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Browsing by Author Czaplewski, Krzysztof: 61 Scientific Journals of the Maritime University of Szczecin

  • Czaplewski, Krzysztof; Specht, Cezary; Koc, Władysław; Wilk, Andrzej; Karwowski, Krzysztof; Dąbrowski, Paweł; Specht, Mariusz; Chrostowski, Piotr; Szmagliński, Jacek (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    For many years, satellite systems have seen widespread use in a variety of technical applications, as well as in operations related to setting-out and the exploitation of track infrastructure. Their main applications include an inventory of the trackage course and detecting changes in its position. In both of these tasks, the most important element that determines the quality of an analyses is the high accuracy of the determinations being carried out. Satellite surveying techniques are not always sufficiently accurate, and in such cases, it is necessary to employ other land surveying methods to process surveying data. This article presents the authors’ considerations with regards to the possibility of applying one of the most common land surveying adjustment methods, the parametric method, to operations related to an inventory of tram infrastructure in Gdańsk. The results are based on surveys carried out during a surveying campaign in the autumn of 2018. The considerations presented in the article concern a small part of the research conducted under project No. POIR.04.01.01-00-0017/17 entitled “Development of an innovative method for determining the precise trajectory of a railborne vehicle” which is being implemented by a consortium of Gdansk University of Technology and Gdynia Maritime University.

Other publications

  • Zwolan, Piotr; Czaplewski, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2012)
    The modern simulation software includes an impact of forces acting on the ship hull. One of the mostsignificant forces is sea waves acting. The mathematical model allows simulation of ship motions in irregularsea wave area, both – at deep and shallow waters. The wave surface model enables simulation of the waveelevation in compliance with wave spectrum occurring in various conditions. The paper presents generaldescription of the sea wave model used in maritime simulators. An example of such simulators is used at the laboratory of the Naval University of Gdynia, where it is operated basing on NT-Pro 5000 software by Transas Marine. The latest version of simulation software gives a possibility to select the wave spectrum. Selection of the waving type, depending on sea area location, makes the ship movement more reliable. This is an important element in testing the ships behavior process
  • Czaplewski, Krzysztof; Świerczyński, Sławomir (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2012)
    In the sea areas with heavy traffic, there is a great danger of collision or grounding. In order to improvemaritime safety at the gulf of Gdańsk in the middle of 90s, a vessel traffic services was installed. The VTSsystem operators can provide navigational assistance, if the parameters of the ships movement endanger thesafety of navigation. For proper functioning of the system there is a network of coastal radars stations whosesignal is used to create a radar picture of the navigational situation. In the vts determination of the ship position based on radar observations may lead to large errors. The IMO organization recommends to reject and repeat measurements containing large errors. For a moving ship perform a re-measurement in the same position is not possible. This paper presents possibility of compensation the coordinates of the vessel position based on radar observations using the of M-estimation methods
  • Czaplewski, Krzysztof; Wąż, Mariusz (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2008)
    Conception of the radar navigation process automation is presented in this paper. In navigation, using the radar presentation is very common. Designing and working out still new navigation systems based mainly on modern radars is the result of the search for precise, automatic and independent systems which allow us to lead and manoeuvre in the vicinity of constant and moving navigational dangers. The article presents the initial researches results obtained on that field and focuses on the following problems: – extraction of the radar image characteristic points, – determination of the position of characteristic points and of the own position with the use of the methods of comparing navigation, – automation of the radar image characteristic points identification, – improvement of the accuracy while determining one’s own position and the position of the characteristic points based on the elements of the compensation calculation
  • Czaplewski, Krzysztof; Morgaś, Wacław; Kopacz, Zdzisław (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2010)
