Temat: multibeam sonar - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: MEMS technology quality requirements as applied to multibeam echosounder
Autorzy:: Demkowicz, J.
Bikonis, K.
Powiązania:: https://bibliotekanauki.pl/articles/331722.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: MEMS
IMU
Multibeam Sonar
Opis:: Small, lightweight, power-efficient, and low-cost microelectromechanical system (MEMS) inertial sensors and microcontrollers, available in the market today, help reduce the instability of Multibeam Sonars. Current MEMS inertial measurement units (IMUs) come in many shapes, sizes, and costs — depending on the application and performance required. Although MEMS inertial sensors offer affordable, appropriately scaled units, they are not currently capable of meeting all requirements for accurate and precise attitudes, due to their inherent measurement noise. The article presents the comparison of different MEMS technologies, and their parameters regarding to the main application; namely, Multibeam Echo Sounders (MBES). The MEMS parameters’ quality are crucial for further MBES record- processing, the article presents the results of undertaken researches in that area, and the results are relatively positive for low-cost MEMS.
Źródło:: Hydroacoustics; 2016, 19; 75-82
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Method for improving multibeam sonar bearing accuracy
Autorzy:: Leśniak, W.
Marszal, J.
Salamon, R.
Zachariasz, K.
Schmidt, J.
Powiązania:: https://bibliotekanauki.pl/articles/332790.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: multibeam sonar
sonar bearing accuracy
sonars
Opis:: The paper presents a simple method for improving multibeam sonar bearing accuracy. The principle proposed here is similar to the monopulse method, a solution commonly used in radars and sonars. With no manual or automatic beam rotation, the method offers a substantial reduction in the demand for sonar computational effort. It significantly reduces bearing error for a relatively high signal to noise ratio. The paper gives a boundary value of the output signal to noise ratio which when exceeded satisfactorily improves bearing accuracy.
Źródło:: Hydroacoustics; 2009, 12; 98-108
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: On algorithm details in multibeam seafloor classification
Autorzy:: Łubniewski, Z.
Sęk, D.
Powiązania:: https://bibliotekanauki.pl/articles/331668.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: seafloor classification
multibeam sonar
sonar data processing
Opis:: Remote sensing of the seafloor constitutes an important topic in exploration, management, protection and other investigations of the marine environment. In the paper, a combined approach to seafloor characterisation is presented. It relies on calculation of several descriptors related to seabed type using three different types of multibeam sonar data obtained during seafloor sensing, viz.: 1) the grey-level sonar images (echograms) of the seabed, 2) the 3D model of the seabed surface which consists of bathymetric data, 3) the set of time domain bottom echo envelopes received in the consecutive sonar beams. The proposed methodology has been tested using field data records acquired from several bottom types in the Southern Baltic Sea. Using the examples of particular parameters, the influence on the specific manner and details regarding their calculation, i.e. the size of the applied current local window to a sonar image, on the obtained classification performance, is discussed.
Źródło:: Hydroacoustics; 2017, 20; 113-120
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Sea floor classification using multibeam sonar
Autorzy:: Łubniewski, Z.
Chybicki, A.
Powiązania:: https://bibliotekanauki.pl/articles/332796.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: sea floor classification
multibeam sonar
hydroacoustics
Opis:: The paper presents the method of seabed identification and classification using multibeam sonar echoes. The proposed approach is based on calculation of a set of parameters of an echo envelope. The parameters are extracted for each consecutive beam allowing the estimation of their dependence on the seafloor incident angle, and then the relation between seabed type and calculated echo parameters and its angular dependence is investigated. The paper concerns the experiment which has been carried out in Gdansk Bay in November 2008, and some comparisons of the results with those obtained during previous experiment in September 2007. The results for several bottom types are presented and discussed. It was confirmed that the information extracted from multibeam seafloor sensing data, e.g. "water column" recordings, may be useful in seafloor characterisation.
Źródło:: Hydroacoustics; 2009, 12; 127-132
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Test results of bathymetric data processing obtained by swath sounder GS+
Wyniki testów przetwarzania danych batymetrycznych uzyskanych z sondy GS+
Autorzy:: Stateczny, A.
Włodarczyk-Sielicka, M.
Powiązania:: https://bibliotekanauki.pl/articles/222178.pdf
Data publikacji:: 2012
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:: hydrografia
sonar
przetwarzanie danych
hydrography
multibeam sonar
data processing
Opis:: A navigational chart is the primary source of information for the navigator. The main component that contributes significantly to the safety of navigation is the information on the depth of the area. A sonar, which uses acoustic waves is a device for bathymetric measurements and it measures the vertical distance between the head and the bottom or an object located at the bottom. For the purposes of the article, data was used from an interferometric sonar, which is a modification of a multi-beam sonar. Due to the very wide operating angle, it allows for simultaneous vertical data collection, similar to a typical multi-beam sonar, as well as horizontal data collection, much like a sidescan sonar. Bathymetric data is obtained not only on the basis of measurement of time, in which the acoustic wave reflected from the object returns to the receiving transducer, but also by measuring the difference between phases of the wave reaching the piezoelectric elements within a head. The paper presents the test result of bathymetric data processing obtained by the swath sonar GeoSwath+, which is trademark of GeoAcoustics. Data collected during the acquisition was subjected to filtration. For the purpose of the article, the authors used pre-filtered measurement data collected in the area of the Port of Szczecin. However, the filtered samples are large sets of data. Data reduction is a procedure meant to reduce the size of a data set to make it easier and more effective to analyze. This paper examines the capabilities of the GS+ software in the scope of reduced bathymetric data after filtration. The results of different settings are presented in the form of grids, which were then exported to the Surfer 10 software and subjected to detailed analysis.
