Abstract
Abstract In the maritime Very High Frequency (VHF) band, there are no systems for transmitting large amounts of data. Therefore, it is necessary to develop new systems that would modernize the Global Maritime Distress and Safety System (GMDSS), significantly relieve the Automatic Identification System’s (AIS) communication channels, and set guidelines for the development of communication infrastructure of the e-Navigation. In line with this, analytical and simulation models of the maritime VHF data transmission communication system using Orthogonal Frequency Division Multiplexing (OFDM) modulation are worked out in this paper. The achieved data rate, the spectral efficiency and the bit error rate (BER) represent validation parameters on which the results of the analytical and simulation models are evaluated. It is concluded that the application of the digital OFDM modulation in the maritime VHF band may improve the GMDSS system by achieving higher data rates compared to the current terrestrial mandatory systems for data exchange, i.e. Digital Selective Calling (DSC) and AIS.
Highlights
The Inmarsat satellite communication system provides with more ways of communication in relation to maritime terrestrial communications
The conversion of the signal to the maritime Very High Frequency (VHF) frequency range is not required because the relevant features can be processed and analyzed in the baseband frequency range, if the impacts within the VHF communication channels are taken into account [8], [16], [27]
The purpose of this research was to perform a systematic analysis of the maritime VHF communication system using a digital Orthogonal Frequency Division Multiplexing (OFDM) modulation
Summary
The Inmarsat satellite communication system provides with more ways of communication in relation to maritime terrestrial communications. It enables digital voice communications, exchange of large amounts of data, as well as the Internet Protocol (IP) connection. These features, as well as the ease of operation, are the main reasons for the more frequent use of Inmarsat devices on board ships in comparison to the terrestrial communication devices, resulting in the non-utilization of a large portion of the frequency spectrum allocated for terrestrial communications. The AIS is often used to send other data, such as Aids to Navigation (AtoN), Application Specific Messages (ASM), Search and Rescue Transmitter AIS (SART-AIS), Man Overboard Unit (MOB) and Emergency Position-Indicating Radio Beacon AIS (EPIRB-AIS)
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