    In this paper, an attempt has been made to present National Maritime Safety and Security Systems. Such systems have been established as a result of close cooperation of national maritime services and ships themselves. Such systems operate in national maritime areas of particular states, regardless of EU membership. The history of the development of above mentioned systems is much longer than the history of the International Maritime Safety and Security System. However, the organizational and functional structure of these systems has been scarcely presented in the shipping literature . Therefore, the main objective of this paper is to bring these issues closer to the public attention
  • Czaplewski, Krzysztof; Czaplewski, Bartosz (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2012)
    In order to maintain a high level of security in areas where vessel traffic services operate, there is a great use of industrial cameras, which transmit information to the VTS controllers. Two very important elements of the video image transmission are speed and confidentiality of the transmitted data. Currently, one of the major problems in front of such systems is to choose an appropriate method for safe image transmission that meets the requirements of speed and confidentiality. There is the possibility of using the tools of computer science known as fingerprints. There are two ways to protect multimedia copyright. First way is to encrypt the data. Encryption provides that only privileged receivers with correct decryption keys will be able to decrypt information. Unfortunately, encryption isn’t sufficient protection, because after decryption, privileged user may easily violate copyright by sharing decrypted data with public. Second way is called a digital fingerprinting, which rely on embedding of some additional binary sequence into image. This sequence, called a fingerprint, is unique for each receiver and it’s unnoticeable for the human eye. With fingerprinting there is a possibility of further analysis of a intercepted copy which is suspected of being illegally shared. The paper presents the theoretical basis for the use of fingerprinting methods to protect the media sent in VTS systems, as well as a description of the most promising methods, in terms of safety and cost, called Joint Fingerprinting and Decryption methods. Approach proposed by the authors can enhance the security of the video image transmission in VTS systems
  • Czaplewski, Krzysztof; Kopacz, Zdzisław; Morgaś, Wacław (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    From time immemorial, the main type of human activity at sea was transport of goods, then fishery, exploration of overseas territories, combating enemy’s vessels etc. The twentieth century visualized clearly also a military activity, whereas the latter part of the century also an industrial one on the continental shelves. Progress in these fields was the leading motive power considerably increasing human activity at sea beyond transport. The paper shows results of research work on designing of human activity at sea in the navigational simulators environment. These research works have been conducted in Institute of Navigation and Hydrography Polish Naval Academy.
  • Zwolan, Piotr; Czaplewski, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The paper describes a mean of using vessel’s manoeuvring parameters recorded in real conditions for the purpose of analysing the environment influence on ship’s behaviour. This information has also been used to conduct a comparative analysis of a real vessel and its simulation model in the data base of a navigationmanoeuvring simulator. The measurements were taken on an unrestricted sea area so as to eliminate the impact of developed sites on wind field. The research was conducted in the region of the North Sea and Baltic Sea.
  • Świerczyński, Sławomir; Świerczyński, Sławomir; Czaplewski, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The paper presents an analysis of the selected robust adjustment methods applied in geodesy, proving thereby justifiability in choosing the applied attenuation function. With a use of the radar navigation methods, the said methods were applied in the process of determination of the observed vessel’s positions
  • Świerczyński, Sławomir; Czaplewski, Krzysztof (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The paper presents joint operation of AIS-AtoN and radar. There was brought forward a fact of divergence of the information visualized in radar in cases when AIS receivers are produced by different manufacturers. It happens that the AtoN AIS information is not displayed by radar screen. It is also essential that not every ship is provided with AIS equipment
  • Czaplewski, Krzysztof; Świerczyński, Sławomir; Zwolan, Piotr (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This paper presents the authors’ reflections on using integral calculus when preparing the process of locating single ground-based chains of positioning systems in marine navigation. These reflections are purely theoretical and presented research results apply to a hypothetical navigation system that operates based on the ratio of distances, which is regarded as a navigation parameter.
