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Tytuł:
Wykrywanie i lokalizowanie obiektów podwodnych sonarem bocznym jako element bezpieczeństwa żeglugi
Detection and localization of underwater objects with side scan sonar as a safety of navigation element
Autorzy:
Grządziel, A.
Nowak, D.
Wąż, M.
Powiązania:
https://bibliotekanauki.pl/articles/313349.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
sonary
sonar boczny
bezpieczeństwo żeglugi
sonars
side sonar
shipping safety
Opis:
W artykule omówiony został aspekt wykrywania i lokalizowania obiektów podwodnych za pomocą hydrograficznego sonaru bocznego. Zwrócono uwagę na możliwość wykorzystania sonarów przeznaczonych do badań hydrograficznych w operacjach poszukiwania i detekcji obiektów minopodobnych. Dokonano ogólnej charakterystyki techniki sonarów bocznych zwracając szczególną uwagę na zalety i wady dwóch wariantów. W artykule zamieszczono wyniki wybranych prac sonarowych wykonanych z pokładu okrętu hydrograficznego ORP Arctowski.
The article discusses the detection and localization of underwater objects with hydrographic side scan sonar. Attention was drawn to the possibility of using SSS technique in searching of mine-like objects MLO. Hull-mounted sonar and towed side scan sonar have been characterized, their advantages and disadvantages. The paper presents the results of selected sonar surveys performed on board the hydrographic ship ORP Arctowski.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 140-143, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visualisation forms in MCM side scan sonar
Autorzy:
Kilian, L.
Raganowicz, A.
Sidorko, T.
Powiązania:
https://bibliotekanauki.pl/articles/331945.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The article discusses forms of visualisation on the monitors of an MCM side scan sonar with towbody modernised by the DMES. The introduction gives an overview of the structure of the sonar, how it collects signals and the nature of the signals. This forms the basis for how the signals are visualised. Next a description is given of other factors which determine the form of visualisation on the sonar’s monitors. They are the operator’s tasks and the display of the settings, the readings of additional sonar sensors, how the system cooperates with other onboard systems, operator training and ergonomics. Examples of visualisation are included.
Źródło:
Hydroacoustics; 2010, 13; 119-126
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and wavelet analysis of side-scan sonar sea bottom imagery
Autorzy:
Tęgowski, J.
Zieliński, A.
Powiązania:
https://bibliotekanauki.pl/articles/332396.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
A backscattered side-scan sonar signal contains indirect information about the scattering surface, namely, the bottom sediment, character of bottom surface, and seafloor relief. This paper presents a method of automatic estimation of height of seafloor characteristic objects and micro relief reconstruction applying the measured shadow length. The proposed method utilises coefficients of two-dimensional discrete wavelet decomposition of a side-scan sonar image as the input to the self-organised neural network classification algorithm. The heights of seafloor characteristic objects were the basis for synthesis of a three-dimensional map of the bottom surface. The computations were conducted for data recorded in Hornsund Fjord (Spitsbergen Island, Svalbard Archipelago) during a habitat mapping experiment and for synthetic data. The verification of the proposed algorithm was made by comparison of computed results with calibrated video recordings.
Źródło:
Hydroacoustics; 2006, 9; 199-208
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Submarine landslides on the slope of a sandy barrier : A case study of the tip of the Hel Peninsula in the Southern Baltic
Autorzy:
Rudowski, R.
Rucińska-Zjadacz, M.
Wróblewski, R.
Sitkiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059851.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
underwater mass movements
sandspit
digital terrain model (DTM)
side-scan sonar
sub–bottom profiling
Opis:
The aim of the study is to present the occurrence of landslides on the submarine slope of a sandy barrier. The scale and significance of this phenomenon is discussed. The study area is the Hel Peninsula. It is a 35 km long young sandy spit. The landform is prograding into the deep part of Gdańsk Bay, and the underwater extension of its tip is a steep sandy slope. The tip is still poorly investigated, as it was a military area closed to researchers until 2003. The first detailed survey of the tip on the seabed was conducted aboard the research vessel “IMOR”. A multibeam echosounder, a sub-bottom profiler and a side-scan sonar were used, while grab and core samples of sediment were obtained. Many forms, commonly created as the result of underwater mass movement, were recognized and determined (main scarps, main bodies, landslide steps, landslide foots, series of small slides, “sheet” slides and structural slides). On the one hand, the landslide processes that occur in the tip of the Hel Peninsula are related to the natural development of sandy spits. On the other hand, they threaten the shore’s stability. The genesis of the landslides is still not known.
