• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.10
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• pp.2059-2064
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• 2011

The DGPS systems that is a GPS augmentation system were installed for ocean- and land-service. The ocean-based reference station of 11 site and the land-based reference station of 6 sites are operating for ocean- and land-service. Although the land-based reference stations provide the output power of 500W, the service shadow regions are occurred due to mountain lands and building area. In this paper, the service coverages for land-based reference stations are analyzed in conditions of output power enhancements of reference station. The service shadow areas are deduced from service coverages of land-based reference stations and ocean-based reference stations. The medium frequency-band wave propagation models are considered as DGPS wave propagation model. The service coverages are analyzed by considering the compensated ground surface-conductivity.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.7
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• pp.1350-1357
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• 2012

Korean NDGPS, which consists of the ocean-based reference station of 11 site and the land-based reference station of 6 sites, are operating. The land-based reference stations provide the output power of 500W, the service shadow regions are occurred due to mountains and nation topography. In this paper, the service coverages of land-based reference stations are analyzed in the viewpoint of output power enhancements of land-based reference stations within 1KW. Also, we suggest virtual land DGPS reference stations 2 sites to resolve the service shadow regions.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.10a
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• pp.288-290
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• 2015

GNSS 현대화 사업 추진과정의 배경 및 근거를 제시하고 진행된 해양기준국의 사업과 진행중인 감시국 현대화 사업을 통해 내륙기준국의 현대화 사업계획을 모색하고 더 나은 무결성 측위정보 제공을 위한 국립해양측위정보원에서 하는 일에 대한 발표.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.585-588
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• 2011

현 시점 우리나라는 1999년부터 해안 DGPS(Differential Global Positioning System) 기준국을 기반으로 하여 2009년까지 해안기준국(11곳), 내륙기준국(6곳)으로 전국 17개소의 DGPS 기준국을 설치 및 운용하고 있으며, 전국적으로 DGPS 서비스를 해상 및 육상에서도 다양한 분야에 걸쳐 실시간으로 서비스가 진행되고 있다. 그러나, 우리나라의 지형상 산악지형이나 여러 가지 요인에 의한 서비스 음영지역이 발생하고 있는 실정이다. 따라서, 본 논문에서는 실측데이터를 이용하여 내륙기준국에서의 지점경로 전파분석을 통하여 기준국 안테나 파라미터를 알아보고 서비스 음영지역 도출 및 나타나는 음영지역 해소 방안으로 안테나 효율 및 기준국의 송신 출력을 검토하여 그에 대한 방안을 모색하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2021.11a
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• pp.37-38
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• 2021

해상에서의 통신은 파도의 움직임에 의해 내륙에서의 통신에 비해 어려움이 있다. 본 논문에서는 Bretschneider 스펙트럼 모델을 이용하여 Open-Ocean에서의 파도의 움직임을 모델링다. 내륙에 위치한 기지국과 내륙으로부터 일정 거리 떨어진 해상에 위치한 부표와의 해상통신 환경을 고려하였으며, 모델링한 파도의 움직임을 바탕으로 부표부터 기지국까지의 거리에 대한 각도와 기지국부터 Block되어 Non-Line of Site(NLoS)된 지점까지의 거리에 대한 각도를 비교함으로써 Continuous-LoS(CLoS)구간을 확보하기 위해 파고 대비 안테나의 높이를 변경하며 비교했다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.06a
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• pp.55-59
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• 2009

In a base on the MDGPS base station which has been operated since 1999; our country has completed the construction of six Land Base Stations to use of NDGPS in land from starting Mu-Ju base station in 2002 to Chun Cheon base station which is going to be operated on July 2009. Accordingly, with the exception of the Chun-Cheon base station because it is being built now, we will consider a better direction of improvement in service for land base station after surveying and analyzing on the signal characteristic of land base station.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.6
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• pp.1255-1261
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• 2014

Based on the radio wave measurement of korean ocean-based DGPS by season, in this paper, the service coverages of ocean-based DGPS reference stations were analyzed according to the climate and season. The signal strengths and signal-to-noise ratios in the land service areas that are provided by ocean-based DGPS reference stations were measured. The ocean-based DGPS reference station except reference stations on the mountainous terrain and the low ground conductivity provide more than 68% service area in comparison with the designed land service coverage providing by the ocean-based DGPS reference stations. To provide the designed service area that is unrelated to a season, it is necessary to install and operate the DGPS reference station with good ground conductivity and high efficiency antenna. Also, the poor service regions which is generated by obstacles of electric wave on pathway can be resolved by the double service area providing by land-based DGPS reference stations.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.153-156
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• 2006

국제해사기구(IMO) 권고에 따라 도입된 우리나라의 해양용 DGPS 기준국 구축과 국무총리 훈령에 의거 추진 중인 내륙용 DGPS 기준국의 운영현황 등을 기술하고 DGPS 기준국과 GPS 상시관측소간의 서로 다른 제원에 따른 후처리데이터의 신뢰도 품질체크를 TEQC 프로그램을 통해 비교 ${\cdot}$ 분석했다.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.4
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• pp.437-443
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• 2014

Based on the radio wave propagation measurement of DGPS land-based reference stations, the DGPS service coverage and signal quality in the receiving points are analyzed in this paper. The DGPS signal strength and SNR in the receiving point are measured in the winter and summer season, respectively. In case of DGPS reference station that can not provide the designed service coverage, the solution to improve the service coverage is presented in this paper. Almost all DGPS reference station except reference station with low ground conductivity or mountainous terrain provide the DGPS service coverages of 80% or more of the designed service area. The service coverages of DGPS reference stations can be improved to pre-designed service area in case of installation management of DGPS site on the plain terrain and good ground conductivity. It is necessary to get the high efficiency of transmitting antenna to improve the service area.

• Journal of Korea Port Economic Association
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• v.27 no.4
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• pp.271-289
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• 2011

Mongolia as a land-locked country, has tried to diversify its foreign trade with European and Asian countries. Recently continual price rise of mineral resources also helps Mongolia have chances to gain her trading partners. Nevertheless, regulations and barriers to exports of Mongolian mineral resources in China and Russia, which are transit countries, are complex and complicated in border crossing and transshipment procedures for transit transport. This paper discusses problems and barriers to economic and efficient logistics systems and transit transport of Mongolian mineral resources, and addresses a proposal of international intermodal transport corridors for improving transit transport, and suggests international cooperation, by applying transit rights of land-locked country. Specifically, it is necessary for Mongolia to search for other international intermodal corridors besides the corridor through the port of Tianjin. It is needed to build an international organization for discussion of affirmation of logistics equipments and improvement of transit procedure in border crossing, and to raise financial feasibility in building a new intermodal corridor.