• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2023.11a
• /
• pp.116-118
• /
• 2023

In recent years, the need for economical and sustainable ship routing has emerged due to the enforced regulations on environmental issues. Despite the development of weather forecasting technology, maritime accidents by rough waves have continued to occur due to incorrect weather forecasts. In this study, onboard measurements are conducted to observe the acutal situation on merchant ships in operation encountering rough waves. The types of measured data include information related to navigation (Ship's position, speed, bearing, rudder angle) and engine (engine revolutions, power, shaft thrust, fuel consumption), weather conditions (wind, waves), and ship motions (roll, pitch, and yaw). These ship experiments was conducted to 28,000 DWT bulk carrier, 63,000 DWT bulk carrier, 20,000 TEU container ship, and 12,000 TEU container ship. The actual ship experiment of each ship is intended to acquire various types of data and utilize them for multi-objective studies related to ship operation. Additionally, in order to confirm the sea conditions, the directional wave spectrum was reproduced using a wave simulation model. Through data collection from ship experiments and wave simulations, various studies could be proceeding such as the measurement for accurate wave information by marine radar and analysis for cargo collapse accidents. In addition, it is expected to be utilized in various themes from the perspective of safety and efficiency in ship operation.

• Journal of Korean Society of Transportation
• /
• v.24 no.1 s.87
• /
• pp.85-94
• /
• 2006

Currently, when the military performs military operations in wartime and peace time, it is important for him to obtain repeatedly updated traffic information for security of the military supply support. The purpose of this study is to present an acquisition way of the repeatedly updated traffic information which the military is available. To achieve this Purpose, firstly, this paper finded types of traffic information which the military demanded and limitations caused by an connection of traffic information network between the military and associated government agencies. Also. grasped ITS(Intelligent Transportation systems) equipment operation by associated government agencies (Ministry Construction & Transportation, Korea Highway Corporation, Seoul Metropolitan Government, National Police Agency, Korea Institute of Construction Technology) and connection situations of traffic information network among associated government agencies. On the basis of these materials, this study presented the most efficient connection method in the field of the space and the contents of traffic information between the military and associated government agencies and ITS connection system between the military and associated government agencies was contrived. Throughout the upper processes, this paper showed a method which is available for acquiring ITS traffic information of associated government agencies. In addition to the connection method of ITS traffic information network, resolutions for the problems caused by connection of ITS network were come up with. But the more deep study for this matter is needed since resolutions for the problems of the ITS network connection, which this paper presented, were very restricted.

• Journal of Advanced Navigation Technology
• /
• v.17 no.6
• /
• pp.625-632
• /
• 2013

Since GBAS is a navaid facility to provide precision approach service to aircrafts landing at airports, it must be approved by the air navigation service provider or the aviation regulator to be declared operational. However, Korea has no experience in developing or operating the system so there is no approval criteria for GBAS. In order to develop the criteria in case of the future GBAS procurement, Korea Aerospace Research Institute has been testing the installed commercial GBAS station, SLS-4000, in Gimpo International Airport. This paper summarizes the criteria development results focusing on the system design approval. The criteria have been outlined based on the other leading nations' cases and documentations and established in detail on the basis of the FAA SDA artifacts. Those will be directly used for GBAS approval procedure in Korea and are expected to be useful in system requirement analysis, design, development and artifact management in case of own GNSS-based navaid system development in the future.

• Journal of Navigation and Port Research
• /
• v.34 no.3
• /
• pp.175-180
• /
• 2010

In the almost application parts, GNSS being used the primary navigation system on world-widely. However, some of nations attempt or deliberate to enhance current Loran system, as a backup to satellite navigation system because of the vulnerability to the disturbance signal. Loran interests in supplemental navigation system by the development and enhancement, which is called eLoran, and that consists of advancement of receiver and transmitter and of differential Loran in order to increase the accuracy of current Loran-C. A significant factor limiting the ranging accuracy of the eLoran signal is the ASF in the TOAs observed by the receiver. The ASF is mostly due to the fact that the ground-wave signal is likely to propagate over paths of varying conductivity and topography. This paper presents comparison results between the predicted ASF and the measured ASF in a southern east region of Korea. For predicting ASF, the Monteath model is used. Actual ASF is measured from the legacy Loran signal transmitted Pohang station in the GRI 9930 chain. The test results showed the repeatability of the measured ASF and the consistent characteristics between the predicted and the measured ASF values.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2011.06a
• /
• pp.27-28
• /
• 2011

A solar flares have the 11-year cycle and release a large energy which may produce coronal mass ejections (CME). The NOAA (National Oceanic and Atmospheric Administration) predicted that the sun spot activity will be maximized in 2013-2014. A strong solar flare can cause the disturbance of global positioning system including various communication of TV, radio broadcasting. The actual solar storm in 1989 caused power outages in Canada during 9 hours and about 600 million people had experienced a blackout. Such a solar storm can shorten the GPS satellite's life span about 5 to 10 years which can be resulted in economic loss considering the amount of multi-billion won. This paper analyzed the recent solar storm of X-class occurred on 15th of February about 10:45 this year that was reached Korea (Bohyun observatory) on 18th of February about 10:30 (local time), and compared with the data of before and after a week. The proton data of 18th of February considered that the solar strom reached on earth showed a fluctuation compared to the data of before and after a week. The positioning results at Daejeon also showed higher positioning error compared to the data of before and after a week results.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.41 no.1
• /
• pp.70-78
• /
• 2013

Before GBAS ground systems is installed at the airport, the site survey is needed to determine the suitability of proposed GBAS candidate sites depending on the siting requirements. Therefore, analysis of GPS signal reception environment, one of the site survey steps, is required. In this paper, the number of visible satellites, GPS signal strength, multipath error, radio frequency interference and predicted availability were analyzed using the GPS data of Gimpo International Airport measured by PortaSAT equipments and the analysis results were represented.