Źródło:
Geological Quarterly; 2016, 60, 2; 407--416
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seafloor relief reconstruction from side scan sonar data
Autorzy:
Łubiniewski, Z.
Bikonis, K.
Powiązania:
https://bibliotekanauki.pl/articles/332510.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Side scan sonar is one of the most widely used imaging systems in the underwater environment. It is relatively cheap and easy to deploy, in comparison with more powerful sensors. Although side scan sonar does not provide seafloor bathymetry directly, its records are directly related to seafloor images. In the paper, the method for 3D seafloor relief reconstruction from side scan sonar data is presented. The method is based on the Shape From Shading technique and for estimation of a bottom depth at a currently processed point, it uses the information from both currently processed and previous ping. The results obtained by several versions of the developed algorithm are presented. The obtained results are promising and also show how the performance of the proposed algorithm might be improved in further work.
Źródło:
Hydroacoustics; 2007, 10; 101-106
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-beam side-scan sonar
Autorzy:
Elminowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/332735.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Conventional single beam side-scan sonars with beams at about 1o are not well suited for the detection and identification of very small objects TS < -25 dB - e.g. minelike objects. Sonars of very high angular resolution at 0.1o - 0.2o operate in the nearfield and the speed of the sonar's transducer towing has to be reduced significantly. The paper presents a design approach to a multi-beam side-scan sonar where the above mentioned drawbacks have been removed. The sonar has several narrow parallel (not conical) beams simultaneously formed using the method of beam shaping in the nearfield. Two methods of beam shaping in the nearfield are presented. Thanks to them sonars of various quality and cost can be designed. Selected beam patterns for the two methods of beam forming in the nearfield are presented and compared.
Źródło:
Hydroacoustics; 2001, 4; 57-60
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mozaikowanie obrazów sonarowych wykonanych urządzeniami holowanymi
Side scan sonar image mosaicing
Autorzy:
Chorzewska, K.
Powiązania:
https://bibliotekanauki.pl/articles/222436.pdf
Data publikacji:
2013
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
sonar boczny
sonogram
mozaikowanie
oprogramowanie hydrograficzne
side sonar
mosaicing
hydrographic software
Opis:
Obrazy sonarowe analizowane są zazwyczaj w dwóch podstawowych formach: tzw. widoku waterfall, najbliżej związanego z metodą ich pozyskiwania, oraz mozaiki, czyli kompilacji sonogramów z odniesieniem geograficznym. Utworzenie mozaiki sonarowej wymaga zastosowania wielu przekształceń oryginalnych danych. W artykule przedstawiono etapy tworzenia mozaiki sonarowej na przykładzie dwóch mechanizmów mozaikowania dostępnych w pakiecie oprogramowania Caris HIPS and SIPS. Omówiono efekty stosowania poszczególnych technik przetwarzania obrazu oraz wyboru konkretnej techniki mozaikowania.
Sonar images are usually analyzed in two basic forms: the so called waterfall, the most closely connected with the method used to obtain them, and the geo-referenced mosaic, i.e. A compilation of sonograms with geographic reference. To make a sonar mosaic requires using several transformations of original data. This paper presents the stages of making a sonar mosaic based on two examples of two mosaic mechanisms available in the software package Caris HIPS and SIPS. It discusses the results of using the respective techniques for processing an image, and selecting the particular mosaicing technique.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2013, R. 54 nr 4 (195), 4 (195); 5-30
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inversion of side scan sonar motion and posture in seabed geomorphology
Autorzy:
Tao, W.
Liu, Y.
Hu, H.
Powiązania:
https://bibliotekanauki.pl/articles/258774.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
side scan sonar
image matching
image fusion
neutral network
motion inversion
Opis:
Side scan sonar measurement platform, affected by underwater environment and its own motion precision, inevitably has posture and motion disturbance, which greatly affects accuracy of geomorphic image formation. It is difficult to sensitively and accurately capture these underwater disturbances by relying on auxiliary navigation devices. In this paper, we propose a method to invert motion and posture information of the measurement platform by using the matching relation between the strip images. The inversion algorithm is the key link in the image mosaic frame of side scan sonar, and the acquired motion posture information can effectively improve seabed topography and plotting accuracy and stability. In this paper, we first analyze influence of platform motion and posture on side scan sonar mapping, and establish the correlation model between motion, posture information and strip image matching information. Then, based on the model, a reverse neural network is established. Based on input, output of neural network, design of and test data set, a motion posture inversion mechanism based on strip image matching information is established. Accuracy and validity of the algorithm are verified by the experimental results.
