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  1. Article ; Online: The Concept of Using the Decision-Robustness Function in Integrated Navigation Systems.

    Czaplewski, Krzysztof / Czaplewski, Bartosz

    Sensors (Basel, Switzerland)

    2022  Volume 22, Issue 16

    Abstract: The diversity and non-uniformity of the positioning systems available in maritime navigation systems often impede the watchkeeping officer in the selection of the appropriate positioning system, in particular, in restricted basins. Thus, it is necessary ... ...

    Abstract The diversity and non-uniformity of the positioning systems available in maritime navigation systems often impede the watchkeeping officer in the selection of the appropriate positioning system, in particular, in restricted basins. Thus, it is necessary to introduce a mathematical apparatus to suggest, in an automated manner, which of the available systems should be used at the given moment of a sea trip. Proper selection of the positioning system is particularly important in integrated navigation systems, in which the excess of navigation information may impede the final determinations. In this article, the authors propose the use of the decision-robustness function to assist in the process of selecting the appropriate positioning system and reduce the impact of navigation observations encumbered with large errors in self-positioning accuracy. The authors present a mathematical apparatus describing the decision function (a priori object), with the determination of decision-assistance criteria, and the robustness function (a posteriori object), with different types of attenuation function. In addition, the authors present a computer application integrating both objects in the decision-robustness function. The study was concluded by a test showing the practical application of the decision-robustness function proposed in the title.
    Language English
    Publishing date 2022-08-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s22166157
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: A Method of Increasing the Accuracy of Radar Distance Measurement in VTS Systems for Vessels with Very Large Dimensions

    Czaplewski, Krzysztof / Świerczyński, Sławomir

    Remote Sensing. 2021 Aug. 04, v. 13, no. 16

    2021  

    Abstract: The navigation information about a vessel’s position in the waters covered by the vessel traffic system operation is obtained through supervisory services, mainly from coastal navigation radars. Although today it is possible to simultaneously acquire ... ...

    Abstract The navigation information about a vessel’s position in the waters covered by the vessel traffic system operation is obtained through supervisory services, mainly from coastal navigation radars. Although today it is possible to simultaneously acquire data from many independent radars, the obtained radar image is inconsistent and consists of several echoes next to each other. This makes it difficult to establish which echo represents the monitored unit. Another problem is the method of determining radar distances, which significantly affect the quality of determining the observation position. Errors in radar distance may occur when determining the radar echoes from large vessels, where the position of the unit is not the same as the edge of the radar echo to which the observation is made. In this article, the authors present a method of improving the measured radar distance. The presented proposal was verified in navigation and maneuvering simulation conditions. It could support the process of determining the ship position in vessel traffic service (VTS) systems with increased accuracy.
    Keywords data collection ; image analysis ; monitoring ; radar ; remote sensing ; shipping ; ships ; traffic ; water
    Language English
    Dates of publication 2021-0804
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2513863-7
    ISSN 2072-4292
    ISSN 2072-4292
    DOI 10.3390/rs13163066
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Increasing the Reliability of Simulation Tests in Navigation and Maneuvering Simulators Using the k-Epsilon Model Based on the RANS Method.

    Czaplewski, Krzysztof / Swierczynski, Slawomir / Zwolan, Piotr

    Sensors (Basel, Switzerland)

    2021  Volume 21, Issue 15

    Abstract: The influence of wind on the maneuverability of sea-going vessels is a known factor limiting their maneuverability, especially in the case of very large vessels. Adverse weather conditions often limit the maneuverability of vessels or even make it ... ...

    Abstract The influence of wind on the maneuverability of sea-going vessels is a known factor limiting their maneuverability, especially in the case of very large vessels. Adverse weather conditions often limit the maneuverability of vessels or even make it impossible to enter the port. This results in longer delivery times for transported goods as well as measurable material losses for both carriers and their owners. This situation is often caused by a lack of information on differences in the prevailing weather conditions at the entrance to the port and at the seaport itself. There are simulation tools, such as the methods of computational fluid dynamics (CFD), which, after their appropriate adaptation and use in a virtual environment, have become important decision-making tools supporting the port administration when deciding about the movement of vessels. In this article, the authors present the results of research aimed at adapting one of the CFD methods for the needs of maritime navigation. The effects of the work were verified in a virtual environment and were successfully implemented in the port waters of Gdansk, Poland.
    MeSH term(s) Computer Simulation ; Humans ; Hydrodynamics ; Poland ; Reproducibility of Results ; Wind
    Language English
    Publishing date 2021-07-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s21154995
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Methodology of Creation the Simulation Basin based on the Projected Canal through the Vistula Spit

    Zwolan Piotr / Czaplewski Krzysztof

    Annual of Navigation, Vol 22, Iss 1, Pp 5-

    2015  Volume 20

    Abstract: The biggest problem in the process of implementation of the new sea areas project or aids to navigation systems is to check the assumptions without compromising security on real waters. Today, digital models are available for easy and inexpensive ... ...

