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    Wyświetlanie 1-23 z 23
    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:
    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:
    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:
    Application of Shape From Shading Technique for Side Scan Sonar Images
    Autorzy:
    Bikonis, K.
    Moszynski, M.
    Lubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/258963.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    side scan sonar data processing shape from shading
    Opis:
    Digital signal processing technology has revolutionized a way of processing, visualisation and interpretation of data acquired by underwater systems. Through many years side scan sonars were one of the most widely used imaging systems in the underwater environment. Although they are relatively cheap and easy to deploy, more powerful sensors like multibeam echo sounders and sonars are widely used today and deliver 3D bathymetry of sea bottom terrain. Side scan sonar outputs data usually in a form of grey level 2D acoustic images but the analysis of such pictures performed by human eye allows creating semi-spatial impressions of seafloor relief and morphology. Hence the idea of post-processing the side scan sonar data in a manner similar to human eye to obtain 3D visualisation. In recently developing computer vision systems the shape from shading approach is well recognized technique. Applying it to side scan sonar data is challenging idea used by several authors. In the paper, some further extensions are presented. They rely on processing the backscattering information of each footprint (pixel in sonar image) along with its surroundings. Additionally, a current altitude is estimated from the size of shadow areas. Both techniques allow constructing 3D representation of sea bottom relief or other investigated underwater objects.
    Źródło:
    Polish Maritime Research; 2013, 3; 39-44
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    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:
    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:
    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:
    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:
    Acoustic imaging of selected areas of Gdansk Bay with the aid of parametric echosounder and side-scan sonar
    Autorzy:
    Grelowska, G.
    Kozaczka, E.
    Szymczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/963410.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    echolocation
    acoustic imaging
    seabed structure examination
    Opis:
    The article presents and analyses the data recorded during sounding of the Gdansk Bay seabed with the aid of a parametric echosounder and a side-scan sonar. The accuracy of seabed structure examination, as a condition for obtaining valuable results, requires correct configuration of echolocation devices and proper calibration of peripheral devices, such as the survey unit geographical position sensor – GPS, the navigation unit, the MRU-Z sensor of pitch, roll and heave, and the sound velocity meter, which deliver the data to the bathymetric measurement system. Parametric seabed profilers deliver two types of data: the envelope, and the detailed echo signal without processing. The envelope is used for data visualisation in the form of online echograms, while the echo signal is stored for further analyses, to be performed using dedicated software or, after relevant conversion, in arbitrary programming environment1. The presented data analysis is illustrated by selected sample images recorded by the parametric echosounder and the side-scan sonar during Gdansk Bay sounding.
    Źródło:
    Polish Maritime Research; 2017, 4; 35-41
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    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
    Tytuł:
    A new map of the Neva Bay bottom sediments and technogenic objects under the result of side-scan sonar profiling
    Autorzy:
    Spiridonov, M. A.
    Ryabchuk, D. V.
    Kropachev, Y. A.
    Nesterova, E. N.
    Zhamoida, V. A.
    Vallius, H.
    Kotilainen, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1204986.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    side-sonar investigations
    sedimentary processes
    Neva Bay
    Opis:
    In summer 2004, Department of Marine and Environmental Geology of VSEGEI carried out investigations of the Neva Bay bottom surface east of the St. Petersburg Flood Protective Dam using a side-scan sonar system. The main aim of this experimental work was the creation of a new “factographical” map of bottom sediments and different types of technogenic objects. State geological surveys of the Neva Bay bottom were carried out by VSEGEI in 1987–1989. Besides, geoenvironmental investigations were conducted here in 1993–1995 and 2000–2002. As a result, a set of maps of bottom sediments based on hundreds of sampling stations (both cores and grab-sampler) were compiled. Side-scan investigations of 2004 allowed more exact recognition of the bottom sediment distribution. Furthermore, in some places new data permit to suppose that the sedimentary conditions have changed here during the last decades as a result of high technogenic load, including Flood Protective Dam influence. In summer 2004 there were a joint expedition of the VSEGEI and the Geological Survey of Finland (GTK). Altogether 10 sampling stations from the mud accumulation areas were sampled with a use of Niemisto corer. Cores were sliced in 1 cm samples and analyzed in chemistry laboratory of GTK (Finland) – gamma spectrometry for 137Cs, ICP-AES and ICP-MS, whereupon important results about heavy metals concentration and distribution were received.
