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    Wyświetlanie 1-6 z 6
    Tytuł:
    Development of an autonomous Global Navigation Satellite System ground station and its calibration for monitoring of local ionospheric perturbations
    Autorzy:
    Galas, R.
    Čokrlić, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/135456.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    local ionospheric perturbations
    scintillations
    single autonomous GNSS monitoring station
    continuously monitoring GNSS ground systems
    autonomous power management
    real-time processing
    hardware calibration
    Opis:
    A state-of-the-art monitoring global navigation satellite system (GNSS) system has been originally designed and developed for various positioning and atmosphere-sensing purposes by the authors and updated to fulfil the challenging requirements for monitoring of ionospheric perturbations. The paper discusses various scientific and technically challenging issues, such as the requirement for an autonomous operating ground GNSS station and how this can be fulfilled. Basic algorithms for monitoring of local ionospheric perturbations with GNSS receivers are described. The algorithms require that inter-frequency hardware biases be known. Although the satellite transmitter biases can be obtain from the IGS services, the user takes responsibility for the estimation of frequency dependent receiver hardware biases and for the control of their variations. The instrumental signal delays are important for timing applications and GNSS monitoring of the ionosphere and are also required for recovering of the integer carrier-phase ambiguities. The paper presents an algorithm for calibration of inter-frequency biases of global positioning system (GPS) receivers and validates the first set of results.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 54-59
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Initial analysis of the tracking performance of the GOOSE GNSS Software-Defined Receiver
    Autorzy:
    Galas, Roman
    Kunzi, Florian
    Adolfs, Marjolijn
    Overbeck, Matthias
    Felber, Wolfgang
    Powiązania:
    https://bibliotekanauki.pl/articles/1819198.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    local ionospheric perturbations
    scintillations
    single autonomous GNSS monitoring station
    continuously monitoring GNSS ground systems
    autonomous power management
    real-time processing
    software-defined receiver
    Opis:
    The GOOSE (GNSS Receiver with open software interface) Software-Defined Receiver has been developed at the Fraunhofer Institute for Integrated Circuits (IIS) in Nürnberg, Germany. The main motivation for the development of this platform was to control the receiver at all stages, from digital signal processing to the PVT domain, and to enable controlled feedback to the hardware. Besides having access to all raw data including correlation values, the GOOSE receiver also enables for example tight- or ultra-tight integration with an inertial navigation system or other dead reckoning systems, as these kinds of architectures require access to the acquisition and tracking loops. In this paper, the tracking performance of the GOOSE platform was evaluated and compared to a reference receiver (Septentrio PolaRx5S). Several long data sessions were recorded on a “zero baseline” in which both receivers used the same precise geodetic antenna that was also developed at Fraunhofer IIS. The measurements were performed in a harsh environment (obstructions, multipath, possible interferences), as well as on a site with an unobstructed sky view. Quality and performance analyses were performed using raw measurements (in the domain of primary observables) of three civil GPS signals: L1CA, L2CM, and L5. The data were processed using the “zeroEdit” module of the TUB-NavSolutions academic software for education and research. The quality of the raw observables and tracking performance were described by the following parameters: number of cycle slips detected, number of un-correctable cycle slips, number of loss of locks of the signals, number of single epoch data gaps, and the length of carrier phase arcs. The presentation is illustrated with some numerical examples.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 63 (135); 113-120
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expert systems based on Dempster–Shafer theory of evidence in maritime – characteristic and applications
    Autorzy:
    Neumann, T.