    Abstract The biggest problem in the process of implementation of the new sea areas project or aids to navigation systems is to check the assumptions without compromising security on real waters. Today, digital models are available for easy and inexpensive replacement of the research methods used so far. For this purpose the navigational and maneuvering simulators are perfect.
    Keywords maritime simulation ; simulators ; design the simulated basin ; Naval Science ; V
    Language English
    Publishing date 2015-12-01T00:00:00Z
    Publisher Sciendo
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Verification of GNSS Measurements of the Railway Track Using Standard Techniques for Determining Coordinates

    Specht, Cezary / Wilk, Andrzej / Koc, Wladyslaw / Karwowski, Krzysztof / Dąbrowski, Paweł / Specht, Mariusz / Grulkowski, Sławomir / Chrostowski, Piotr / Szmagliński, Jacek / Czaplewski, Krzysztof / Skibicki, Jacek / Judek, Slawomir / Licow, Roksana

    Remote Sensing. 2020 Sept. 04, v. 12, no. 18

    2020  

    Abstract: The problem of the reproduction of the railway geometric layout in the global spatial system is currently solved in the form of measurements that use geodetic railway networks and also, in recent years, efficient methods of mobile positioning (mainly ... ...

    Abstract The problem of the reproduction of the railway geometric layout in the global spatial system is currently solved in the form of measurements that use geodetic railway networks and also, in recent years, efficient methods of mobile positioning (mainly satellite and inert). The team of authors from the Gdańsk University of Technology and the Maritime University in Gdynia as part of the research project InnoSatTrack is looking for effective and efficient methods for the inventory of railway lines. The research is part of a wider investigation BRIK (Research and Development in Railway Infrastructure, in polish: Badania i Rozwój w Infrastrukturze Kolejowej). This paper presents a comparative analysis of the problem of the reproduction of the trajectory of the measuring system using tacheometry, satellite measurements made using a measurement trolley, and mobile satellite measurements. Algorithms enabling the assessment of the compliance of satellite measurements with classic tacheometric measurements were presented. To this end, the authors held measurement sessions using modern geodetic instruments and satellite navigation on a section of the railway line. The results of the measurements indicate the convergence of the level of accuracy achieved by different measuring techniques.
    Keywords accuracy ; algorithms ; compliance ; geodesy ; geometry ; inventories ; measurement ; paper ; railroads ; remote sensing ; reproduction ; research and development ; research projects ; satellites ; trajectories
    Language English
    Dates of publication 2020-0904
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    Note NAL-light
    ZDB-ID 2513863-7
    ISSN 2072-4292
    ISSN 2072-4292
    DOI 10.3390/rs12182874
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: Application of Least Squares with Conditional Equations Method for Railway Track Inventory Using GNSS Observations.

    Czaplewski, Krzysztof / Wisniewski, Zbigniew / Specht, Cezary / Wilk, Andrzej / Koc, Wladyslaw / Karwowski, Krzysztof / Skibicki, Jacek / Dabrowski, Paweł / Czaplewski, Bartosz / Specht, Mariusz / Chrostowski, Piotr / Szmaglinski, Jacek / Judek, Slawomir / Grulkowski, Slawomir / Licow, Roksana

    Sensors (Basel, Switzerland)

    2020  Volume 20, Issue 17

    Abstract: Satellite geodetic networks are commonly used in surveying tasks, but they can also be used in mobile surveys. Mobile satellite surveys can be used for trackage inventory, diagnostics and design. The combination of modern technological solutions with the ...

    Abstract Satellite geodetic networks are commonly used in surveying tasks, but they can also be used in mobile surveys. Mobile satellite surveys can be used for trackage inventory, diagnostics and design. The combination of modern technological solutions with the adaptation of research methods known in other fields of science offers an opportunity to acquire highly accurate solutions for railway track inventory. This article presents the effects of work carried out using a mobile surveying platform on which Global Navigation Satellite System (GNSS) receivers were mounted. The satellite observations (surveys) obtained were aligned using one of the methods known from classical land surveying. The records obtained during the surveying campaign on a 246th km railway track section were subjected to alignment. This article provides a description of the surveying campaign necessary to obtain measurement data and a theoretical description of the method employed to align observation results as well as their visualisation.
    Language English
    Publishing date 2020-09-01
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s20174948
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Digital Filtering of Railway Track Coordinates in Mobile Multi-Receiver GNSS Measurements.

    Wilk, Andrzej / Koc, Wladyslaw / Specht, Cezary / Judek, Slawomir / Karwowski, Krzysztof / Chrostowski, Piotr / Czaplewski, Krzysztof / Dabrowski, Pawel S / Grulkowski, Sławomir / Licow, Roksana / Skibicki, Jacek / Specht, Mariusz / Szmaglinski, Jacek

    Sensors (Basel, Switzerland)

    2020  Volume 20, Issue 18

    Abstract: The article discusses an important issue in connection with the technique of mobile Global Navigation Satellite System (GNSS) measurements of railway track coordinates, which is digital filtering performed to precisely determine railway track axes. For ... ...

    Abstract The article discusses an important issue in connection with the technique of mobile Global Navigation Satellite System (GNSS) measurements of railway track coordinates, which is digital filtering performed to precisely determine railway track axes. For this purpose, a measuring technique is proposed which bases on the use of a measuring platform with a number of appropriately distributed GNSS receivers, where two of them determine the directional base vector of the platform. The receivers used in the research had high measuring frequency in the Real Time Kinematic (RTK) operating mode and enabled correction of the obtained results in post-processing. A key problem discussed in the article is the method for assessing the quality of the measurement results obtained from GNSS receivers, and their preparation for further processing making use of geometrically constrained parameters of the base vector and specialized digital filtering, among other elements, to precisely determining the track axis. The obtained results confirm the applicability of the used method of GNSS signal processing.
    Language English
    Publishing date 2020-09-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s20185018
    Database MEDical Literature Analysis and Retrieval System OnLINE

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