• Journal of the Korean Institute of Navigation
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• v.22 no.1
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• pp.1-13
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• 1998

Radiobeacons that carry corrections for global satellite navigation systems are currently being planned or installed in many countries. In early 1996, it was begun to send DGPS correction message from a marine radiobeacon station located in Changgi Got Lighthouse. It was the first test broadcast of DGPS correction data based on medium frequency of marine radiobeacon where transmission power and rate are 300W and 100bps respectively in Korea. However, there has not been any scientific study on the characteristic of the accuracy of a marine radiobeacon/DGPS. Accordingly, this paper investigates the accuracy of the system, which is currently operating in 310kHz. To do this , the real time differential correction in RTCM data was collected in an implemented system. And then the accuracy was analyzed related to the coverge of the radiobeacon/DGPS. As a result, it is verified that the differential positioning accuracy using the marine radiobeacon is sufficient to ensure the safety of marine activities around the coast of Korea.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1998.04a
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• pp.36-47
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• 1998

The test transimissionof DGPS correction data has been carried out since early 1996. The data has been sent from marine radiobeacon station at Changgi Gap Ligthouse. It was the first test brosdcast of DGPS correction data based on midium frequency of marine radiobeacon where transmission power and rate are 300W and 100bps respectively. However, there has not been any scientific study on the characteristic of the accuracy of a marine DGPS/radiobeacon. Accordingly. this paper investigates the accuracy of the system, which is currently operating in 310KHz. As a result , planned 8 reference station and coverage verified that the differential positioning accuray using themarine radiobeacon is sufficient to ensure the safetyof marine activities around the coast of Korea(position error of distance 107NM at reference station was about10m(drms)).

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.521-523
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• 2010

Reseatch and Analysis on the DGPS radiobeacon propagation measurement of Domestic ferry lines Starting with maritime DGPS Base stations of Palmido, Ochongdo which have been operated since 1999, truly our nation has become the most powerful country possessed with total of 17 DGNSS base stations in the field of DGNSS operation infrastructure. This paper intents to consider the development direction of the country's DGNSS services as identifying the services range of the maritime DGPS base stations in the south coast domestic ferry lines which sections are Busan$\rightarrow$Jeju, Jeju$\rightarrow$Nokdong.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1997.10a
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• pp.71-86
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• 1997

DGNSS(Differential GNSS) may be the most feasible positioning system to users who need the precise positioning in the future. A number of countries have carried out research and test about DGNSS based on the marine radiobeacon for improving positioning accuracy. This paper describes the status of DGNSS in the world and the system charactersitics. In special , DGNSS network of Korea to be constructed is discussed. And then DGNSS, which are operating for test, is analyzed by an experimental approach.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.4
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• pp.491-499
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• 2011

Starting with maritime DGPS base stations of Palmido, Ochongdo which have been operated since 1999, truly our nation has become the most powerful country possessed with total of 17 DGNSS base stations in the field of DGNSS operation infrastructure. This paper examines into the country's DGNSS services as measuring the service range of the maritime DGPS base stations in the domestic ferry lines which sections are from Jeju to Incheon, from Busan to Jeju, from Jeju to Nokdong, the propagation characteristics of the radio waves of 300 kHz bands on sea and land path. As a result of identifying the service range of the DGPS in the sea routes of the southern sea and the western sea, the measured results of the DGPS signals are confirmed more than 100 NM(recommended service range). It can be possible to practical use the position information, which is safe navigation and various marine traffic management systems. It will be useful an expansion of maritime DGPS reference station in the near future.

• Journal of the Korean Institute of Navigation
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• v.23 no.2
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• pp.51-60
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• 1999

The Japanese DGPS Data can be received easily in the area of the Korean peninsula and some Korean users may use these data. However, its analysis has not been actually investigated. This paper is a study on accuracy analysis of Japanese Marine Radiobeacon/ DGPS in the South Coast of Korea. The 3 Japanese DGPS stations, Wakamiya(295 kHz), Ose Saki(302 kHz) and Hamada(305 kHz), near the Korean peninsula were analyzed by several ways. It was concluded that the feasible result of the experimental study with an error range of no more 10 m in 2 DRMS.

• Journal of the Korean Institute of Navigation
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• v.24 no.3
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• pp.157-165
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• 2000

When the GPS system was come to the operation, the U.S Coast Guard initiated development of differential GPS system based on a marine radiobeacon. It has rapidly been spread out to many countries. DGPS equals to P(Y) code in a positioning accuracy. USA has recently determined to expand the coverage of DGPS to inland in order to install a nationwide DGPS chain. Korea is under processing for improving the DGPS as a nationwide positioning system. Before expanding the service area inside Korea, we need to verify the relation between the field strength and DGPS accuracy for the service area. The Japanese DGPS data is received in the southern Part of the Korean peninsula. The Korean DGPS was not a complete system, so we selected the Japanese DGPS data as a model for the study. This paper investigate accuracy and reliability characteristics of RBN/DGPS over the effective service area. Through the experimental and simulation study, we obtained the reliable and stable positioning accuracy in the southern part of the Korean peninsula. In addition, the characteristics of RBN/DGPS were examined in the land over the effective coverage from Japan. The results would be a basic reference to research the RBN/NDGPS in Korea.