R.
Powiązania:: https://bibliotekanauki.pl/articles/332675.pdf
Data publikacji:: 2005
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: The article presents digital methods for processing the complex signal in the acoustic processor of a sonobuoy. The overall system design and the complex signal are presented. Two alternative methods for signal processing are discussed: in the time domain and in the frequency domain. Block diagrams of the algorithms of both processing methods are included. The problems involved in the practical implementation of data analysis methods are discussed. The problems are produced by the phenomena occurring in the system’s analogue section and by the complexity of the computation related to how powerful the digital algorithms are. The computation errors in both methods are analysed. The advantages and disadvantages of the different signal processing methods are discussed, with emphasis on the practicality of the device. The advantage of the processing method in the frequency domain is explained. Graphic images of the results of both processing methods are included on the example of real signals received during the study.
Źródło:: Hydroacoustics; 2005, 8; 163-170
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

Tytuł:: OFDM modulation and adaptive equalization for underwater communications
Autorzy:: Kochańska, I.
Lasota, H.
Salamon, R.
Powiązania:: https://bibliotekanauki.pl/articles/332731.pdf
Data publikacji:: 2005
Wydawca:: Polskie Towarzystwo Akustyczne
Opis:: Transmission performances of a shallow underwater channel are limited due to multiple reflections of sound waves off the bottom and water surface, and to the non-stationarity caused mainly by water surface movement. In traditional narrowband telecommunication modems complex Decision Feedback Equalizers are used for minimizing the influence of intersymbol interferences caused by multipath propagation of sound waves. The article proposes adapting OFDM modulation and adaptive equalization based on Kalman filtration techniques for use in underwater communications system. The OFDM modulation is used in wideband ADSL telecommunication modems. The Kalman filtration algorithm is used for time-varying processes identification. The techniques were tested in simulation environment with promising results.
Źródło:: Hydroacoustics; 2005, 8; 77-82
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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