    Weintrit, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/360620.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    expert systems
    Ships Monitoring System
    Observatory Station
    Location Science
    marine traffic engineering
    Opis:
    The paper presents the usage of mathematical theory of evidence in maritime and offshore applications. This paper brings together a collection of some research on the Dempster–Shafer theory of belief functions. By bridging fuzzy logic and probabilistic reasoning, the theory of belief functions has become a primary tool for knowledge representation and uncertainty reasoning in expert systems. This paper can serve as the authoritative reference in the field of evidential reasoning and an important archival reference in a wide range of areas including uncertainty reasoning in artificial intelligence and decision making in maritime and offshore applications, in management, engineering and transport, in marine shipping, coastal management, navigation, surveillance, monitoring and observation. In particular the paper describes uncertainty reasoning approaches to decision making in maritime and offshore applications, possible applications in safety-based assessment, Coastal Management Expert System, mathematical theory of evidence in marine navigation, the optimisation problem of monitoring stations distribution and finally the facility location and location science.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 141-147
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of selected remote sensing methods in detecting and tracking marine pollution
    Autorzy:
    Gucma, Michalina
    Deja, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/24202551.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    monitoring of the marine environment
    remote sensing
    satellite systems
    aerial monitoring
    maritime transport
    protection of the marine environment
    environmental management
    Opis:
    This paper discusses the use of satellite tracking during an environmental disaster at sea, and it assesses the possibility of using remote sensing imagery captured by satellites using multispectral cameras and synthetic-aperture radar (SAR). This study is based on scientific literature and satellite tracking of the X-Press Pearl container ship disaster, which involved the EO-Browser platform. The purpose of this paper is to assess selected remote sensing methods for detecting and tracking marine pollution. The first part of the paper discusses satellite tracking of the X-Press Pearl disaster. The second part focuses on evaluation of the quality of remote sensing imagery from satellites and aircraft, when taking weather conditions into consideration. It should be noted that the research was conducted in real time when the incident occurred. News about the accident was also tracked in real time, allowing for a thorough analysis of the incident and, thus, an assessment of the different sensing systems. Although research on such disasters is crucial for the protection of the marine environment, scientific literature on this topic remains limited. This research area is very important for the protection of the marine environment, in the context of looking for solutions to these issues.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 71 (143); 102--108
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of a novel Receiver Autonomous Integrity Monitoring procedure consistent with IMO requirements
    Autorzy:
    Mink, M.
    Heck, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/134914.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Global Navigation Satellite Systems
    integrity
    Receiver Autonomous Integrity Monitoring
    maritime
    International Maritime Organization
    protection level
    Opis:
    Although integrity concepts for Global Navigation Satellite Systems (GNSS) are ubiquitous in the aviation community, integrity algorithms of comparable maturity have not yet been developed for maritime users. The International Maritime Organization (IMO) specifies requirements different from those specified by the International Civil Aviation Organization (ICAO). These different requirements affect the design of the integrity algorithms with respect to integrity risk allocation and threat space. This paper describes a novel integrity algorithm based on conditions valid for maritime users. The performance of the novel integrity algorithm has been assessed and compared to a conventional Receiver Autonomous Integrity Monitoring (RAIM) approach consistent with IMO requirements.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 155-161
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    European Network for Maritime Surveillance. General outline
    Europejska Sieć Obserwacji Morskich. Ogólna koncepcja
    Autorzy:
    Urbański, J.
    Morgaś, W.
    Mięsikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/360336.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Europejska Sieć Obserwacji Morskich (ENMS)
    Globalny Monitoring Środowiska i Bezpieczeństwa (GMES)
    Globalny System Systemów Obserwacji Ziemi (GEOSS)
    European Network for Maritime Surveillance (ENMS)
    Global Monitoring of Environment and Security (GMES)
    Global Earth Observing System of Systems (GEOSS)
    Opis:
    This paper presents the general outline of European Network for Maritime Surveillance (ENMS). Establishing such a network constitutes one of the main tasks of the Integrated Maritime Policy of the European Union, which is now being developed. The relations of that future network with the already existing Vessel Traffic Monitoring and Information System (VTMIS) of the European Union, as well as with the already developing Global Monitoring for Environment and Security (GMES) system and with the Global Earth Observing System of Systems (GEOSS) have also been shown.
    W referacie przedstawiono ogólną koncepcję Europejskiej Sieci Obserwacji Morskich (ENMS). Utworzenie takiego systemu stanowi jedno z podstawowych zadań opracowywanej obecnie Zintegrowanej Polityki Morskiej Unii Europejskiej. Przedstawiono również relacje tworzonego systemu z istniejącym już Systemem Monitoringu Ruchu Statków i Informacji (VTMIS) Unii Europejskiej oraz z powstającym europejskim systemem Globalnego Monitoringu Środowiska i Bezpieczeństwa (GMES) oraz z Globalnym Systemem Systemów Obserwacji Ziemi (GEOSS).
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2008, 13 (85); 86-91
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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