Źródło:
Polish Maritime Research; 2017, S 2; 81-88
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of natural conditions on the imaging of the bottom of the Gdańsk Bay by means of the side scan sonar
Autorzy:
Witos-Okrasińska, D.
Grelowska, G.
Kozaczka, E.
Powiązania:
https://bibliotekanauki.pl/articles/258936.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
side scan sonar imaging
Gdańsk Bay seabed
refraction of sound ray in sea
influence of ship’s movement on the wave on underwater imaging
Opis:
The interest in underwater resources is the reason for the development of modern hydroacoustic systems, including side sonars, which find numerous applications such as: research of seabed morphology and sediment characteristics, preparation of sea sediment maps, and even in special cases of biocenoses such as sea grass meadows, detection of specific targets at the bottom such as shipwrecks, mines, identification of suitable sites for maritime infrastructure. Such applications require precise information about the position of the objects to be observed. Errors affecting the depiction of the bottom using hydroacoustic systems can be divided into errors associated with improper operation of measuring and support devices, systematic errors and random errors. Systematic errors result from the changing conditions prevailing in the analyzed environment affecting the measurement system. The errors affecting the correct operation of hydroacoustic systems can include: changing angle of inclination of the beam caused by the vessel’s movement on the wave or refraction connected to changes in the sound speed as the depth function.
Źródło:
Polish Maritime Research; 2018, S 1; 104-110
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of seabed geomorphologic features of Svalbard fjords using high-resolution side scan sonar
Autorzy:
Tęgowski, J.
Giżejewski, J.
Zieliński, A.
Powiązania:
https://bibliotekanauki.pl/articles/331637.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
Svalbard fjords
side scan sonar
sea bed
Opis:
This paper presents results of a study on the relationship between features of side scan sonar acoustic imagery of zones with active bedforms and geomorphologic seafloor characteristics. Acoustic measurements were conducted in Hornsund, a Svalbard fjord representing a periglacial environment with great intensity of morphodynamic processes and rapidly progressing changes of tidewater glaciers. Due to the intensity of these processes, Arctic fjords are the most promising areas to study the effects of climate change on the ecosystem. Acoustic identification of sedimentary structures and morphological forms created by currents and iceberg transport of glacier sediment away from the ice margin was performed. The spectral and fractal features of the recorded signals were analysed. The proposed analysis scheme allows identification of the morphodynamic active zones in the changing Arctic fjord environments. Measurements of acoustical features of seafloor surface were made during the 2006 Arctic cruise of r/v Oceania.
Źródło:
Hydroacoustics; 2008, 11; 401-411
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental evaluation of high frequency side scan sonar as object search and identification tool
Autorzy:
Łukaszewicz, D.
Rowiński, L.
Powiązania:
https://bibliotekanauki.pl/articles/332364.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Paper presents initial results o laboratory tests of the sonar selected as a short range tool for an underwater vehicle. It is intended for bottom located object search and identification. To evaluate sonar imaging capability expressed by its resolution, several parameters were investigated. First group of parameters regards the sonar itself, while the second regards an object material and dimensions and shape. Their cross-influence was investigated for different distances from hydrophone to an object of interest and different hydrophone elevation angles. Experiments were performed in a shallow water laboratory tank.
Źródło:
Hydroacoustics; 2006, 9; 109-118
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:
Determining hotspots of sonar targets related to chemical munitions dumped in Bornholm Deep and Gotland Deep using GIS
Autorzy:
Majcher, J.
Grabowski, M.
Bełdowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/332429.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
chemical warfare agents
side scan sonar
geographic information system
Opis:
According to the Helsinki Commission report from 1994 around 15000 tonnes of chemical warfare agents were dumped to the Baltic Sea after World War II as part of the demilitarization process of the former Nazi Germany. Continuing corrosion of metal encasements makes the dumped munitions a ticking time-bomb, which could potentially harm the whole Baltic Basin. The presented work addresses important aspects for a proper evaluation of the threat; side scan sonar survey data storage and analysis of a spatial distribution of the sonar targets potentially related to chemical weapons. The chosen software environment was GIS oriented. ESRI ArcGIS built-in tools were used to determine the hotspots of the targets on the official post-war munitions dumping sites; Gotland Deep and Bornholm Deep. The automation process of mapping in GIS was also proposed. Therefore, a holistic approach for digital mapping of the sonar targets related to dumped munitions was created.
Źródło:
Hydroacoustics; 2017, 20; 121-128
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
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