Wyniki wyszukiwania - BazTech

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M-estimation as a tool supporting a vessel traffic controller in the VTS system

Świerczyński S., Czaplewski K.

Polish Maritime Research

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2015

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nr 3

3--13

EN

In order to improve maritime safety and the efficiency of vessel traffic, systems supervising vessel traffic, i.e. VTS (Vessel Traffic Service), started to be created. These systems are aimed to control vessel traffic in waters where traffic congestion, a large concentration of vessels or the presence of navigational hazards creates a risk of collision or stranding. VTS systems constitute maritime safety centres and they must be equipped with appropriate devices in order to be fully functional. Among devices that provide information about vessels are coastal radar stations which are located around a monitored sea area. This kind of spatial arrangement of these stations can be used to simultaneously obtain information about every vessel, but such observations may be fraught with serious errors. Therefore, the estimation methods that are employed and developed in geodesy can be used to improve the accuracy with which a vessel’s position is determined. The Interactive Navigational Structure, i.e. IANS, is an example of how these methods can be applied in navigation; this term has already been introduced into the literature (Czaplewski, 2004). The text below presents the theoretical assumptions underlying the use of IANS as a tool supporting a vessel traffic controller using the VTS system in his/her work. This presentation is supported by a numerical test that was performed in the waters of the Bay of Gdańsk which are covered by the VTS system.

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Determination of the precise observed ship’s position using the traffic control systems and applying the geodesic estimation methods

Świerczyński S., Czaplewski K.

Zeszyty Naukowe / Akademia Morska w Szczecinie

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2012

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nr 32 (104) z. 2

167-172

EN

In the sea areas with heavy traffic, there is a great danger of collision or grounding. In order to improve maritime safety at the gulf of Gdańsk in the middle of 90s, a vessel traffic services was installed. The VTS system operators can provide navigational assistance, if the parameters of the ships movement endanger the safety of navigation. For proper functioning of the system there is a network of coastal radars stations whose signal 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.

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Techniczna charakterystyka systemu automatycznej identyfikacji statków AIS

Czajkowski J.

Elektronika : konstrukcje, technologie, zastosowania

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2010

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Vol. 51, nr 5

13-16

PL

W artykule przedstawiono założenia i techniczną charakterystykę uniwersalnego pokładowego automatycznego systemu identyfikacji statków AIS, który wykorzystuje techniki wielokrotnego dostępu czasowego i jest przeznaczony do pracy w morskim pasmie częstotliwości zakresu VHP. System ten zapewnia efektywną wymianę informacji odnośnie danych nawigacyjnych między statkami i stacjami nadbrzeżnymi co ma istotny wpływ na podniesienie bezpieczeństwa żeglugi.

EN

The article presents system assumptions and technical characteristics for an automatic identification system - AIS using time division multiple access in the VHF maritime mobile band. The use of a universal shipborne AIS allow efficient exchange of navigational data between ships and between ships and shore station, thereby improving safety of navigation.

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Reliability structure of the vessel traffic services in the Gulf of Gdansk

Budny T.

Archives of Transport System Telematics

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2009

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Vol. 2, iss. 3

3-7

EN

In the paper reliability structure of the Vessel Traffic Services Gulf of Gdansk system is described. Four different functional subsystems are distinguished. Some definitions of the different kinds of structures are also presented.