    Źródło:
    Polish Geological Institute Special Papers; 2008, 23; 95-107
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the accuracy of shoreline mapping in inland navigational charts (Inland ENC) using photogrammetric and sonar images
    Autorzy:
    Łubczonek, Jacek
    Łącka, Małgorzata
    Zaniewicz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/134946.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    photogrammetry
    navigation chart
    hydrography
    side scan sonar
    accuracy assessment
    mapping
    Opis:
    Shoreline mapping is one of the key stages in navigational charting. In terms of navigation, the shoreline marks the boundary of a river, which is often equivalent to the navigable water area. In cartographic terms, it is an important topological element between different objects that are adjacent to it. Currently, topographic objects are often mapped using photogrammetric materials obtained from various altitudes – satellite, airborne or low, which is associated with the use of an airborne UAV. Depending on the type of materials, the shoreline can be obtained in vector form with differing situational accuracy and differing degree of detail. In addition to the standard methods of processing vector data, the research in this paper also included the use of sonar images, enabling the detection of the shoreline with the use of a surveying hydrographic unit. On the basis of the collected photogrammetric and sonar images of different spatial resolution, an analysis of the accuracy of shoreline mapping was performed in terms of the situational accuracy and the level of detail in its representation. The results of the research provided the basis for the determination of dedicated remote sensing materials enabling the development of maps for inland navigation.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 58 (130); 45-54
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    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:
    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:
    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:
    Automatyczna detekcja obiektów sonarnych
    Automatic detection on sonar objects
    Autorzy:
    Wąż, M.
    Grządziel, A.
    Nowak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/972124.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Przyrodniczy we Wrocławiu
    Tematy:
    pomiary hydrograficzne
    sonar boczny
    obraz sonarowy
    detekcja obiektów
    hydrographic survey
    side scan sonar
    sonar imagery
    object detection
    Opis:
    Współczesne systemy sonarowe wykorzystywane są głównie do poszukiwania i wykrywania obiektów podwodnych, które mogą wpłynąć na bezpieczeństwo pływania i postoju jednostek pływających. Zadaniem operatora takich systemów jest optymalne ustawienie zobrazowania oraz odpowiedni dobór parametrów operacyjnych umożliwiających detekcję ech a następnie identyfikację wykrytych celów. Operator dokonuje korekty uzyskanych danych sonarowych, poprawiając tym samym jakość zobrazowania i możliwości interpretacji wyników pomiarów. W artykule rozpatrywanym problemem badawczym jest przekształcanie obrazów, dokonywanie korekcji geometrycznej oraz ekstrakcja obiektów z tła obrazu sonarowego. Zaprezentowana metoda automatycznego wyszukiwania obiektów wykorzystuje cechy morfologiczne sonogramów oraz geometryczne i arytmetyczne metody przetwarzania sygnałów stosowane do obróbki i analizy obrazów cyfrowych. Na etapie wyszukiwania cech obiektów sonarowych wykorzystano metody minimalno-odległościowe stosowane w rozpoznawaniu obrazów. Opracowana aplikacja umożliwiła przeprowadzenie eksperymentu badawczego przedstawiającego kolejne etapy detekcji obiektów sonarowych. Otrzymane wyniki mogą wskazywać na poprawność przyjętych założeń do badań oraz poprawność ich przeprowadzenia.
