• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.6
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• pp.815-822
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• 2011

In this paper, a design and implemented of the data communication system on the entails inherent safety with the distress and urgency of maritime data communication services that are required for functional limitations of the existing mounting equipment and services to determine the likelihood MF/HF, VHF, Inmarsat satellite communication has a diversification of the GMDSS ship communication equipment. Proposed role and direction of the GMDSS on the communication media by the communication cost, throughput, communication speed and processing services available, communication range, etc. by conducting a performance analysis and evaluation in the future maritime communications environment.

• Journal of Navigation and Port Research
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• v.45 no.1
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• pp.26-32
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• 2021

In ocean field, the spread of the Fourth Industrial Revolution based on information and communication technology requires high precision and stable PNT&D (Position, Navigation, Timing and Data). As the IMO (International Maritime Organization) and IALA (The International Association of Marine Aids to Navigation and Lighthouse Authorities) are requiring backup systems due to mitigate vulnerabilities and the increase of dependency on GNSS (Global Navigation Satellite System), Korea is conducting a research & development of R-Mode. An DGPS (Differentiate Global Positioning System) reference station that uses MF, an existing maritime infrastructure, and AIS (Automatic Identification System) base stations that use 34 integrity station and VHF will be utilized in this study to avoid redundant investment. Because there are radio shadow areas that display low signal levels in the west sea, the establishment of new R-Mode reference and integrity station will be intended to resolve problems regrading the radio shadow area. Because the frequency has a characteristic in that radio wave transmits well along the ground (water surface) in low frequency band, simulation and measurement were conducted therefore this paper to propose candidate sites for R-Mode reference and integrity station resulted through p wave's propagation characteristics analysis. Using this paper, R-Mode reference and integrity station can be established at appropriate locations to resolve radio shadow areas in other regions.