Mapa nawigacyjna jest głównym źródłem informacji dla nawigatora. Zasadniczym elementem, który wpływa na bezpieczeństwo nawigacji, jest informacja odnosząca się do głębokości morza. Urządzeniem do pomiarów batymetrycznych jest sonar. Mierzy pionową odległość pomiędzy przetwornikiem a dnem lub obiektem umieszczonym na dnie. Dla celów tego artykułu wykorzystano dane z sonaru interferometrycznego, który jest modyfikacją sonaru wielowiązkowego. Dzięki szerokiemu kątowi operacyjnemu pozwala on na symultaniczne zbieranie danych pionowych, podobnie jak typowy wielowiązkowy sonar, oraz danych poziomych, podobnie jak sonar boczny. Dane batymetryczne są uzyskiwane nie tylko na podstawie pomiaru czasu, lecz także poprzez mierzenie różnic fazowych pomiędzy elementami piezoelektrycznymi w przetworniku. Artykuł prezentuje przetwarzanie testowych danych batymetrycznych uzyskanych przez sonar GeoSwath+. Autorzy wykorzystali uprzednio przefiltrowane dane pomiarowe zebrane w rejonie Portu Szczecin. Ponieważ przefiltrowane próbki są dużymi zbiorami danych, poddano je redukcji, czyli procedurze zmniejszenia wielkości zbioru danych, aby łatwiej i efektywniej je analizować. Niniejszy artykuł bada możliwości sondy GS+ w zakresie zredukowanych danych batymetrycznych po filtracji. Wyniki różnych zestawień zostały zaprezentowane w formie siatek, które następnie eksportowano do programu Surfer 10 i poddawano szczegółowej analizie.
Źródło:: Zeszyty Naukowe Akademii Marynarki Wojennej; 2012, R. 53 nr 4 (191), 4 (191); 105-118
0860-889X
Pojawia się w:: Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Multibeam data processing for 3D object shape reconstruction
Autorzy:: Kulawiak, M.
Łubniewski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/332626.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: multibeam sonar
3D reconstruction
point cloud
wrecks
rasterization
Opis:: The technology of hydroacoustic scanning offers an efficient and widely-used source of geospatial information regarding underwater environments, providing measurement data which usually have the structure of irregular groups of points known as point clouds. Since this data model has known disadvantages, a different form of representation based on representing surfaces with simple geometric structures, such as edges and facets, is preferred for data featuring seabed surface relief and various underwater objects. In this paper, the authors propose a multiple-step approach to three-dimensional surface reconstruction from multibeam sonar measurements, relying on the proper application of various algorithms for noise reduction, data rasterization and classification. The results obtained by combining several different surface reconstruction algorithms with the proposed data processing technique were tested, and the strengths and weaknesses of each method were highlighted.
Źródło:: Hydroacoustics; 2017, 20; 105-112
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: 3D object shape reconstruction from underwater multibeam data and over ground LiDAR scanning
Autorzy:: Kulawiak, M.
Łubniewski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/260564.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: multibeam sonar
laser scanning
three dimensional reconstruction
point cloud
triangulation
Opis:: The technologies of sonar and laser scanning are an efficient and widely used source of spatial information with regards to underwater and over ground environment respectively. The measurement data are usually available in the form of groups of separate points located irregularly in three-dimensional space, known as point clouds. This data model has known disadvantages, therefore in many applications a different form of representation, i.e. 3D surfaces composed of edges and facets, is preferred with respect to the terrain or seabed surface relief as well as various objects shape. In the paper, the authors propose a new approach to 3D shape reconstruction from both multibeam and LiDAR measurements. It is based on a multiple-step and to some extent adaptive process, in which the chosen set and sequence of particular stages may depend on a current type and characteristic features of the processed data. The processing scheme includes: 1) pre-processing which may include noise reduction, rasterization and pre-classification, 2) detection and separation of objects for dedicated processing (e.g. steep walls, masts), and 3) surface reconstruction in 3D by point cloud triangulation and with the aid of several dedicated procedures. The benefits of using the proposed methods, including algorithms for detecting various features and improving the regularity of the data structure, are presented and discussed. Several different shape reconstruction algorithms were tested in combination with the proposed data processing methods and the strengths and weaknesses of each algorithm were highlighted.
Źródło:: Polish Maritime Research; 2018, 2; 47-56
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Methods for quality improvement of multibeam and LiDAR point cloud data in the context of 3D surface reconstruction
Autorzy:: Kulawiak, M.
Łubniewski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/332451.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: multibeam sonar
LiDAR
3D
point cloud
shape reconstruction
noise reduction
Opis:: Point cloud dataset is the transitional data model used in several marine and land remote-sensing applications. During further steps of processing, the transformation of point cloud spatial data to more complex models containing higher order geometric structures like edges and facets may be possible, if an appropriate quality level of input data is provided. Point cloud datasets usually contain a considerable amount of undesirable irregularities, such as strong variability of local point density, missing data, overlapping points and noise caused by scattering characteristics of the environment. For these reasons, processing such data can be quite problematic, especially in the field of object detection and threedimensional surface reconstruction. This paper is focused on applying the proposed methods for reducing the mentioned irregularities from several datasets containing 3D point clouds acquired by multibeam sonars and LiDAR scanners. The article also presents the results obtained by each method, and discusses their advantages.
Źródło:: Hydroacoustics; 2016, 19; 251-258
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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