    Contemporary sonar systems are used mainly to search for and detect underwater objects which might affect the safety of navigation or the safety of moored watercraft. The task of the sonar operator is to display the optimal settings of the sonar image and to select the proper operational parameters that enable detection and identification of hidden targets. The operator performs corrections of the recorded sonar data, thereby improving the image quality and the ability to interpret the survey results. The paper deals with the research problem of changing display images, conducting geometric corrections, and extracting objects from the sonar imagery background. The presented method for the automatic searching of objects utilizes the morphologic features of sonograms and geometric and arithmetic methods of digital signal processing. In searching for the features of a sonar target, the minimal-distance methods used in pattern recognition were applied. The developed application makes it possible to perform research experiments that follow the stages of sonar detection of objects. The obtained results can indicate the validity of the research assumptions and the appropriateness of the methods used.
    Źródło:
    Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum; 2013, 12, 1; 29-41
    1644-0668
    Pojawia się w:
    Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conditions for multiple acquisition of echoes from stationary targets in successive transmissions of active sonars
    Autorzy:
    Kilian, Lech
    Schmidt, Aleksander
    Rudnicki, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/24201958.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    echosounder
    sonar
    side scan sonar
    multiple echo
    beam geometry
    scanning speed
    echosonda
    sonar boczny
    echo wielokrotne
    geometria belki
    prędkość skanowania
    Opis:
    In echolocation, the highest possible number of contacts with a detected target is clearly decisive on the possibilities of echo processing to optimise the estimation of distinctive characteristics of the observed target. In hydrolocation, the slow propagation of acoustic waves in water reduces the number of contacts of echosounders and sonars with detected targets. The article considers model conditions for acquiring multiple contacts with stationary targets detected by various sounding methods - with echosounders, classic active sonars and side looking sonars. Appropriate formulas explicitly linking the possible number of echo signals from the target in a specific geometry of the survey performed at the assumed speed are presented. These formulas are intuitively clear and not very complicated, but their value lies in the ability to instantly combine the vessel speed with the sounding effects, and may be a clear argument for imposing a low sounding speed, which make it difficult to steer the vessel.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022308
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automated approach to classification of mine-like objects using multiple-aspect sonar images
    Autorzy:
    Wang, X.
    Liu, X.
    Japkowicz, N.
    Matwin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/91790.pdf
    Data publikacji:
    2014
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    object
    sea bed
    multiple side-scan sonar
    Dempster-Shafer theory
    DS concept
    classifier
    imbalance
    imbalanced problem
    multi-instance class
    Opis:
    In this paper, the detection of mines or other objects on the seabed from multiple side-scan sonar views is considered. Two frameworks are provided for this kind of classification. The first framework is based upon the Dempster–Shafer (DS) concept of fusion from a single-view kernel-based classifier and the second framework is based upon the concepts of multi-instance classifiers. Moreover, we consider the class imbalance problem which is always presents in sonar image recognition. Our experimental results show that both of the presented frameworks can be used in mine-like object classification and the presented methods for multi-instance class imbalanced problem are also effective in such classification.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 2; 133-148
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D seafloor reconstruction using data from side scan and synthetic aperture sonar
    Autorzy:
    Bikonis, K.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/331896.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    seafloor reconstruction
    underwater environment
    seafloor
    Opis:
    Side scan and synthetic aperture sonars are widely used imaging systems in the underwater environment. They are relatively cheap and easy to deploy, in comparison with more powerful sensors, like multibeam echosounders. Although side scan and synthetic aperture sonars does not provide seafloor bathymetry directly, their records are finally related to seafloor images. Moreover, the analysis of such images performed by human eye allows creating semi-spatial impressions of seafloor images obtained from side scan sonar echograms. In the paper, some techniques for 3D seafloor shape reconstruction from side scan and synthetic aperture sonars are presented. They are based on Shape From Shading (SFS) approach, which is one of classical problems in computer vision. The method for reconstruction of 3D seafloor relief using the information from both the currently processed and previous ping is presented. The advantage of the presented methods is their simplicity and the ability to produce the results within sequential, i.e. “one run” processing of side scan sonar image. Another algorithm relies on estimating the altitude gradient of the insonified surface from sonar data, combined with the use of dimension of shadow areas for estimation of the current elevation change. The presented results are promising and also show to some extent how the performance of the proposed algorithm might be improved in further investigation.
    Źródło:
    Hydroacoustics; 2010, 13; 25-30
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-23 z 23

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