• Journal of Digital Convergence
• /
• v.18 no.6
• /
• pp.495-500
• /
• 2020

This study was intended to quantify the acceleration and deceleration information measured in the competition by using GPS device for the national women's field hockey players and to identify the difference in movement by classifying them by position. For this study, 308 acceleration and deceleration data were collected from 16 women's field hockey players measured at international competitions. According to research results, the frequency of acceleration was in the order of midfield > defender > striker, acceleration distance was midfield > striker > defender. The frequency of deceleration appeared in the order of midfield > defender > striker, deceleration distance was defender > striker > defender. Based on the results of this study, can be used as basic data when setting the strength and amount of training for field hockey players.

• Journal of Satellite, Information and Communications
• /
• v.9 no.3
• /
• pp.121-126
• /
• 2014

ETRI(Electronics and Telecommunication Research Institute) has joined National GNSS Research Center program of Defense Acquisition Program Administration and Agency for Defense Development in 2010. The research subject is technology for MSAR(Military Search and Rescue) system configuration. In this project, we analyses the ways in order to improve the accuracy, reliability, availability for MSAR system from M&S(Modeling and Simulation). The MSAR System M&S Software can be used for performance analysis of new elements, such as ground elements and satellite elements without any hardware development. In this paper, after introduction of the architecture design and functional scope of the simulator, the performance analysis result for MSAR M&S software is presented.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.20 no.9
• /
• pp.1696-1703
• /
• 2016

In this paper, it verifies site environment aspect that NDGPS (Nationwide Differential Global Positioning System) operated by MOF (Ministry of Oceans and Fisheries) will be used as the same site of reference stations for SBAS (Satellite Based Augmentation System). In order to prove this feasibility, we analyze the site environment requirements for SBAS reference stations, as well as we establish the procedure for the verification of the site environment requirements. With this procedure of the site environment survey, we perform site survey in the real field and analyze the results. We select interim candidate sites for survey which currently operating 17 NDGPS reference stations. This paper could be utilized in the process of selection or installation of reference stations in the field of GNSS(Global Navigation Satellite System) and the drawing the consideration which NDGPS reference stations will be co-operated as SBAS reference stations.

• 한국공간정보시스템학회:학술대회논문집
• /
• 2007.06a
• /
• pp.147-155
• /
• 2007

본 연구는 기술개발 자체의 효과성을 개발된 기술의 시장성, 확대 보급가능성, 민간분야의 기술 로드맵과의 관계성을 도출하는 것으로 실제로 업계에서 다양한 인맥과 프로젝트의 경험을 가지고 있는 자에 의한 심층인터뷰를 근거로 한 정성적 판단과 시장조사를 통한 정량적 판단을 결합하여 멀티센서의 기술개발의 가치를 평가하는 후속 조치에 해당되는 연구이다. 직접적 측면의 산업적 파급효과는 2006년에는 시범적인 수준에서 적용된 사례를 중심으로 정리해 본 결과, 다음과 같이 요약될 수 있다. 첫째, 전문화된 기업의 경우 각자의 강점에 기반을 두어 멀티센서의 적용시장을 바라보고 있다는 점이다. 모든 소프트웨어의 생산을 서버 부분부터 웹 버전, 모바일 버전까지 모두 보유하고 있는 벡터 부분의 GIS 수준과는 달리 위성영상 및 멀티센서 분야의 소프트웨어는 대용량으로 인한 한계로, 서버중심, 웹 중심의 개발이 이루어지고 있으나 모바일 분야까지 확장되지는 않고, 차량항법장치와의 연계를 통한 확장을 꾀하는 수준이라고 요약할 수 있다. 둘째, 전문기업이 아닌 대기업의 시장분석 및 전략에 관한 부분을 요약하자면, 멀티센서와 직접적인 연관을 갖는 회사는 많지 않으나 대체로 U-city 사업 발굴 시 멀티센서가 융합기술이 요소기술로서 기여할 수 있을 것이라는 기대는 하고 있으며, 규모도 1,000억 원 대를 상회할 것으로 바라보고 있다. 셋째, 멀티센서 개발기술의 상용화 및 산업화를 위한 제거 요소 및 감소 요소, 증가 요소 및 새로이 만들어야 할 요소 등을 다차원 전략으로 제시하였으나, 전략을 구사할 기관이 산재되어 있어 제도적 차원의 뒷받침이 기술개발과 더불어 진행되어야 한다는 결론에 이르게 된다. 넷째, 개발된 4개의 기술에 대하여 KVA에서 산출한 기업평가 방식을 변형하여 적용하였는데, 위성영상과 DEM 개발기술이 87% 이상의 점수를 받아 가장 시장성 및 활용성이 높은 기술로 평가되었으며, 초다분광영상에 대한 기술은 70%를 겨우 넘는 수준에서 평가가 되었다. 멀티센서 공간영상정보 통합처리 기술 개발은 다목적 실용위성의 보유, 국가 NGIS 사업의 결과물이 상당히 축척이 되어 있고, 라이다(LiDAR) 기술의 도입을 위한 환경이 조성되었기에 다른 국가에 비해 멀티센서 기술의 적용과 산업화가 가시화 될 수 있을 것으로 기대된다. 그러나 멀티센서 자료의 수급이 용이하지 못하고, 법 제도적인 한계, 시장의 성숙도가 기대이하라는 점 등의 한계를 노정하고 있다.