A. Lisaj

Analysis of lossless radar images compression for navigation in marine traffic and remote transmission

One of the most important issue in maritime international transport is the necessity of increasing the level of safe in vesselpsilas navigation. We can achieve this goal using various methods. One of them is the enlargement and enrichment of navigational data processed by own deck computer net and external systems AIS (Automatic Identification System) and VTS (Vessel Traffic Service). The radar image contains extensive and useful navigational information. That is why the incorporation of it into remote transmission is proposed here. In order to successfully realize this process the enhancement of the NMEA (National Marine Electronics Association) code is proposed through incorporation of radar images into particular protocols. To decrease size of data under transmission a new algorithm, namely RLE-BER (Run Length Encoding with Binary Encoded Runs) for radar images compression is proposed. Some experimental results are presented on real data. The detail description of the method is also provided. The initial results are very promising, as the average compression ratio is near to 5:1 when considering monochrome palette (binary image). The proposed method is lossless, because we assumed the maximum safety level of the final system.

New method of the radar images compression for the needs of navigation in marine traffic

The paper presents a new concept of the lossless radar images compression method for the needs of the navigation in marine traffic. A fundamental problem of vessel operation in marine transport is increasing safety level of own shipping and vessels cooperating. We can receive this aim using various ways. One of them is radar images compression method for the needs of the remote transmission. The radar image is one of the major source of navigational data. To decrease size of data under transmission a new algorithm, namely RLE-BER, for radar images compression was firstly proposed by Lisaj et. al. (2007).Now we are presenting in our papers practical results on real navigational data and provide same discussion on future plans in the way of verification binary methods. After experimental research we received value of the compression ratio near 5:1 and this result is very optimistic for the next step in our scientific research.

Radar and AIS Data Fusion for the Needs of the Maritime Navigation

Integration the following components: RADAR and AIS, offer the opportunity to build more sophisticated systems for safety navigation. The integrations idea is set on the exploitation of synergies between both components. The paper presents results of development of method of integration of radar data and AIS information on the base of multisensor Kalman filter.

Integrated communications platform for RIS centres supporting inland navigation

This article looks at the architecture of the Integrated Communications Platform for the RIS Centres supporting inland navigation. It analyses the feasibility of application of satellite‐based telecommunications, localization and navigation systems in inland navigation, and presents methods of integration of radio communications systems which carry out distress communications algorithms and procedures in inland navigation. Feasibility of integration of the AIS‐SART and AIS‐Satellite, guidance and positioning subsystems into the RIS Centre is examined. The technical specifications of the FleetBroadband and Mini‐VSAT systems are examined for usability in the multifunctional information service of the RIS Centre Communications Platform. http://www.transnav.eu the International Journal on Marine Navigation and Safety of Sea Transportation Volume 11

Maritime Communications in RIS System for Inland Navigation

The article presents the VHF communications system architecture for inland navigation within the area of operation of the RIS-PL Centre. The author has described the communication system modules used in the RIS on the Lower Oder stretch and presented the relevant equipment specification. The present condition of the system has been described, taking into consideration the location of its components, both in the field and in the environment, of key importance for VHF communication. The feasibility of implementation of GMDSS subsystems for integrated navigational data transmission in maritime and inland navigation at the RIS-PL Centre has been discussed.