Temat: hydroacoustic system

Skocz do pozycji: 1.

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.
Tematy:: codend model
hydroacoustic system
fishing gear; Pokaż więcej
Wydawca:: Polskie Towarzystwo Akustyczne
Powiązania:: https://bibliotekanauki.pl/articles/331608.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 2.

Tytuł:: Hardware implementation of parametric algorithm for asynchronously gathered measurement data based on the FPGA technology
Autorzy:: Janowski, T.
Szworski, K.
Zając, R.
Tematy:: hardware implementation
FPGA technology
hydroacoustic system; Pokaż więcej
Wydawca:: Polskie Towarzystwo Akustyczne
Powiązania:: https://bibliotekanauki.pl/articles/332532.pdf Link otwiera się w nowym oknie
Opis:: The hydroacoustic system based on DOA estimation utilizes passive antenna composed of many hydrophones. The samples of the arriving acoustic signal must be gathered synchronously from each hydrophone. This enables to take advantage of parametric processing signals methods. These methods make possible determination of the amplitude and the phase relationship among particular hydrophones. The newest complex systems made up of many sub modules uses network solutions. In the case of Ethernet network some standards (e.g. Precision Time Protocol) are defined to enable synchronization of the data (samples) gathered from many hydrophones by the clock synchronization. When the antenna consists of few hydrophones then the special concentrator connected point-to-point to hydrophones can be utilized. This article discusses the issue related to PTP as well as concentrator based on FPGA technology, which uses simple UDP protocol. In the case of concentrator the synchronous method of the I/Q detection which not requires synchronous samples acquisition is also presented.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: Influence of protective hydrophone housing on its receiving sensitivity
Autorzy:: Kula, S.
Józwiak, R.
Tematy:: calibration
hydrophone
protective housing
hydroacoustic monitoring system; Pokaż więcej
Wydawca:: Polskie Towarzystwo Akustyczne
Powiązania:: https://bibliotekanauki.pl/articles/332149.pdf Link otwiera się w nowym oknie
Opis:: The purpose of the carried-out examinations was to verify the receiving sensitivity of the hydrophone placed inside a protective housing. In order to increase resistance to damage, the hydrophone Reson TC4032 has been adapted to work in difficult environmental conditions. Using a comparative method, we analyzed the receiving sensitivity within a predetermined frequency band. The experiment was carried with two hydrophones: the examined one, and a reference one. An underwater speaker with a function generator was used as the sound source. The studies have been conducted in a water tank under laboratory conditions. In situ studies have determined the decrease of the receiving sensitivity of the hydrophone equipped with the protective housing.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: An Autonomous Hydroacoustic System for studying long-term scattering variability
Autorzy:: Szczucka, J.
Groza, K.
Porazinski, K.
Tematy:: marine acoustics
bottom
Autonomous Hydroacoustic System
vertical migration
scattering
sea surface
Baltic Sea
water column; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/48119.pdf Link otwiera się w nowym oknie
Opis:: A new instrument, an Autonomous Hydroacoustic System, was designed to probe a water column acoustically from the bottom to the sea surface. It is capable of operating from a depth of 100 m self sufficiently for up to 10 days. A brief description of its construction and electronic design is provided. Preliminary results from the first field study consisting of a 90-hour series of backscattering measurements are presented.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Underwater objects’ detection system choice for harbor surveillance purposes
Wybór systemu detekcji obiektów podwodnych dla potrzeb hydroakustycznego systemu kontroli dna akwenów portowych
Autorzy:: Zwolak, K.
Tematy:: harbor surveillance system
hydroacoustic systems
hydrographic equipment
ochrona portu morskiego
systemy hydrograficzne
urządzenia hydrograficzne; Pokaż więcej
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Powiązania:: https://bibliotekanauki.pl/articles/221899.pdf Link otwiera się w nowym oknie
Opis:: The paper presents an analysis of various hydrographic systems, in order to find the most suitable set of equipment for hydroacoustic harbor surveillance system. Singe beam and multibeam echosounders, sweep systems, sidescan sonars, scanning sonars, interferometric sonars and underwater vehicles were analyzed in terms of their usefulness for mentioned purpose. The preferred hydroacoustic systems were chosen based on the analysis results.
W artykule przedstawiono analizę różnorodnych systemów hydrograficznych pod kątem możliwości ich wykorzystania w hydroakustycznym systemie kontroli dna akwenów portowych. Analiza obejmuje echosondy jedno- i wielowiązkowe, systemy wieloprzetwornikowe, sonary boczne i skanujące, sonary interferometryczne oraz pojazdy podwodne. W oparciu o ich charakterystykę i sposób użycia wskazano systemy hydroakustyczne preferowane do detekcji obiektów w ramach kontroli dna akwenów portowych.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Capabilities to use passive measurement systems to detect objects moving in a water region
Autorzy:: Mironiuk, Waldemar
Buszman, Krystian
Tematy:: sea transport safety
underwater observation system
ship detection
ship classification
hydroacoustic parametrization
bezpieczeństwo transportu morskiego
system obserwacji podwodnej
detekcja statku
klasyfikacja statków
parametryzacja hydroakustyczna; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/27322537.pdf Link otwiera się w nowym oknie
Opis:: The increase in the use of sea water is the basis for the development of the existing security systems in given areas. Monitoring the navigational situation in a given water area is one of the most important tasks aimed at ensuring the necessary level of safety in maritime traffic. Marine surveillance systems at sea are used for this purpose. As an interesting approach related to the study of the movement of vessels, this paper proposes a method based on the measurement of physical field disturbances generated by objects moving in the sea water. These disturbances can be referred to the upper (air space) and lower (underwater) hemisphere. In the upper hemisphere the motion of the object generates disturbances of the thermal field while in the lower hemisphere disturbances of the acoustic, hydrodynamic, magnetic, electric and seismic fields are generated. Detection of the floating objects and determination of movement parameters is realized mainly by active systems. There are radiolocation systems in the upper hemisphere (radar systems) and echo ranging systems in the lower hemisphere (sonars and echosounders). Monitoring of the upper hemisphere of sea vessels traffic is conducted in a comprehensive manner. The lower hemisphere is in the most cases omitted. Therefore, it is recommended to develop underwater observation systems as a source of additional information about floating objects and thus complement the existing systems used in navigation. However, at present, de spite the technological progress, there is a noticeable lack of the comprehensive solutions in the area of monitoring the vessels movement in the underwater space. Therefore, appropriate action should be taken to recognize this technology gap and increasing the safety of vessel traffic. The aim of the article was to present a fully passive, mobile underwater observation system that uses a number of sensors to monitor the underwater environment parameters, the research methodology and analysis of the obtained results. The method of deploying the measurement system at the selected geographical position and the measurement method are described. Based on obtained results, the analysis of sound pressure disturbances caused by passing ships was performed. A feature extraction method was developed to identify a passing vessel based on low frequency signal parameters.
Dostawca treści:: Biblioteka Nauki

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