Wyniki wyszukiwania - Biblioteka Nauki

1

Przygotowania do Światowej Konferencji Radiokomunikacyjnej (WRC-15) w zakresie radiokomunikacji morskiej

100%

Czajkowski J. , Korcz K.

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tom nr 10

1357--1361

PL

Scharakteryzowano proces przygotowań do Światowej Konferencji Radiokomunikacyjnej WRC-15 na poziomie światowym oraz europejskim. Przedstawiono punkty porządku obrad WRC-15 dotyczące radiokomunikacji morskiej i stanowisko Międzynarodowej Organizacji Morskiej IMO w odniesieniu do tych punktów, które dotyczyły wykorzystania widma radiowego do zapewnienia bezpieczeństwa nawigacji oraz radiokomunikacji morskiej.

EN

The preparation process for WRC Conference on both the global and the European level have been described. The position of the International Maritime Organization on the WRC-15 agenda items concerning the safety of navigation and maritime radiocommunication have been presented as well.

2

The Propagation Characteristic of DGPS Correction Data Signal at Inland Sea - Propagation Characteristic on LF/MF Band Radio Wave

84%

Okuda S. , Toba M. , Arai Y.

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tom Vol. 7, no. 4

549--554

EN

User at the Inland Sea requires high position accuracy which is 5 m (2drms) or less. Therefore the position accuracy of standalone GPS is insufficiency. Consequently it needs to use DGPS for navigator sailing the Inland Sea. We executed numerical simulation of the propagation characteristic on the extended line of bridge pier at opposite side from DGPS station, and already confirmed that bit error in DGPS correction data signal occurs, and that correction data could not form by bit error. Furthermore, we carried out numerical simulation of the propagation characteristic of DGPS correction data signal received at sailing through center of the bridge, and solved receiving condition of DGPS correction data signal before and after passing through the bridge. In this paper, we executed to inspect mutually results of electric field intensity simulation for oversea and overland propagation on some sea area of the Inland Sea and measuring results of electric field intensity for DGPS correction data signal, and evaluated the possibility of abnormal propagation comprehensively.

3

Implementation of Multiple Access Techniques Applicable for Maritime Satellite Communications

84%

Ilcev S. D.

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tom Vol. 7, no. 4

529--540

EN

In this paper are introduced fundamentals, characteristics, advantages and disadvantages of Multiple Access (MA) employed as transmission techniques in the Maritime Mobile Satellite Communications (MMSC) between ships and Coast Earth Station (CES) via Geostationary Earth Orbit (GEO) or Not-GEO satellite constellations. In fixed satellite communication, as a rule, especially in MMSC many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users can be solved by using MA technique, such as Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), Space Division Multiple Access (SDMA) and Random (Packet) Division Multiple Access (RDMA). Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with complete charge and to create a different MA to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.

4

Ways to improve radiotelephone procedures training for the navy

84%

Nikolov Z.

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tom Vol. 11, no. 1

181--183

EN

Every type of training can be improved. Trying to find ways to do so is a continuous process. The identification and implementation of the most effective of those can only be adequate to the changing environment in case of objective review, comparison and analysis. This paper discusses some approaches whose adoption can lead to the enhancement of the training for radio operators for working in tactical net-works for the Navy. It also shares some experience from the implementation of such methods when training cadets at the Bulgarian Naval Academy.

5

New learning methods for marine oil spill response training

84%

Halonen J. , Lanki A. , Rantavuo E.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2017

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tom Vol. 11, no. 2

339--345

EN

In Finland the Regional Fire and Rescue Services (RFRS) are responsible for near shore oil spill response and shoreline cleanup operations. In addition, they assist in other types of maritime incidents, such as search and rescue operations and fire-fighting on board. These statutory assignments require the RFRS to have capability to act both on land and at sea. As maritime incidents occur infrequently, little routine has been established. In order to improve their performance in maritime operations, the RFRS are participating in a new oil spill training programme to be launched by South-Eastern Finland University of Applied Sciences. This training programme aims to utilize new educational methods; e-learning and simulator based training. In addition to fully exploiting the existing navigational bridge simulator, radio communication simulator and crisis management simulator, an entirely new simulator is developed. This simulator is designed to model the oil recovery process; recovery method, rate and volume in various conditions with different oil types. New simulator enables creation of a comprehensive training programme covering training tasks from a distress call to the completion of an oil spill response operation. Structure of the training programme, as well as the training objectives, are based on the findings from competence and education surveys conducted in spring 2016. In these results, a need for vessel maneuvering and navigation exercises together with actual response measures training were emphasized. Also additional training for maritime radio communication, GMDSS-emergency protocols and collaboration with maritime authorities were seemed important. This paper describes new approach to the maritime operations training designed for rescue authorities, a way of learning by doing, without mobilising the vessels at sea.