Wszystkie pola: Salamon, Roman - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Noise effect on parameters of quiet sonar with code modulation
Autorzy:: Salamon, Roman
Marszal, Jacek
Jedel, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/24201997.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: silent sonar
maximum length sequence
signal-to-noise ratio
frequency modulation
cichy sonar
sekwencje o maksymalnej długości
stosunek sygnału do szumu
modulacja częstotliwości
Opis:: Earlier publications of the paper authors have shown that the use of code keying mixed with the CW FM sound signal allows the significant reduction in the distance measurement error, compared to classic silent CW FM sonar. In addition to the code modulation parameters, the magnitude of this error is influenced by the received input acoustic noise. The article shows the dependence of the input signal-to-noise ratio and the sound signal parameters on the target distance measurement error and the detection conditions, such as the output signal-to-noise ratio and the side lobe level. The results of the analysis were compared to the same parameters of the CW FM silent sonar without code modulation.
Źródło:: Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023109
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Impact of Spatial Noise Correlation on Bearing Accuracy in DIFAR Systems
Autorzy:: Rudnicki, Mariusz
Marszal, Jacek
Salamon, Roman
Powiązania:: https://bibliotekanauki.pl/articles/1953524.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: underwater noise
noise correlation
DIFAR sonobuoys
bearing accuracy
Opis:: DIFAR type underwater passive systems are one of the more commonly used tools for detecting submarines. At the design stage, which usually uses computer simulations, it is necessary to generate acoustic noise of the sea. It has been shown that correlating noise significantly reduces these errors compared to the assumption that noise is uncorrelated. In addition, bearing errors have been shown to be the same in systems with a commonly used antenna containing five hydrophones, as in a system without a central hydrophone, which may be useful in some DIFAR system design solutions.
Źródło:: Archives of Acoustics; 2020, 45, 4; 709-720
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Numerical Model of Surface and Quasi-Spherical Sea Noise and Its Application to Analysis of DIFAR Systems
Autorzy:: Rudnicki, Mariusz
Salamon, Roman
Marszal, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/2097703.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: numerical model
surface sea noise
quasi-spherical sea noise
DIFAR
bearing error
Opis:: Various types of passive sonar systems are used to detect submarines. These activities are complex and demanding. Therefore, computer simulations are most often used at the design stage of these systems. For this reason, it is also necessary to simulate the acoustic ambient noise of the sea. The article proposes a new numerical model of surface and quasi-spherical sea noise and presents its statistical parameters. The results of the application of the developed noise model to analyse the received signals of the DIFAR1 sonobuoy are also presented.
Źródło:: Archives of Acoustics; 2021, 46, 4; 591-604
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Underwater navigation system based on Doppler shift – measurements and error estimations
Autorzy:: Ostrowski, Zawisza
Salamon, Roman
Kochańska, Iwona
Marszal, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/260234.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: underwater acoustics
navigation systems
Doppler shifts
Opis:: A new acoustic navigation system was developed to determine the position and speed of moving underwater objects such as divers and underwater vehicles. The path of an object and its speed were determined by the Doppler shifts of acoustic signals emitted by a transmitter placed on the object and received by four hydrophones installed at the periphery of the monitored body of water. The position and speed measurements were affected by errors mainly caused by acoustic reflections (returns) from the water body boundaries and surface reverberations. This paper discusses the source of the disturbances with the results of a simulation test and experimental measurements. It was demonstrated that the magnitude of the errors could be acceptable in most of the potential applications of the acoustic navigation system.
Źródło:: Polish Maritime Research; 2020, 1; 180-187
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

Artykuł

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