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Hydroacoustics
2007 Vol. 10 131-142
EN The paper summarizes several aspects of solving statistical linear inverse problems that occur in the processes related to fish abundance estimation performed on the basis of acoustically acquired data. As the difficulty in solving such problems inherently comes from uncertainty in determination of [...]
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Nukleonika
EN Selected methods for border monitoring, utilizing nuclear techniques are discussed, with a particular emphasis on those developed with the contribution of our Institute. It covers a basic inspection of the borders against smuggling of radioactive materials, as well as known systems using linear acce[...]
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Hydroacoustics
2001 Vol. 4 173--176
EN Application of the modem VLSI digital technology to the area of portable sonar equipment, like depth sounders, fish finders, short-range sonars etc., provide automatic acquisition and recording of acoustic data, along with communication with various marine equipment, like chart plotter, GPS, or even[...]
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Hydroacoustics
2001 Vol. 4 177--180
EN The typical approach to the problem of indirect fish target strength estimation from data collected using single-beam system is based on inversion of probability density function (PDF) of measured fish echo level. Due to ill-conditioning of most inversion algorithms, small errors in input data, and [...]
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Hydroacoustics
2003 Vol. 6 49--52
EN In fisheries acoustics the bias introduced by a system threshold in the integration of echoes from fish and other marine organisms has long been recognized. Some simple methods for evaluating such a bias uses Rayleigh assumption applied to fish backscattering length distribution. More adequate metho[...]
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Hydroacoustics
2000 Vol. 3 149--154
EN When fish target strength is estimated indirectly from single beam echo peak values the inverse techniques of solving the "single-beam integral equation" are recently quite satisfactorily used. This approach needs prior knowledge of beam pattern PDF, as it represents the kernel of the integral equat[...]
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Hydroacoustics
2006 Vol. 9 133-138
EN The paper presents an algorithm for estimation the fish length distribution from acoustic target strength data. The theory of scattering from a tilted cylinder is used for modelling the fish directivity pattern of swimbladdered fish. The model allows for formulating the dependence of target strength[...]
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Hydroacoustics
2012 Vol. 15 27-32
EN The paper presents results of time-frequency analysis of audio acoustic signals using the method of Concentrated Spectrograph also known as "Cross-spectral method" or "Reassignment method". Presented algorithm involves signal's local group delay and channelized instantaneous frequency to relevantly [...]
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Roczniki Geomatyki
EN The Department of Geoinformatics Systems of the Faculty of Electronics, Telecommunication, and Informatics at the Gdansk University of Technology (GUT) is involved in geoinformatics research with emphasis on web based GIS, satellite navigation, ECDIS, digital mapping and other systems for maritime a[...]
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Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne
2010 T. 19 139-144
PL W niniejszym artykule dokonano krótkiego przeglądu najpopularniejszych systemów operacyjnych dedykowanych dla szeroko pojętych urządzeń mobilnych. Następnie przedstawiono jednoukładowy zestaw uruchomieniowy DevKit8000 z procesorem OMAP3530 oraz z zainstalowaną dystrybucją systemu operacyjnego Linux [...]
EN This article provides a brief overview of the most popular of existing operating systems dedicated for mobile electronic devices usage. The compact board, DevKit8000, using OMAP3530 microprocessor is investigated. The board is loaded with the GNU/Linux operating system - Angstrom. The abovementioned[...]
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Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne
2010 T. 19 133-137
PL W artykule przedstawiono propozycję definicji języka opisowego przeznaczonego do tworzenia rozszerzeń dla profesjonalnych systemów GIS. Język ten umożliwiałby szersze wykorzystanie takich systemów i wzbogacanie ich funkcjonalności poprzez ułatwienie dostępu do wszystkich składowych systemu, w taki s[...]
EN The article presents an attempt of defining the descriptive language which could be a proposal of the standard for writing extensions of professional GIS systems. The language could enable the wider usage of the system of that type enriching their functionality. The main objective of that language i[...]
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Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne
2008 T. 15 207-212
PL Jednym z najczęściej używanych urządzeń służących do szeroko rozumianego telemonitoringu morskiego są sonary wielowiązkowe (ang. Multibeam systems - MBS). Ich wysoka wydajność w tworzeniu informacji o obiektach znajdujących się pod wodą skutkuje w dużych ilościach danych pozyskiwanych podczas rejsów[...]
EN High efficiency of multibeam sonar system (MBS) hardware due to operational requirements (i.e. high frequency, high ping rate and high resolution of collected data) results in very large volumes of datasets stored on local hard drives of operator's station. In this context, the process of archiving [...]
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Hydroacoustics
2001 Vol. 4 153--156
EN The simple, real-time procedure for seafloor relief reconstruction and simultaneous seabed type identification using echo data from hypothetical multibeam sonar system was proposed. The algorithm was tested using artificially generated relief and seabed type data. In the first stage, 3D surface of s[...]
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Hydroacoustics
2005 Vol. 8 9-14
EN The modern underwater acoustic equipment, like multibeam sonar, is able to provide the data which allows for unambiguous localization and also 3D visualisation of targets of different kinds, including wrecks, mines and other submerged objects. The large amount of information that seems to be useful [...]
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Hydroacoustics
2003 Vol. 6 189--194
EN For the last decade multibeam sonars have been increasingly used for mapping and visualization of the bottom surfaces to provide the 'physical bases' for environmental studies due to theirs unprecedentedly high resolution mapping ability. However, the raw sonar records are subject to systematic erro[...]
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Hydroacoustics
2003 Vol. 6 215--220
EN The article describes an analysis of the effects of mutual impedance on the phase of multi-element antenna signals. The calculations were made using a substitute model of a Mason ultrasonic transducer. The effects of self and mutual impedance on the phase of multielement antenna signals were conside[...]
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Hydroacoustics
1997 Vol. 1 31--26
EN The knowledge of beam pattem probability density function (PDF) plays a crucial role in target strength estimation when using indirect methods. The paper describes the theoretical and practical aspects of approximations applied in calculating the PDF of this deterministic function from a probabilist[...]
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Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne
2003 nr 1 1--7
PL Język wizualizacji wirtualnej rzeczywistości VRML (ang. Virtual Reality Modeling Language) obok typowych aplikacji w grafice komputerowej znalazł również zastosowanie w wiciu dyscyplinach naukowych. Przykładowo, w chemii stosuje się go do zobrazowania modeli atomowych cząsteczek, w medycynie do wizu[...]
EN Virtual Reality Modeling Language VRML despite the typical application in computer graphics is also used in various fields. For instance in chemistry it is used for visualization of atom particles, in medicine for modeling of human organs, in astronomy for visualization of trajectories of the stars [...]
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Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne
2003 nr 1 59--67
PL Artykuł przedstawia projekt i realizację miniaturowej echosondy rybackiej służącej do automatycznego rejestrowania głębokości dna morskiego. Echosonda może pracować jako urządzenie autonomiczne zasilane z akumulatora, a ponadto, dzięki zgodności z protokołem NMEA 0183, umożliwia komunikację z innymi[...]
EN A novel miniaturized autonomous digital depth sounder was developed for automatic storing and recording of sea bottom depth, along with communication to various marine equipment, like chart plotter, GPS and radar, using NMEA 0183 protocol. The analog part of the sounder consists of the miniature HEX[...]
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Hydroacoustics
2006 Vol. 9 17-22
EN Nowadays, the techniques for 3D computer graphics are developing dynamically. They are finding application not only for creating computer games, but often for three-dimensional data visualization systems. Applying these techniques make graphical operations more effective and consequently these syste[...]
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