  • Apology 
    Czaplewski, Krzysztof; Świerczyński, Sławomir; Zwolan, Piotr (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The article by Krzysztof Czaplewski, Sławomir Świerczyński and Piotr Zwolan entitled “Using elements of integral calculus in the process of optimizing the configuration of navigation positioning systems”3 published in the previous issue (45/2016) is an English version of the revised article by Krzysztof Czaplewski “Kryterium całkowe jako narzędzie matematyczne wspomagające proces optymalizacji wystawienia stacji systemu nawigacyjnego” 4, published in ZN AMW No. 3/2000. The authors would like to apologize for having forgotten to include this article in the reference section, which mistake was noticed after the article had been published. The authors' intention was not to conceal the previous publication, but to return to the previous studies on navigation processes optimization devised by one of the authors. The authors considered it desirable to get back to the previous results, as the problems of automatization of optimization processes are still valid in navigation and require further work. Furthermore, the subject of the article lies in the area of studies currently performed by the authors. In the context of increasingly frequent information on spoofing and jamming of satellite system signals, ground-based radio navigation systems begin to grow in significance again. For example, the contemporary mutation of the Loran system called eLoran seems to be at the time the best option supporting the operation of GNSS. The erection of new eLoran stations or other systems supporting the operation of GNSS has to be preceded by reliable optimization studies among others, and this is the reason why the authors are interested in this area of studies. We would like to apologize to anyone who felt offended by the situation. The Authors
  • Czaplewski, Krzysztof; Wiśniewski, Zbigniew (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Przedstawiono ideę tworzenia interaktywnych struktur nawigacyjnych przez nawigatora w trakcie podróży morskiej W procesie obliczeń zastosowano zasady wyrówna-n,a sekwencyjnego oraz estymację odporną na błędy grube. Założenia teoretyczne weryfikowano na symulowanym przykładzie nawigacyjnym.
  • Dąbrowski, Paweł S.; Specht, Cezary; Koc, Władysław; Wilk, Andrzej; Czaplewski, Krzysztof; Karwowski, Krzysztof; Specht, Mariusz; Chrostowski, Piotr; Szmagliński, Jacek; Grulkowski, Sławomir (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Determining the course of a railway track axis using satellite methods relies on ensuring the precise assembly of GNSS receivers in dedicated measuring devices. Depending on the number of receivers, solutions that are based on placing the apparatus directly above the railway track axis (as well as in eccentric positions) are used to indirectly obtain data to form the basis of the desired results. This publication describes the installation of five GNSS receivers on a mobile measuring platform as part of the InnoSatTrack project. The methodology and the procedure of the geodetic measurements required to obtain the geometrical configuration of the measuring apparatus, specified in the technical project, are presented. The publication presents the principles of total station measurement methods as well as the steps taken to achieve precise results from staking out. The process of acquiring the same configuration of the GNSS receivers, based on the geometry of the squares on the two measuring platforms that were used in the research, has been shown. The final determination of the position of the receivers did not exceed an error of 0.010 m with an average error of 0.003 m, despite the occurrence of mounting difficulties. The results have demonstrated the high credibility and effectiveness of the presented solution.
  • Specht, Mariusz; Szmagliński, Jacek; Specht, Cezary; Koc, Władysław; Wilk, Andrzej; Czaplewski, Krzysztof; Karwowski, Krzysztof; Dąbrowski, Paweł S.; Chrostowski, Piotr; Grulkowski, Sławomir (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Each year, global navigation satellite systems (GNSS) improve their accuracy, availability, continuity, integrity, and reliability. Due to these continual improvements, the systems are increasingly used in various modes of transport, including rail transport, the subject of this publication. GNSS are used for rail passenger information, rail traffic management, and rail traffic control. These applications differ in the positioning requirements that satellite navigation systems must meet. This article presents the methods and systems of rolling stock location and tracking using the Polish State Railways (PKP) as an example. The information on the equipment used for train positioning is not specified anywhere, hence they may differ, even for the same multiple units travelling in different parts of the country. In addition, the publication presents the progress of the European Train Control System (ETCS) implementation by the PKP.

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