• Journal of Navigation and Port Research
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• v.26 no.1
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• pp.28-34
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• 2002

Irregular reflected signals on a sea surface make clutters to a ship's radar image. Clutters are similar to Gaussian white noises which are very harmful for detecting objecting at sea by a ship's radar. To remove the clutter effects, many papers show the algorithms by antenna, filters, and so on. This paper shows a new algorithm which uwes Wavelet and Morphology median filter conceps for removing clutter and enhancing image in order to detect well a distressed of being rescued ship in a rough weather condition at sea.

• Journal of Navigation and Port Research
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• v.30 no.5 s.111
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• pp.357-362
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• 2006

This paper describes two kinds of personal hand-held electronic devices to enhance marine leisure safety. The one is Radar response-type safety device triggering by the pulse signal from a commercial 9GHz-band Radar to provide quick search and rescue with combined civilian-government-military fleets. The other one is M-RFID (Marine Radio Frequency IDentification) based safety electronic device using 900MHz Tx/Rx with spread spectrum frequency hopping and GPS. Through the field tests at sea using Korea Coast Guard's warship the operating performances are verified. Further plan for practical use of each device was also discussed.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.321-322
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• 2022

In this study, the marine environment is measured and analyzed in real time through the X-band radar installed on the rooftop of the Sokcho Beach administrative Welfare Center and Ulleungdo. Afterwards, the goal is to transmit the analysis results to the client PC. Using electronic maps and electronic navigational charts, the measurement results are overlaid on GIS (spatial information system), real-time data are shared through a website, and information is displayed through a web server. Currently, CCTV information and marine environment information are displayed on the website, but various application studies such as the use of Open AP I will be conducted in the future.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.10a
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• pp.186-189
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• 2010

선박의 대형화와 고속화 및 늘어나는 해상 뮬동량으로 인해 해상에서 대형사고의 위험이 증가하고 있다. 해난사고의 위험을 억제하고 선박의 안전과 해상환경의 보호를 강화하기 위해 기존 레이더 위주의 관제시스템을 국제적 e-Navigation기반의 다양한 항행정보지원 및 최신 유비쿼터스 기반의 센싱 장비들에 의한 기술과의 융합을 통하여 보다 지능화되고 첨단화된 차세대 해상교통관제시스템(u-VTS)의 도입이 필요하게 되었다. 국제표준에 부합하는 차세대 해상교통관제시스템(u-VTS)을 개발하기 위해서 국제동향의 분석이 필수이며, 이 연구에서는 VTS 관련 국제회의에서 현재 논의 중인 내용을 소개하고 상용화될 기술에 대하여 조사했으며, u-VTS에서 제공되어야 할 서비스를 도출했다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.05a
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• pp.237-239
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• 2018

선박관제용 VTS시스템은 레이더, 선박자동식별장치(AIS) 등을 이용하여 정보를 수집하여 관제정보가 필요한 선박국에게 초단파무선통신(VHF)를 통하여 전달한다. 레이더와 선박자동식별장치(AIS) 등은 장비를 이중화하여 안정적인 운영을 할 수 있지만, 관제장비에서 가장 중요한 역할을 담당하는 초단파무선통신(VHF)는 장비만을 이중화하는 것으로 부족한 이유는 바로 주로 선박국이나 육상국에서 일어나고 있는 KEYING현상 때문이다. 최근 제주, 목포, 완도, 여수연안 VTS 등에서 동시 발생한 VHF KEYING 현상을 분석하여 효율적인 대응 방안을 제시하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.06a
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• pp.17-18
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• 2009

현재 우리나라의 연안해상교통관제는 연안해역의 관제, 수색 및 구조지원, 선박통항관제 수단을 제공하고 하기 위해 AIS(Automatic Identification System)와 레이더 시스템을 활용하고 있다. 하지만 AIS의 경우 고가의 장비로 소형선박에 설치가 용이하지 않은 실정이며 레이더를 활용한 소형선박 관제 시 Target Swapping 현상과 거리와 크기에 의한 탐지성능 변화 등의 문제점으로 소형선박의 위치를 제대로 파악하지 못하여 사고발생의 큰 비중을 차지하고 있어 방지대책이 필요한 실정이다. 이러한 문제를 해결할 수 있는 방안으로서 본 연구에서는 IP-RFID 기술을 활용한 연안해상교통관제시스템의 적용방안을 제시하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.4
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• pp.359-364
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• 2013

In this paper, we propose a direct sequence ultra wideband (DS-UWB) radar system based on correlation accumulation in the fields of the ship traffic control and the safe ship operation including docking guidance systems. The proposed DS-UWB radar system averages out the noise by accumulating correlator outputs, and thus, provides a reliable distance estimation performance with a shorter estimation time compared with conventional DS-UWB radar systems. From numerical results, it is confirmed that the proposed DS-UWB radar system has not only a shorter average correlation processing time, but also a better distance estimation performance.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.71-72
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• 2001

최근 연근해 어선에서는 소형 레이더 장치를 항해 및 어로장치와 함께 탑재하고 있으나, 소형 레이더에 있어서는 타선의 진운동정보(진침로, 진속력)나 충돌회피정보(CPA, TCPA), 또한, 주위의 상황변화에 대한 다양한 물표정보(진운동벡터표시, 실시간 추적정보)를 제공할 수 없는 문제가 있다. (중략)

• Journal of Navigation and Port Research
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• v.41 no.4
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• pp.189-194
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• 2017

The Moving Search Radar System (MSRS) monitors sea areas by moving along the coast. Since the radar is initially aligned to the front of the vehicle, it is important to know the changes in the heading azimuth of the vehicle to quickly acquire the target azimuth from the radar after the MSRS has moved. The heading azimuth can be obtained using the gyro compass, the GPS compass or the electronic compass. The electronic compass is suitable for MSRS requiring fast maneuverability due to its small volume, short stabilization time and low price. However, using a geomagnetic sensor may result in an error due to the surrounding magnetic field. Errors can make early automatic tracking of the satellites difficult and can reduce the radar detection accuracy. Therefore, this paper proposes a method to automatically compensate for the error reflecting the correction value on the radar obtained by comparing the reference azimuth calculated by solving the geodesic inverse problem using two coordinates between the radar and the geostationary satellite with the actually-directed azimuth angle of the satellite antenna. The feasibility and convenience of the proposed method were verified by applying it to the MSRS in the field.

• Journal of Navigation and Port Research
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• v.27 no.5
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• pp.499-504
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• 2003

This paper describes the system for evaluating the sea wave informations such as wave direction and wave length in real time, by using image data obtained from the marine X-band radar. We proposed here a method for automatic selection of the partial image data without the user's individual selection at the radar. We also discussed that the wave direction could be obtained by a 2-dimensional discrete Fourier transform algorithm. We carried some evaluation works on the algorithm through computer simulation. The obtained thirteen radar image data under several sea surface conditions were analyzed by the method described and the result was presented.